KR101377279B1 - Method for adding binder, device for adding binder, kneading machine and kneading method - Google Patents

Abstract

SUMMARY OF THE INVENTION An object of the present invention is to provide a binder addition method and an addition apparatus that can uniformly add a binder to an iron ore raw material and can control the concentration and amount of the binder quickly and accurately in the granulation of the iron ore raw material. do.
The binder addition method of this invention uses the mixing nozzle 70 which mixes the binder and water which are individually supplied by the binder supply piping 63 and the water supply piping 66, and the raw material input part 55 of the kneading machine 50. ), And the binder aqueous solution in which the binder and water are mixed from the mixing nozzle 70 is sprayed with respect to the iron ore raw material introduced into the raw material input unit 55 of the kneader 50.

Description

Binder addition method, binder addition apparatus, kneading machine and kneading method {METHOD FOR ADDING BINDER, DEVICE FOR ADDING BINDER, KNEADING MACHINE AND KNEADING METHOD}

The present invention relates to a binder addition method, a binder addition device, a kneader, and a kneading method capable of uniformly adding a binder to an iron ore raw material and capable of quickly and accurately controlling the concentration and the amount of the binder.

In the granulation of the iron ore raw material, the binder raw solution (also referred to as granulation agent) and water-adjusted water (hereinafter referred to as addition water) are added to the iron ore raw material and kneaded and granulated. In the granulation step, it is important to control the amount of binder and the amount of addition, that is, the concentration and amount of the binder aqueous solution with high accuracy and speed, and to add the binder aqueous solution uniformly to the iron ore raw material in order to improve the quality of the granulated product.

For example, Patent Document 1 proposes a method of uniformly dispersing water in an entire raw material by spraying the binder and water with different watering means in granulators such as a drum mixer in assembling the sintered raw material containing iron ore. have.

In the case of assembling the iron ore raw material containing up to 250 µm fine powder from granulation having a particle diameter of about several millimeters, the fine particles in the raw material are properly dispersed by a binder functioning as a dispersant, and the core particles It is important to adhere the fine powder to the surface of the assembly. Therefore, when assembling the iron ore raw material mainly composed of such fine powder, in order to improve the quality of the granulated material, a kneader for kneading the iron ore raw material is provided at the front end of the granulator as a preliminary step of manufacturing the granulated product by the granulator. In this case, it is necessary to uniformly add the binder aqueous solution adjusted to a predetermined concentration to the iron ore raw material and sufficiently knead it.

Patent Document 2 discloses that when assembling an iron ore raw material mainly composed of fine powder, in order to obtain a target particle size distribution, first, an iron ore raw material containing 60 mass% or more of particles having a particle size of 250 μm or less is kneaded with a kneader, and the average particle size is 3 mm. A method of producing a kneaded product of 7 mm or more and more, followed by granulating the kneaded product with a drum mixer (assembling machine) and producing a granulated product having a particle size of 3 mm or more and 10 mm or less.

Usually, when adding a binder aqueous solution in a kneader, for example, as described in the said patent document 2, binder and water are supplied from the body part of a blade rotary kneader, and a binder aqueous solution is added in the said kneader. The method to do is adopted.

In addition, Patent Document 3 proposes a method of mixing the granulating agent and the additive water in advance, and spraying the mixed solution into the granulator to mix the iron ore raw material in order to uniformly mix the granulating agent in the iron ore raw material in the granulator.

Patent Document 1 Japanese Unexamined Patent Publication No. 2007-113087 Patent Document 2 Japanese Unexamined Patent Publication No. 2007-247020 Patent Document 3 Japanese Unexamined Patent Publication No. 2004-137595 Patent Document 4 Japanese Patent Application No. 2003-515440

However, in the binder addition method described in the patent document 2, as shown in Fig. 1, since there is a gap between the inner peripheral surface of the body portion 2 of the blade kneader 1 and the stirring blade 3, A raw material adheres to the inner peripheral surface of the body part 2, and the fixing layer 4 (namely, the self-lining layer of a raw material) is formed. For this reason, since the binder aqueous solution 7 sprayed from the addition nozzle 6 through the piping 5 connected to the body part 2 is disturbed by the said fixing layer 4, it is not sprayed directly on the raw material in kneading | mixing. Instead, it flows down along the inner circumferential surface of the body portion 2 and enters into the gap between the fixing layers 4 and is added locally to the raw material. In this case, it is difficult to uniformly add the binder aqueous solution 7 within a predetermined time during which the raw material stays in the kneader 1, and since the binder is ubiquitous in the raw material, a shade occurs in the binder concentration, which is suitable for the granulation conditions. You can not get kneaded material.

In addition, although the residence time of the raw material in a kneader can be calculated | required by the input amount and the deposition amount of the raw material in a kneader, in view of apparatus size, it is difficult to make this residence time extremely long and it is usually about 3 minutes long. It is often short time. For this reason, since it is necessary to uniformly mix the binder aqueous solution of uniform density | concentration in such a short time to the whole raw material, when adding a binder aqueous solution in a kneading machine, it is necessary to control the said binder aqueous solution to a prescribed density | concentration.

As a method for securing the prescribed binder concentration from such a viewpoint, for example, the configuration of a granulating agent adding device to a granulator described in Patent Document 3 is applied to the addition of an aqueous binder solution to a kneader, as shown in FIG. 2, By the static mixer 10 provided in the position away from the position (henceforth an addition position) of the addition nozzle 6 of the kneader 1, the binder raw liquid and addition water are mixed, and binder aqueous solution is carried out by one piping ( By 5), the method of conveying to the addition position of the kneader 1 can be considered.

In this method, the flow rate of the binder raw liquid which flows through the piping 13 is controlled using the flow control valve 11 and the electromagnetic flowmeter 12, and the flow control valve 14 and the electromagnetic flowmeter 15 are used, for example. By controlling the flow rate of the added water flowing through the pipe 16, the two are mixed with the static mixer 10 to produce a binder aqueous solution of a predetermined concentration, and the binder aqueous solution is mixed into one pipe 5 by the kneader 1 ) Can be supplied.

By the way, iron ore raw materials are often stored outdoors, and the moisture (hereinafter referred to as raw material moisture) contained in iron ore raw materials frequently changes due to the influence of climate. In addition, the compounding ratio of plural kinds of iron ore raw materials is often changed, and the raw material moisture also changes depending on the compounding ratio. Because of these causes, the moisture of the iron ore raw material introduced into the kneader 1 frequently fluctuates, and thus is not stable. For this reason, even if the static mixer 10 produces | generates the binder aqueous solution of a defined concentration, and adds it in the kneading machine 1, the binder concentration actually acting on a raw material changes with raw material moisture. Therefore, it is always required to control the binder concentration and the addition amount of the binder aqueous solution with high precision according to the moisture content of a raw material. In other words, the concentration and the amount of the aqueous binder solution need to be controlled with high precision in both the mass of the solid, the mass of the solid in the binder stock solution, the mass of the water in the binder stock solution and the sum of the mass of the added water in accordance with the change of the raw material moisture. have.

However, in the method using the static mixer 10 of FIG. 2 described above, since the binder aqueous solution mixed by the static mixer 10 remains in the pipe 5 before the raw material moisture is changed, the pipe ( Even if the flow rates of 13 and 16 were controlled, it was difficult to control the concentration and the amount of the binder added to the raw material with high accuracy.

For example, as will be described later, when the raw material moisture introduced into the kneader 1 decreases, the concentration of the binder aqueous solution remaining in the pipe 5 is higher than the optimum condition for the raw material moisture after the reduction. That is, when the water content of the raw material decreases, it is necessary to increase the amount of added water relatively. Therefore, the concentration of the binder aqueous solution itself must be lowered as compared with before the material water decreases, but the binder aqueous solution remaining in the pipe 5 is adjusted. The binder concentration remains high. For this reason, when this residual binder aqueous solution is added to the raw material, the binder concentration becomes too high during kneading by the kneader 1, and the kneaded product becomes a sticky clay state and cannot be assembled (hereinafter referred to as slurry state). It becomes). On the other hand, when the raw material moisture rises, the concentration of the binder aqueous solution remaining in the pipe 5 is lower than the optimum conditions for the raw material moisture after the rise. For this reason, binder density | concentration becomes low too much at the time of kneading, and sufficient granulation particle size and strength will not be obtained.

In particular, when the kneaded product is in a slurry state because the binder concentration is too high, the conveyance itself from the kneader to the granulator may not be possible, and a serious problem of stopping the production line occurs. In the example experienced by the inventors of the present invention, even when the raw material moisture value decreases by only 0.5% by mass, the raw material to be taken out from the kneader 1 becomes a slurry, and subsequent conveyance cannot be carried out. There have been many times when we have no choice but to take out our hands. In this way, the control delay of the binder concentration caused by the binder aqueous solution remaining in the pipe 5 on the downstream side of the static mixer 10 becomes an important problem.

In order to cope with such a problem, as shown in FIG. 3, the binder stock solution and the added water are respectively conveyed to different pipes 13 and 16, and the static mixer is approached to the immediate vicinity of the addition position of the kneader 1. You can think of However, also in this method of FIG. 3, in order to change the amount of binder stock solution and the amount of additions which are mixed by the static mixer 10, the binder stock solution and the number of additions which were conveyed at predetermined pressure in the piping 13 and 16, respectively. Since the pressure balance of both interferes with each other in the static mixer 10, there is a problem that it takes time to normalize. For this reason, in the method using the static mixer 10 shown to FIG. 2 and FIG. 3, even when the raw material moisture changes only 0.5 mass%, flow volume adjustment is not immediately performed and time delay until it stabilizes by control flow volume. Since this occurred, there was a fear that a serious problem as described above would occur. As described above, in the method using the static mixer 10, which is considered essential to obtain a binder aqueous solution having a prescribed concentration, the response to the change in the binder concentration due to the change in the moisture of the raw material is poor, so that the concentration of the binder added to the raw material and It was very difficult to control the amount of addition quickly and accurately.

In view of the circumstances described above, in order to improve the assemblability in the granulation step in the past, in the kneading step of kneading the iron ore raw material mainly composed of fine powder, a binder can be added uniformly to the raw material, and it changes every moment. According to the raw material conveyance amount and raw material moisture which were mentioned, the method which can control the density | concentration and addition amount of the binder added quickly with high precision was desired.

 Accordingly, the present invention has been made in view of the above problems, and an object of the present invention is to provide a binder that can be added uniformly to iron ore raw materials, and to control the concentration and amount of the binder quickly and with high accuracy. And an improved binder addition method, a binder addition device, a kneader and a kneading method.

MEANS TO SOLVE THE PROBLEM In order to solve the said subject, as a result of earnestly examining, the present inventors mixed a binder and addition water with the mixing nozzle with which the exit side was released, and sprayed the raw material injected into the raw material input part of a kneader, It has been found that the addition amount and the binder concentration can be controlled quickly and uniformly mixed with the steelmaking raw materials without changing the pressure balance between the excess water and the added water, and rapidly controlling the addition amount and the binder concentration with respect to the water change of the iron ore raw materials.

In addition, in order to uniformly mix the high viscosity binder and the additive water, it was found that the uniformly mixed binder aqueous solution can be obtained by impinging the sprayed additive water on the binder.

This invention is made | formed in view of such a knowledge comprehensively, and the summary is as follows.

According to an aspect of the present invention, in the assembling of the iron ore raw material, the binder and the water which are individually supplied by the binder supply pipe and the water supply pipe are mixed, and the mixing nozzle having the exit side freed is used for the kneading machine of the iron ore raw material. A binder addition method is provided in the vicinity of a raw material input unit, and the binder aqueous solution in which the binder and the water are mixed from the mixing nozzle is sprayed on the iron ore raw material introduced into the raw material input unit of the kneader.

Further, in order to solve the above problems, according to another aspect of the present invention, in the assembling of the iron ore raw material, the binder supply pipe for supplying the binder and the water supply pipe for supplying water are the raw material input portion of the kneader of the iron ore raw material. And a mixing nozzle which is installed in the vicinity and which has the outlet side open at the same time as mixing the binder and the water separately supplied by the binder supply pipe and the water supply pipe, and the mixing nozzle is configured to separate the binder and the water. A binder addition device is provided, wherein the aqueous binder solution produced by mixing is sprayed onto the iron ore raw material introduced into the raw material input portion of the kneader.

Moreover, in order to solve the said subject, according to another viewpoint of this invention, the kneading machine provided with the said binder addition apparatus is provided.

Moreover, in order to solve the said subject, according to another viewpoint of this invention, using the said binder addition apparatus, while spraying aqueous solution of a binder with respect to iron ore raw material thrown in the raw material input part of a kneading machine, There is provided a kneading method characterized by kneading iron ore raw materials.

Moreover, the said mixing nozzle is a dual structure which consists of an external nozzle and the internal nozzle provided in the said external nozzle, The said binder supply piping is connected to either the said external nozzle or the said internal nozzle, and said water A supply pipe is connected to the said outer nozzle or the other of the said inner nozzle, and sprays the said water supplied by the said water supply piping with respect to the said binder supplied in the said outer nozzle by the said binder supply piping, The binder and the water may be mixed in the outer nozzle to generate the binder aqueous solution, and the binder aqueous solution may be sprayed onto the iron ore raw material from the nozzle mouth of the outer nozzle.

The binder supply pipe is connected to an inlet formed through a side surface of the outer nozzle, and the water supply pipe is connected to communicate with the inner nozzle, and the binder discharged into the outer nozzle from the inlet of the outer nozzle. In contrast, by spraying the water from the nozzle port of the inner nozzle, the water may be mixed with the binder to generate the binder aqueous solution.

In addition, the water supply pipe is connected to an opening formed through a side surface of the outer nozzle, and the binder supply pipe is connected to communicate with the inner nozzle, and the binder discharged into the outer nozzle from the nozzle port of the inner nozzle. In contrast, by spraying the water from the opening of the outer nozzle, the water may be mixed with the binder to generate the binder aqueous solution.

The binder may be a polyacrylic acid-based dispersant. In addition, the viscosity of the binder stock solution is preferably 5000 mPa · s or less.

The flow rate of at least one of the binder supply pipe or the water supply pipe may be controlled according to the water contained in the iron ore raw material or the amount of the iron ore raw material input to the kneader.

The iron ore raw material may contain fine powder and nuclear particles which are kneaded by the kneader and then granulated by a granulator, and the binder may be a dispersant for dispersing the fine powder in the iron ore raw material.

According to the above constitution, the supply amount of the binder and the water is provided by installing the mixing nozzle near the raw material inlet of the kneader and conveying the binder and the water to separate mixing pipes in the addition position (near the raw material inlet), respectively. High precision can be controlled.

In addition, the mixing nozzle is mixed with the binder and the water supplied by the binder supply pipe and the water supply pipe and water to produce a binder aqueous solution, the binder aqueous solution is sprayed on the iron ore raw material to be introduced into the raw material input of the kneader. Thereby, before the iron ore raw material is introduced into the kneader, a binder aqueous solution having a uniform concentration can be added to the iron ore raw material uniformly. In addition, since the mixing nozzle mixes the binder and water under the open pressure, the concentration of the binder aqueous solution can be changed quickly, and the binder aqueous solution of the concentration after the change is immediately prepared by placing the mixing nozzle near the raw material inlet. Can be added to. Therefore, the concentration and the amount of the aqueous binder solution can be quickly and precisely changed to appropriate values, respectively, and added to the iron ore raw material in accordance with the fluctuations in the moisture or raw material input amount of the iron ore raw material.

As described above, according to the present invention, the binder can be added uniformly to the iron ore raw material, and the concentration and the amount of the binder can be controlled quickly and with high accuracy.

BRIEF DESCRIPTION OF THE DRAWINGS It is explanatory drawing which shows the fixing layer adhered to the inner peripheral surface of the trunk | drum of the conventional blade rotary kneader.
It is a schematic diagram which shows the binder addition method using a static mixer.
It is a schematic diagram which shows the example of a change of the binder addition method using a static mixer.
It is a schematic diagram which shows the sintering apparatus provided with the kneading machine which concerns on 1st Embodiment of this invention.
It is a schematic diagram which shows the kneader equipped with the binder addition apparatus which concerns on the same embodiment.
It is a schematic diagram which shows the mixing nozzle of the binder addition apparatus which concerns on the same embodiment.
It is a schematic diagram which shows the mixing nozzle of the binder addition apparatus which concerns on the modification of the same embodiment.

EMBODIMENT OF THE INVENTION Below, the preferred embodiment of this invention is described in detail, referring an accompanying drawing. In addition, in this specification and drawing, duplication description is abbreviate | omitted by attaching | subjecting the same code | symbol about the component which has substantially the same functional structure.

[1.Overall Configuration of Sintering Equipment]

First, with reference to FIG. 4, the whole structure of the sintering apparatus to which the kneader equipped with the binder addition apparatus which concerns on 1st Embodiment of this invention was applied is demonstrated. It is a schematic diagram which shows the whole structure of the sintering apparatus to which the kneader equipped with the binder addition apparatus which concerns on this embodiment was applied.

As shown in FIG. 4, the sintering installation which concerns on this embodiment mainly comprises the pseudo granulation line 20, the pellet granulation line 30, and the sintering machine 40. As shown in FIG. The pellet granulation line 30 is a production line for producing granulated material (hereinafter referred to as sintered raw material pellets) in which iron ore raw materials mainly composed of fine powder are assembled. On the other hand, the pseudo assembly line 20 is a production line for assembling the iron ore raw material containing fine powder and granulation, and manufacturing granulated material (hereinafter referred to as "pseudo granulated product") to which fine powder is attached to granules which become nuclear particles. .

Here, the iron ore raw material for manufacturing the said sinter raw material pellets and a pseudo granulated material is demonstrated first. The iron ore raw material is used as a sintering raw material for producing sintered light with the sintering machine 40. This sintered raw material is, for example, one or two kinds of iron ore raw material, which is the main raw material, such as steelmaking dust (blast furnace dust collecting, converter dust, etc.), pellet feed, limestone, dolomite, silica, olivine, coke powder, anthracite, etc. The mixed raw material which added the above can be used. As the iron ore raw material, any kind can be used as long as it is an iron ore used as a normal sintering raw material. For example, iron ore (eg, goethite or brown iron ore) ) Or may be a porous one (for example, maraman ore, deceased blockman ore, etc.).

Since the said iron ore raw material contains many fine powders, granulation property is bad, the intensity | strength of a granulated material becomes weak, and a granulated material collapses in the conveyance process to the sintering machine 40, or the sintering process in the sintering machine 40. As shown in FIG. For this reason, when the iron ore raw material containing much fine powder is introduce | transduced into the sintering machine 40 as it is, a significant air permeability will deteriorate and the productivity of a sintered ore will be inhibited. Accordingly, the iron ore raw material is granulated to increase the strength of the granulated product.

That is, the iron ore raw materials as described above are classified according to their type and particle size, and then assembled (pseudo granulated or pelletized) in two lines of assembly lines, namely, pseudo assembly line 20 and pellet assembly line 30, and sintered. Raw pellets and pseudo-assemblies are prepared. Each assembly line is explained in full detail below.

First, the pseudo assembly line 20 will be described in detail. The pseudo assembly line 20 is a line for manufacturing a pseudo granulated product in which fine powder (for example, a particle diameter of 250 µm or less) is attached to granules (for example, particle diameter of 3 mm or more) of iron ore raw materials to be nuclear particles. . As shown in FIG. 4, the pseudo assembly line 20 kneads the raw material tank 21 for storing granulated and fine powder containing the sintered raw material, the sifting separator 22, and the sintered raw material with a water-soluble binder or the like. A kneader 23 and a granulator 24 for assembling a kneaded sintered raw material to produce a pseudo granulated product are provided.

In the raw material tank 21, iron ore raw materials containing granulated and fine powder (for example, fissolite ore), powdered coke, limestone, and the like are stored. ) Is selected by granulation of a predetermined particle diameter or more (for example, 3 mm or more) and fine powder of less than that. Since granulation can be used as a nuclear particle as it is, it is conveyed to the granulator 24.

On the other hand, the fine powder is charged into a kneading machine 23 made of, for example, a reggae mixer, and kneaded together with a binder to produce a kneaded product. The kneader 23 can use a blade rotary kneader such as a pro-share mixer or an Eirich mixer. As a binder added to the kneader, from the standpoint of increasing granulation, for example, at least one of a dispersing agent such as polyacrylic acid-based (promoting solid crosslinking and containing an aqueous solution and a colloid added with a dispersing agent), quicklime and lignin One or more types can be used. As a binder added to the kneader in the granulation process using the sintering installation which is an example of this embodiment, it is preferable to use dispersing agents, such as a polyacrylic acid type.

The kneaded material obtained by the kneader 23 and the granulation from the sieve separator 22 are charged into a granulator 24 made of a drum mixer or the like. For example, a drum mixer, a pan pelletizer, or the like can be used for the granulator 24. By this granulator 24, a kneaded material of iron ore raw material is granulated (pseudo-granulated) to become a pseudo granulated product. Specifically, by the granulation process by the granulator 24, the fine powder (for example, particle diameter 250 micrometers or less) contained in powder coke, other iron ores, and a binder adheres around the nucleus particle which is granulation, Granules (eg, particle diameters 1 to 10 mm) are produced.

Next, the pellet assembly line 30 is demonstrated in detail. The pellet assembly line 30 is a line which manufactures sintering raw material pellets which are granules which assembled the iron ore raw material which mainly makes the fine powder below a predetermined particle diameter. The iron ore raw material mainly containing fine powder is an iron ore raw material containing 60 mass% or more of particle | grains whose particle diameter is 250 micrometers or less, for example. The sintered raw material pellets are granulated products having a particle diameter of 1 to 10 mm and an average particle diameter of 5 mm, for example, and are granulated materials containing 70% by mass or more of particles having a particle diameter of 3 mm or more in the present embodiment.

As shown in Fig. 4, the pellet granulation line 30 includes a raw material tank 31 for storing iron ore raw materials mainly composed of fine powder, a sieve separator 32, and a pulverizer 33 for crushing the iron ore raw materials. And a kneader 34 for kneading the sintered raw material and the binder after grinding, a granulator 35 for assembling the kneaded sintered raw material to produce sintered raw material pellets, a sieve separator 36, and the assembled sintered raw material pellets. The dryer 37 which dries this is provided. Among these, the kneader 34 is an example of the kneader provided with the binder addition apparatus of this invention, The detail description is mentioned later.

In the raw material tank 31 of the pellet assembly line 30, various iron ore raw materials (for example, maramanba ore, deceased blockman ore, etc.) containing a lot of fine powders, fine raw materials such as steelmaking dust, pellet feed, And sintered raw materials containing binders such as limestone and the like are stored. As the iron ore, granules having a predetermined particle diameter or more are sorted and removed in advance by a sieve separator (not shown) or the like, and some fine powder (for example, a particle diameter of 3 mm or less) is facilitated and assembled. It is good from the viewpoint of the strength development of water.

The iron ore raw material supplied from this raw material tank 31 is first sorted by the sieve sorting machine 32, and the fine powder of predetermined particle diameter (for example, 3 mm) or less is supplied to the grinder 33. As shown in FIG. On the other hand, the particles having a predetermined particle diameter or more are supplied to the granulator 24 of the pseudo assembly line 20 for use as the nucleus particles of the above-mentioned pseudo granules. The grinder 33 is comprised, for example with a roller press compressor, a ball mill, etc., and grind | pulverizes the input iron ore raw material by predetermined particle size distribution. In this way, the iron ore raw material is pulverized and finely divided and granulated, whereby the subsequent granulation treatment can be made easier.

Subsequently, in the kneader 34, after the binder and the water are added to adjust the water, the fine iron ore raw material in the form of fine powder is kneaded. In this embodiment, as this kneader 34, a blade rotary kneader, such as a radig mixer and a proshare mixer, is used, for example. As described above, in the present embodiment, the kneading machine 34 is provided at the front end of the granulator 35 to increase the kneading ability of the iron ore raw material and the binder. As a binder to be added to the kneader, from the standpoint of increasing granulation, for example, a dispersing agent such as a polyacrylic acid-based (promoting solid crosslinking, including an aqueous solution and a colloid added with a dispersing agent), quicklime, and lignin At least one type can be used. As a binder added to the kneader in the granulation process using the sintering installation which is an example of this embodiment, it is preferable to use dispersing agents, such as a polyacrylic acid type.

The sintered raw material after kneading by the kneader 34 is charged into the granulator 35 and granulated. As the granulator 35, a drum mixer, a pan pelletizer, or the like can be used, for example. By granulation by such a granulator 35, for example, a substantially spherical granule having a particle diameter of 1 to 10 mm, preferably a particle diameter of 3 to 6 mm (for example, an average particle diameter of 5 mm). Sintered raw pellets, which are water, are prepared. The particle size distribution of this sintered raw material pellet may be 70 mass%, for example, 3 mm or more of particle diameters.

The sintered raw material pellets thus produced are dried by a dryer 37 after the granulated substance having a predetermined particle diameter or more is sorted by the sieve separator 36. As the dryer 37, a fluidized bed dryer, a packed bed dryer, a drum dryer, etc. can be used.

As described above, the pseudo granulated material assembled by the pseudo granulation line 20 and the sintered raw material pellets assembled by the pellet granulating line 30 are blended at a predetermined compounding ratio and supplied to the sintering machine 40. The sintering machine 40 sinters the above two kinds of sintered raw material granulated bodies to produce a sintered ore. The sintered ore is supplied to the blast furnace through crushing by a crusher (not shown) and cooling by a sinter cooler (not shown).

In the above, the whole structure of the sintering apparatus which concerns on this embodiment was demonstrated. In this embodiment, in the said pseudo assembly line and the pellet assembly line 30, in order to improve the assembly property in the granulators 24 and 35, the kneaders 23 and 34 are respectively provided in the front end, and this kneading | mixing is carried out. The binders are added to and mixed with the iron ore raw materials by the groups 23 and 34, and the resulting kneaded products are provided to the granulators 24 and 35 to be granulated. This embodiment is characterized by the binder addition method at the time of kneading by such kneaders 23 and 34, and the kneaders 23 and 34 have the binder addition apparatus of the characteristic structure in order to implement the said binder addition method. Equipped with. In addition, the kneader 50 shown in FIG. 5 mentioned later is applicable suitably to the kneaders 23 and 34 of the sintering installation shown in FIG. The binder addition apparatus and the binder addition method of the kneader 50 which are the feature which concerns on this embodiment are mentioned later (refer FIG. 5 thru | or 7).

[2. Verification Results of Necessity of Binder Concentration Control]

Next, prior to the detailed description of the binder addition method according to the present embodiment, the necessity of controlling the binder concentration accurately and quickly when adding the binder to the kneader is an example of the binder addition method shown in FIGS. 2 and 3. The results of the verification using the following will be described.

As described above, in the binder addition method of FIGS. 2 and 3, in order to add a uniform aqueous solution of the binder to the iron ore raw material, the binder raw solution and water for adjusting water (addition water) are mixed using the static mixer 10. A binder aqueous solution of a predetermined concentration was produced, the binder aqueous solution was supplied to the kneader 1 through one pipe 5, and added to the iron ore raw material from the body portion 2 of the kneader 1. In addition, since the moisture (raw material moisture) contained in the iron ore raw material fed into the kneader 1 varies, the appropriate value of the binder concentration added to the raw material also changes every time. If the binder concentration added to the iron ore raw material in the kneader 1 is not an appropriate value, granulation property in the subsequent granulation step is lowered. Therefore, when the raw material moisture changes, it is necessary to change the binder concentration to a concentration suitable for the raw material moisture after the change as soon as possible.

However, since the binder addition method of FIG. 2 and FIG. 3 is an apparatus structure which supplies the binder aqueous solution to the piping 5 from the static mixer 10 to the kneader 1, when the raw material moisture changes, The flow rate adjustment valves 11 and 14 adjust the flow rates of the binder stock solution and the additive water supplied to the static mixer 10, and remain in the pipe 5 even if controlled at a binder concentration suitable for the raw material moisture after the change. A binder aqueous solution (a binder aqueous solution of a concentration suitable for the raw material moisture before the change) is supplied to the kneader 1 and added to the raw material. As described above, the binder addition method of FIGS. 2 and 3 has a delay in changing the binder concentration by the amount of the binder aqueous solution remaining in the pipe 5, so that the responsiveness to the change of the raw material moisture Was bad.

Thus, the inventors of the present invention, in the binder addition method of Figs. 2 and 3, how much adversely affects the binder concentration of the kneaded product suitable for granulation when the aqueous binder solution remaining in the pipe 5 is changed when the raw material moisture is changed. The verification was done.

The results are shown in Table 1 and Table 2. Table 1 shows the titration of the binder solids in the raw material when the proportion of the water (raw material moisture ratio) occupied by the iron ore raw material introduced into the kneader 1 is lowered from 8.5 mass% to 8.0 mass% in the binder addition method. The result of verifying the difference from the value is shown. Table 2 shows the result of verifying the difference from the appropriate value of the binder solid content in the raw material when the raw material moisture ratio rose from 8.0 mass% to 8.5 mass%. In the verification, the pipe 50A having a length of 20 m was used as the pipe 5 in the binder addition method of FIG. 2.

Item unit Before change After change Raw material input amount S _F / t (t represents time. Hereinafter, same) dry-ton / h 200 200 Raw Material Moisture Ratio R _wo % 8.5 ⇒ 8 Raw Material Moisture W _F / t ton / h 18.6 17.4 Binder Solid Content (Set Value) Rs % 0.1 0.1 Solid content in binder stock solution S _B / t ton / h 0.2 0.2 Binder Stock Solution (S _B + W _B ) / t ton / h 0.44 0.44 Moisture content in binder stock solution W _B / t ton / h 0.24 0.24 Raw water after mixing ratio (setting value) R _w1 (= the moisture ratio suitable for assembly) % 9 === 9 Moisture content after mixing (W _F + W _B B + W _W ) / t ton / h 19.8 19.8 Addition water supply W _B / t ton / h 1.0 2.2 Aqueous Binder Supply (S _B + W _B + W _W ) / t ton / h 1.4 2.6 Binder Concentration C _B mass% 14.1 7.7 Specific gravity of binder aqueous solution in pipe d ton / m3 1.08 1.04 Residual volume V of binder aqueous solution in piping m3 0.044 0.044 Mass Q of binder aqueous solution in pipe (= d × V) ton 0.048 0.046 Time A to Extrude Aqueous Solution in Pipe after Change of Raw Water sec  - 63.3 Actual supply amount of binder solids at time A S _B '/ t ton / h  - 0.38 Deviation from Proper Value S _B of Actual Binder Solid S _B 'at Time A ship  - 1.9

Table 1: Differences in Binder Solid Contents when Raw Material Moisture Drops from 8.5 Mass% to 8.0 Mass%

Item unit Before change After change Raw material input amount S _F / t (t represents time. Hereinafter, same) dry-ton / h 200 200 Raw Material Moisture Ratio R _wo % 8 ⇒ 8.5 Raw Material Moisture W _F / t ton / h 17.4 18.6 Binder Solid Content (Set Value) Rs % 0.1 0.1 Solid content in binder stock solution S _B / t ton / h 0.2 0.2 Binder Stock Solution (S _B + W _B ) / t ton / h 0.44 0.44 Moisture content in binder stock solution W _B / t ton / h 0.24 0.24 Raw water after mixing ratio (setting value) R _w1 (= the moisture ratio suitable for assembly) % 9 === 9 Moisture content after mixing (W _F + W _B B + W _W ) / t ton / h 19.8 19.8 Addition water supply W _B / t ton / h 2.2 1.0 Aqueous Binder Supply (S _B + W _B + W _W ) / t ton / h 2.6 1.4 Binder Concentration C _B mass% 7.7 14.1 Specific gravity of binder aqueous solution in pipe d ton / m3 1.04 1.08 Residual volume V of binder aqueous solution in piping m3 0.044 0.044 Mass Q of binder aqueous solution in pipe (= d × V) ton 0.046 0.048 Time A to Extrude Aqueous Solution in Pipe after Change of Raw Water sec  - 120.8 Actual supply amount of binder solids at time A S _B '/ t ton / h  - 0.10 Deviation from Proper Value S _B of Actual Binder Solid S _B 'at Time A ship  - 0.52

Table 2: Differences in Binder Solid Contents When Raw Material Water Content Rise from 8.0 Mass% to 8.5 Mass%

At this time, various terms used in Tables 1 and 2 are defined. In addition, binder aqueous solution is the aqueous solution which mixed the binder raw liquid and water (added water), and raw material moisture is the water which an iron ore raw material contains.

Mass of water in binder stock solution: WB (ton)

Mass of solids in binder stock solution: SB (ton)

Mass of added water: WW (ton)

Mass of raw material moisture before entering the kneader: WF (ton)

Mass of iron ore raw material before entering the kneader: SF (dry-ton)

Binder concentration CB is the density | concentration (mass%) of the binder aqueous solution added to iron ore raw material, and is represented by the following formula.

CB = {SB / (SB + WB + WW)} × 100

Binder aqueous solution addition amount T is the mass of the binder aqueous solution added to an iron ore raw material, and is represented by the following formula.

T = SB + WB + WW

Binder solid content ratio RS is the ratio (mass%) of the mass SB of solid content in a binder stock solution with respect to the mass SF of an iron ore raw material, and is represented by the following formula.

RS = {SB / SF} × 100

Raw material moisture ratio RW0 is the ratio (mass%) of the mass WF of raw material moisture with respect to the total mass (SF + WF) of an iron ore raw material and raw material moisture, and is represented by the following formula.

RW0 = {WF / (SF + WF)} × 100

Raw material moisture ratio RW1 after mixing is the ratio (mass%) of the mass of all the moisture with respect to the total mass after mixing binder aqueous solution and iron ore raw material, and is represented by the following formula.

RW1 = {(WF + WB + WW) / (SF + SB + WF + WB + WW)} × 100

Next, the verification result of Table 1 and Table 2 is demonstrated.

As the binder addition method shown in FIG. 2, as shown in Table 1, when the raw material moisture ratio RW0 decreased from 8.5 mass% to 8.0 mass%, the binder concentration CB (14.1 mass%) of the binder aqueous solution remaining in the piping 5 ) Is higher than the optimum concentration CB (7.7 mass%) with respect to the raw material moisture ratio (8.0 mass%) after reduction. For this reason, in period A during which the high concentration binder aqueous solution remaining in the pipe 5 is added to the raw material, the solid content SB 'of the binder about 1.9 times the optimum value SB is supplied to the iron ore raw material in the kneader 1. In kneading, the binder concentration becomes too high. As a result, the binder becomes excessively supplied, and the kneaded material is slurried, and thus, the granularity of the kneaded product is degraded or the kneaded material cannot be conveyed.

On the other hand, as shown in Table 2, when raw material moisture ratio RW0 rose from 8.0 mass% to 8.5 mass%, binder concentration CB (7.7 mass%) of the binder aqueous solution remaining in piping 5 will raise raw material moisture after a raise. It is lower than the optimum concentration CB (14.1 mass%) for the ratio (8.5 mass%). For this reason, at time A during which the low concentration binder aqueous solution remaining in the pipe 5 is added to the raw material, only the solid SB 'in the binder about 0.52 times the optimum value SB is supplied to the iron ore raw material in the kneader 1. As a result, the binder concentration becomes too low in kneading. As a result, the binder becomes insufficient in supply, and the grain size of the granulated material is reduced, and the like has a significant effect.

As can be seen from the verification results in Tables 1 and 2, the binder addition method of FIG. 2 is granulated even if the moisture of the iron ore raw material introduced into the kneader 1 only changes by about 0.5% by mass. There is a problem that the sex is greatly reduced. In addition, even with the binder addition method of FIG. 3, the above problem is somewhat improved, but since the responsiveness of the static mixer 10 when the binder concentration is changed in accordance with the change in the moisture of the raw material is poor, Until the pressure balance was normalized, there was a problem in that a binder aqueous solution of a concentration out of an appropriate concentration was added. As described above, in the binder addition method of FIGS. 2 and 3, the static mixer 10 may be used to produce a binder solution having a uniform concentration. There is a technical problem that the aqueous binder solution cannot be supplied.

In addition, in the binder addition method of FIG. 2 and FIG. 3, since the binder aqueous solution is sprayed from the addition nozzle 6 connected to the body part 2 of the blade-type kneader 1, as shown in FIG. If the fixing layer 4 is formed in the inner peripheral surface of the body part 2, there existed a technical problem that the binder aqueous solution cannot be spread | spread uniformly with respect to the raw material in the kneader 1.

Therefore, in order to solve all of these technical problems, the binder addition method which concerns on this embodiment is kneader | mixed in the state which the flow rate control of the binder stock solution and the addition water with high precision were respectively carried out by separate piping, as described in detail below. It conveys to the raw material input part of this, It mixes both in the mixing nozzle provided in the said raw material input part, and sets it as binder aqueous solution, The binder aqueous solution is added to the iron ore raw material thrown into a kneading machine from the said mixing nozzle.

[3. Binder Adding Device and Addition Method]

Next, with reference to FIG. 5, the binder addition apparatus which concerns on one Embodiment of this invention, and the binder addition method using this are demonstrated. It is a schematic diagram which shows the kneader equipped with the binder addition apparatus which concerns on this embodiment. In addition, the kneader 50 shown in FIG. 5 is applicable to the kneaders 23 and 34 provided in the pseudo assembly line 20 and the pellet assembly line 30 of the sintering facility shown in FIG.

As shown in FIG. 5, the kneading machine 50 which concerns on this embodiment is a kneading machine of a blade | wing rotation structure, For example, it is comprised by a reggae mixer, a proshare mixer, etc. The kneader 50 includes a cylindrical body portion 52 for receiving a kneaded material (for example, iron ore raw material 57), a plurality of stirring vanes 53 rotated by the rotating shaft 54, and a rotating shaft. A driving unit (not shown) for rotating the 54, a raw material input unit 55 composed of a backing hopper or the like, and a conveying unit 56 such as a belt conveyor for conveying the iron ore raw material 57. Equipped.

In the kneader 50 of such a structure, the iron ore raw material 57 conveyed by the conveyance part 56 falls from the edge part of the conveyance part 56, and the body of the kneader 50 from the raw material input part 55 is carried out. It is injected into the unit 52. At the time of this raw material addition, the binder aqueous solution is added to the iron ore raw material 57 from the mixing nozzle 70 mentioned later. The iron ore raw material 57 introduced into the body portion 52 is agitated by the stirring blades 53 rotating around the rotation shaft 54, and the inside of the body portion 52 has a predetermined direction (for example, the left side of FIG. 5). Direction). As a result, the iron ore raw material 57 and the binder aqueous solution are kneaded to produce a kneaded product having a predetermined particle diameter (e.g., several hundred mu m to several mm in diameter) suitable for granulation in a subsequent granulation step. This kneaded material is discharged | emitted from the discharge port (not shown) of the body part 52, and is conveyed to a granulator. In this embodiment, the structure and the addition method of the binder addition apparatus which add a binder to the iron ore raw material 57 in such a kneading machine 50 are characteristic.

Here, the binder will be described first. A binder is a granulation processing agent used for granulating the iron ore raw material containing fine iron ore. It is preferable to use a polyacrylic acid-based dispersant for maintaining the dispersibility of the fine particles of the iron ore raw material so that the binder can improve the granulation property in the granulation step at the end of the kneading step.

As such a binder, the granulation treatment agent (polyacrylic acid type dispersing agent) described in Unexamined-Japanese-Patent No. 2003-155524 can be used suitably, for example. This granulation treatment agent contains a water-soluble high molecular compound having a clay dispersion capacity of 0.5 or more. The said high molecular compound contains a carboxyl group and / or its salt, the number average molecular weight exists in the range of 500 or more and 20000 or less, and the polydispersity represented by a weight average molecular weight / number average molecular weight is 1.2 or more and 12.0 or less You may be mine. More specifically, the polymer compound is neutralized to at least one selected from the group consisting of, for example, some or all of the carboxyl groups contained in (a) polyacrylic acid and (b) polyacrylic acid. It may be at least one kind of compound selected from the group consisting of polyacrylates.

By using such a polyacrylic acid-based dispersant as a binder and adding it to an iron ore raw material containing iron ore fine powder, the fine powder can be uniformly dispersed in the raw material. It becomes possible to adhere around the nuclear particle (assembly). Therefore, when granulating (pseudo-granulated or pelletized) iron ore raw materials containing fine powder, the dispersibility of the fine powder in the raw materials can be maintained high, and the effect of adhering the dispersed fine powder around the nucleus particles can be enhanced. have. Therefore, the iron ore raw material can be granulated (pseudo-particle or pelletized) very suitably, and the granulation can be improved.

Next, with reference to FIG. 5, the binder addition apparatus and the addition method in the kneading machine 50 which concern on this embodiment are demonstrated. As shown in FIG. 5, the binder adding device includes a binder supply pipe 63 for supplying a binder stock solution, a water supply pipe 66 for supplying water for adjusting water (additional water), and the binder supply pipe 63. And a mixing nozzle 70 connected to the distal end of the water supply pipe 66, and a control device (not shown) for controlling the flow rates of the binder supply pipe 63 and the water supply pipe 66.

The binder supply pipe 63 is a pipe for supplying the binder stock solution to the mixing nozzle 70 from a binder supply source (for example, a binder stock solution tank. Not shown). The flow rate adjustment valve 61 and the electromagnetic flowmeter 62 are provided in the middle of the binder supply piping 63. The electromagnetic flowmeter 62 measures the flow rate of the binder stock solution flowing in the binder supply pipe 63, and the flow rate adjusting valve 61 is based on the measurement result of the electromagnetic flowmeter 62 and information such as raw material moisture content or raw material input amount. Thus, the flow rate of the binder raw liquid in the binder supply pipe 63 is controlled to the predetermined predetermined flow rate. In addition, although the binder supply piping 63 which concerns on this embodiment supplies the binder raw liquid as a binder of this invention, this invention is not limited to this example, For example, the binder which thinned the binder raw liquid to predetermined concentration previously, for example. You may supply an aqueous solution.

The water supply pipe 66 is a pipe for supplying additional water for adjusting the concentration of the binder aqueous solution from the water supply source (for example, a water tank. Not shown) to the mixing nozzle 70. In the middle of the water supply piping 66, the flow control valve 64 and the electromagnetic flowmeter 65 are provided. The electromagnetic flowmeter 65 measures the flow rate of the added water flowing in the water supply pipe 66, and the flow control valve 64 is based on the measurement result of the electromagnetic flowmeter 65 and information such as raw material moisture content or raw material input amount. The flow rate of the added water in the water supply pipe 66 is controlled to the predetermined predetermined flow rate.

Moreover, although the binder addition apparatus is equipped with the control apparatus (not shown), the data which measured the moisture of a raw material or the input amount of the iron ore raw material 57 put into the kneading machine 50 is input into a control apparatus. The control device obtains information such as the raw material moisture content or the raw material input amount based on the input data, calculates the control amount of the flow regulating valve 61 or the flow regulating valve 64, and calculates the opening degree of each regulating valve. Instruct.

As described above, the raw material moisture constantly changes depending on the storage state of the iron ore raw material, the climate, the raw material compounding ratio, and the like. The controller of the binder adding device according to the present embodiment controls the flow rate adjusting valve 61 or the flow rate adjusting valve 64 in accordance with the variation of the raw material moisture, and the amount and amount of the binder raw liquid supplied to the mixing nozzle 70. The quantity is controlled precisely. In addition, by setting the cutting amount from the raw material tank with respect to the raw material input amount, although quantitative supply of iron ore raw material is basically provided, some amount of fluctuation may actually occur.

Before inputting into the kneader 50, the raw material input amount by the conveyance part 56 (belt conveyor etc.) is measured by measuring means, such as a belt scale, for example, and the binder stock solution amount according to the measured value It is also possible to precisely control the amount of added water.

By the binder supply pipe 63, the water supply pipe 66, and the flow rate control mechanism as described above, the flow rate of the binder raw liquid and the added water supplied to the mixing nozzle 70 can be controlled with high accuracy. Therefore, it is possible to control the concentration and amount of the binder aqueous solution added to the iron ore raw material 57 from the mixing nozzle 70 with high accuracy according to the raw material moisture or the raw material input amount of the iron ore raw material 57.

Next, the function of the mixing nozzle 70 which is the characteristic which concerns on this embodiment is demonstrated. The structure of the mixing nozzle 70 is mentioned later. The mixing nozzle 70 mixes the binder stock solution and the water, which are separately supplied by the binder supply pipe 63 and the water supply pipe 66, and the binder aqueous solution obtained by the mixing. It has a function to spray on the iron ore raw material 57 that is injected into. In addition, since the mixing nozzle 70 is open at the exit side of the nozzle, the binder stock solution and the added water do not interfere with each other in the static mixer like the static mixer, so that the pressure balance of both is not broken. Flow rate is stable without delay control. By using such a mixing nozzle 70, the binder addition method which concerns on this embodiment can be performed suitably.

The mixing nozzle 70 is installed near the raw material input unit 55 of the kneader 50 and sprays the binder aqueous solution directly on the iron ore raw material 57 introduced to the raw material input unit 55. At this time, the vicinity of the raw material input unit 55 where the mixing nozzle is provided is an arbitrary position where the binder aqueous solution can be directly sprayed from the mixing nozzle 70 with respect to the iron ore raw material 57 introduced into the kneader 50. For example, as shown, the mixing nozzle 70 may be provided in the vicinity of the raw material input part 55 (the position where the mixing nozzle 70 is separated from the raw material input part 55), and although not shown in FIG. The mixing nozzle 70 may be provided at any part (for example, the hopper side) of the raw material input part 55.

Thus, by installing the mixing nozzle 70 near the raw material input part 55 of the kneader 50, the iron ore raw material which throws into the raw material input part 55 the binder aqueous solution mixed with the mixing nozzle 70 is supplied. It can be added by spraying directly on (57). Thereby, the binder addition apparatus which concerns on this embodiment becomes more responsive to the fluctuation | variation of the raw material moisture of the iron ore raw material 57, and can respond quickly to the change of binder concentration and addition amount.

That is, as mentioned above, in the addition method using the static mixer 10 shown in FIG. 2 and FIG. 3, when the raw material moisture fluctuates, the flow volume of the piping 13, 16 is changed immediately, and the static mixer 10 It was intended to change the amount of the binder stock solution and the amount of addition to be mixed by. However, due to the nature of the piping circuit, there has been a first problem that the binder aqueous solution of inappropriate concentration remaining in the piping 5 downstream of the static mixer 10 is somehow added to the iron ore raw material. In addition, when the flow rate (pressure) of the binder stock solution and the additive water flowing in the pipes 13 and 16 is changed, both of them interfere with each other in the static mixer 10 and the pressure balance of both is broken. There is a second problem that it takes time to normalize to the aqueous binder solution. Because of these problems, it was not possible to immediately add a binder aqueous solution having an appropriate concentration to the raw material moisture after the fluctuation, and the response to the fluctuation of the raw material moisture was poor.

On the other hand, in the binder addition method which concerns on this embodiment, piping 63 and 66 which differ from each other to the raw material input part 55 (near the binder addition position) of the kneader 50 is added to the binder raw liquid and addition water. It conveys in the state of the flow rate-controlled by high precision, and mixes by the mixing nozzle 70, and adds it directly to the iron ore raw material 57. For example, when the raw material moisture rises, the flow rate adjusting valve 64 reduces the flow rate of the added water in the water supply pipe 66 by an appropriate amount. In addition, when the raw material water falls, the flow rate adjusting valve 64 increases the flow rate of the added water in the water supply pipe 66 by an appropriate amount. As a result, the mixing nozzle 70 mixes the binder stock solution and the additive water after the flow rate adjustment is individually and precisely adjusted to the binder supply pipe 63 and the water supply pipe 66, thereby providing a binder having a concentration appropriate for the raw material moisture after the change. The aqueous solution is produced with high precision and quickly added.

In addition, in the above, the method of adjusting the flow volume of the addition water in the water supply piping 66 and controlling the binder input amount with respect to the increase / decrease of raw material moisture was demonstrated, but as another method, a flow control valve By the 61, the flow rate of the binder raw liquid in the binder supply pipe 63 can be adjusted to control the binder input amount. In this case, however, since the actual (net) amount of binder introduced into the kneader 50 is changed and the addition ratio of the binder to the raw material is changed, the water supply pipe 66 is operated by the flow rate adjustment valve 64 described above. It is good to use the method of adjusting the flow volume of the added water inside.

By the above, the binder addition method which concerns on this embodiment does not need to use the static mixer 10 which is poor in responsiveness to change of binder concentration according to the fluctuation | variation of the said raw material moisture as a mixing means, and uses the mixing nozzle 70. By using it, a binder concentration can be changed immediately in response to the fluctuation | variation of raw material moisture, and it is excellent in the responsiveness of binder concentration control. Therefore, there is an effect that the binder concentration can be controlled with high precision, and the binder aqueous solution of the optimal concentration can be quickly added to the raw material moisture after fluctuation.

In addition, in the mixing nozzle 70, the binder stock solution and the additive water are mixed in advance before addition, and a binder aqueous solution of a uniform concentration is generated, and the binder aqueous solution from the mixing nozzle 70 is added to the iron ore raw material 57 to be added. Spray directly. Thereby, there exists an effect which can uniformly add the binder aqueous solution of uniform density | concentration with respect to the iron ore raw material 57. FIG.

In addition, rather than adding the binder aqueous solution from the body part 52 of the kneader 50, the binder aqueous solution is added with respect to the iron ore raw material 57 in the position before it is injected into the kneader 50. As shown in FIG. For this reason, the addition of the binder aqueous solution is inhibited by the fixing layer 4 formed in the inner peripheral surface of the body part 2 of the kneader 1 as shown in FIG. 1, and can also prevent the problem that it adds unevenly. . That is, in the present embodiment, the binder aqueous solution is not added from the body portion 52, and the iron ore raw material 57 before the introduction into the body portion 52 from the mixing nozzle 70 disposed near the raw material input portion 55. The binder aqueous solution is added to (). For this reason, even if the fixing layer 4 is formed in the inner peripheral surface of the body part 52 of the kneader 50, uniform addition of a binder is not inhibited by the fixing layer 4, A binder can be added uniformly with respect.

[4. Specific configuration of mixing nozzle]

Next, with reference to FIG. 6, the concrete structure of the mixing nozzle 70 for implementing the binder addition method which concerns on the said embodiment very suitably is demonstrated in detail. FIG. 6: is a longitudinal cross-sectional view which shows the structural example of the mixing nozzle 70 of the binder addition apparatus which concerns on this embodiment.

As shown in FIG. 6, the mixing nozzle 70 has a double cylindrical structure composed of an outer nozzle 71 and an inner nozzle 72. The outer nozzle 71 is a relatively large cylindrical member, and the inner nozzle 72 is a small cylindrical member having a smaller diameter than the outer nozzle 71. The inner nozzle 72 is provided inside the outer nozzle 71 so that a cross section may become concentric. In addition, in the example of this mixing nozzle 70, although the mixing nozzle is a double cylinder structure, it is not limited to a cylindrical structure, A polygonal cylinder structure may be sufficient.

The tip end of the binder supply pipe 63 is connected to an inlet 74 formed through the outer side of the nozzle 71. In FIG. 6, the binder supply pipe 63 is vertically connected with respect to the side surface of the outer nozzle 71, but this connection angle is not particularly limited. In addition, although the structure of one binder supply piping 63 connected to the outer nozzle 71 in one place in the example of FIG. 6, it is not limited to this example, For example, except the some binder supply piping 63 You may connect to the some part of the circumferential direction of the nozzle 71. FIG. Thereby, a binder can be supplied in the outer nozzle 71 more uniformly.

In addition, when the viscosity of the binder stock solution is relatively high, as in the example of FIG. 6, the binder stock solution B is simply dropped from the binder supply pipe 63, and is supplied into the outer nozzle 71. However, when the viscosity of the binder stock solution B is relatively low (for example, when a predetermined amount of additive water is mixed in advance), the binder stock solution is sprayed using a spray nozzle in the same manner as the spraying of the additive water W. (B) can also be sprayed and supplied in the outer nozzle 71. FIG.

On the other hand, the front end of the water supply pipe 66 is connected to communicate with the internal nozzle 72. In the example of FIG. 6, the socket 73 for reducing the diameter of the pipe is connected to the front end of the water supply pipe 66, and the inner nozzle 72, which is a spray nozzle for addition water, is connected to the front end of the socket 73. Connected. By this structure, the additional water W supplied by the water supply piping 66 can be sprayed into the outer nozzle 72 from the nozzle port 75 of the front end part of the inner nozzle 72. In addition, as shown, the nozzle member is separately provided in the front end of the water supply piping 66, and is not limited to the example comprised as the inner nozzle 72, For example, the front end of the water supply piping 66, and the By integrally constructing the inner nozzle 72, the tip end portion of the water supply pipe 66 may function as the inner nozzle 72.

In addition, the front end of the water supply pipe 66 and the inner nozzle 72 are disposed inside the outer nozzle 71 in the same direction as the axial direction of the outer nozzle 71, and added to the front end of the inner nozzle 72. A nozzle port 75 having a structure in which the water W is diffused and sprayed is provided. The position of the nozzle port 75 of the front end of the inner nozzle 72 is downstream (lower) than the inlet 74 of the outer nozzle 71 to which the binder supply pipe 63 is connected, and the front end of the outer nozzle 71. It is arranged in the nozzle inner side (upper part) rather than the nozzle 76 of the.

By this arrangement, the addition water W is directed downward from the nozzle port 75 of the inner nozzle 72 to be diffused and sprayed inside the outer nozzle 71 and along the inner surface of the outer nozzle 71. It collides and mixes with the falling binder stock solution (B). By colliding and mixing sprayed addition water W with a binder, a binder can be mixed uniformly in addition water. Thereby, a binder can be supplied in the outer nozzle 71 more uniformly.

Next, operation | movement of the mixing nozzle 70 of FIG. 6 of the above structure is demonstrated. The binder raw liquid B supplied via the binder supply pipe 63 is discharged (inflowed) from the inlet port 74 of the outer nozzle 71 into the outer nozzle 71 and falls along the inner circumferential surface of the outer nozzle 71. On the other hand, the additive water W supplied via the water supply pipe 66 is diffused and sprayed from the nozzle port 75 of the inner nozzle 72 into the outer nozzle 71. As a result, on the inner lower side of the outer nozzle 71, the diffusion water sprayed W and the binder stock solution B collide with each other to produce a binder aqueous solution M having a predetermined concentration. This binder aqueous solution M is sprayed toward the iron ore raw material 57 from the nozzle port 76 of the tip part of the outer nozzle 71 by the spraying pressure of the said addition water W. FIG. Thereby, the mixing nozzle 70 can generate | occur | produce the binder aqueous solution M of uniform density | concentration in the binder addition position (near the raw material input part 55), and can apply | coat to the iron ore raw material 57. FIG.

Next, with reference to FIG. 7, the other structure of the mixing nozzle 70 for implementing the binder addition method which concerns on the said this embodiment suitably is demonstrated. FIG. 7: is a longitudinal cross-sectional view which shows the structure of the mixing nozzle 70 of the binder addition apparatus which concerns on the modification of this embodiment.

As shown in FIG. 7, the mixing nozzle 70 which concerns on a modification also has the double cylinder structure which consists of the outer nozzle 81 and the inner nozzle 82 similarly to the mixing nozzle 70 of FIG. The outer nozzle 81 is a relatively large cylindrical member, and the inner nozzle 82 is a smaller cylindrical member than the outer nozzle 81. The inner nozzle 82 is provided inside the outer nozzle 81 so that the cross section may be concentric.

In the example of FIG. 7, the distal end portion of the binder supply pipe 63 is integrally formed with the internal nozzle 82. That is, the inner diameter and the outer diameter of the binder supply pipe 63 and the inner nozzle 82 have the same diameter, and the tip end portion of the binder supply pipe 63 functions as the inner nozzle 82, so that the binder supply pipe 63 The tube serves as the nozzle sphere 85. Such a configuration is useful when, for example, the viscosity of the binder stock solution B is relatively high, and the binder stock solution B supplied by the binder supply pipe 63 has a nozzle structure of the inner nozzle 82 among its tips. It discharges from 85, and hangs below by self weight. In addition, the nozzle sphere 82 here means the discharge port for discharging a liquid, and is not limited to the small hole for spraying a liquid.

In addition, the structure of the front-end | tip part of the binder supply piping 63 and the internal nozzle 82 is not limited to the structure of FIG. For example, a nozzle member for discharging the binder raw liquid may be separately provided at the distal end of the binder supply pipe 63 to function as the inner nozzle 82. For example, when the viscosity of the binder raw liquid B is relatively low (for example, when a predetermined amount of additive water is mixed in advance), the inner nozzle 82 is provided at the tip of the binder supply pipe 63. As the spray nozzle (not shown), a binder stock solution B may be sprayed into the outer nozzle 81 from the nozzle port 85 of the spray nozzle.

On the other hand, the tip end of the water supply pipe 66 is connected to an opening 84 formed through the side surface of the outer nozzle 81. In detail, the larger diameter connecting pipe 87 than the water supply pipe 66 is connected to the peripheral portion of the opening 84 of the outer nozzle 81. The water supply pipe 66 is attached to the connection pipe 87 via the flange 88 in a state where the tip thereof is disposed inside the connection pipe 86. At this time, the tip portion of the water supply pipe 66 is disposed in a direction perpendicular to the extending direction of the outer nozzle 81 and is connected perpendicularly to the side surface of the outer nozzle 81, but is not limited to this connection direction, Arbitrary connection direction may be sufficient as the additional water W can be sprayed on the binder stock solution (B). In this way, the front end of the water supply pipe 66 is connected to the periphery of the opening 84 of the outer nozzle 81 via the connecting pipe 87 and the flange 88.

Moreover, the spray nozzle 90 for spraying additional water W in the outer nozzle 81 is attached to the front-end | tip part of this water supply piping 66. As shown in FIG. In detail, the socket 89 for reducing the diameter of the pipe is connected to the distal end of the water supply pipe 66, and the spray nozzle 90 for the additional water is connected to the distal end of the socket 89. The spray nozzle 90 is disposed near the opening 84 of the outer nozzle 81. By such a configuration, in the opening 84 of the outer nozzle 81, the additional water W supplied by the water supply pipe 66 is transferred from the nozzle 91 at the tip of the spray nozzle 90 to the outer nozzle. Spray in 81.

In addition, the front end of the binder supply pipe 63 and the inner nozzle 82 are disposed in the same direction as the axial direction (for example, the vertical direction) of the outer nozzle 81 inside the outer nozzle 81. The position of the nozzle sphere 85 at the tip end of the inner nozzle 82 is the nozzle inside (upper) than the nozzle 86 at the tip end of the outer nozzle 81, and the outer nozzle 81 to which the water supply pipe 66 is connected. It is arrange | positioned upstream (upper) rather than the opening 84 of (). By this arrangement, the additive water W is sprayed in the horizontal direction from the spray nozzle 90 disposed in the opening 84 of the outer nozzle 81, and the sprayed additive water W is the external nozzle 81. It is diffused and sprayed inside of and collided with and mixed with the binder raw liquid B falling from the nozzle port 85 of the inner nozzle 82.

In addition, although the structure of one water supply piping 66 connected to the external nozzle 81 in one place in the example of FIG. 7, it is not limited to this example, For example, the some water supply piping 66 is provided. You may connect to the some part of the outer nozzle 81 in the circumferential direction. Thereby, the addition water W can be supplied to the outer nozzle 81 more uniformly.

Next, operation | movement of the mixing nozzle 70 of FIG. 7 of the above structure is demonstrated. The binder raw liquid B supplied via the binder supply pipe 63 is discharged (inflowed) from the nozzle port 85 of the inner nozzle 82 into the outer nozzle 81 and falls downward. On the other hand, the additive water W supplied through the water supply pipe 66 is separated from the binder raw liquid B falling from the nozzle port 91 of the spray nozzle 90 disposed in the opening 84 of the outer nozzle 81. Diffuse and spray in the outer nozzle 81 toward the. As a result, at the inner lower side of the outer nozzle 81, the diffused and sprayed addition water W and the binder raw liquid B collide with each other to form a binder aqueous solution M having a predetermined concentration. This binder aqueous solution M is sprayed toward the iron ore raw material 57 from the nozzle 86 of the tip part of the outer nozzle 81 by the spraying pressure of the said addition water W. FIG. Thereby, the mixing nozzle 70 can produce | generate the binder aqueous solution M of uniform density | concentration in the binder addition position (near the raw material input part 55), and can spray | spray on the iron ore raw material 57. FIG.

As mentioned above, with reference to FIG. 6 and FIG. 7, the specific structure of the mixing nozzle 70 which concerns on this embodiment was demonstrated. According to the mixing nozzle 70 which concerns on this embodiment, the binder aqueous solution M of uniform density | concentration is produced in the vicinity of the raw material input part 55 of the kneader 50, and it spreads evenly on the iron ore raw material 57 can do. In addition, when changing the binder concentration in accordance with the fluctuation of raw material moisture, the responsiveness to the change of the binder concentration is also high, and the binder aqueous solution of a uniform concentration can be controlled with high precision.

Specifically, in the binder addition method of FIGS. 2 and 3 described above, the binder stock solution and the added water were mixed in the sealed static mixer 10. For this reason, when the pressure balance of the binder stock solution and the addition water in the static mixer 10 fell with the flow rate change of the binder stock solution or the addition water, there existed a problem that it took time until it normalized. On the other hand, in this embodiment, the binder raw liquid B and the addition water W are mixed in the mixing nozzle 70 opened to air | atmosphere. Therefore, pressure is not applied to the binder raw liquid B or the additive water W in the mixing nozzle 70, and the binder raw liquid B and the additive water W can be mixed in the open pressure. Therefore, it is possible to respond quickly to the change of the binder concentration according to the fluctuation of raw material moisture, and the concentration of the aqueous binder solution to be produced and distributed is also uniform.

[5. effect]

As mentioned above, the binder addition apparatus and binder addition method applied to the kneading machine 50 which concerns on this embodiment were explained in full detail. According to this embodiment, the mixing nozzle 70 is arrange | positioned in the vicinity of the raw material input part 55 (binder addition position) of the kneading machine 50, and the piping 63 and 66 which differ from binder raw liquid and addition water are used. Then, it supplies to the mixing nozzle 70 in the state which controlled each flow volume with high precision. In addition, by the mixing nozzle 70, the binder stock solution and the added water are mixed to generate a binder aqueous solution, and the binder aqueous solution is directly added to the iron ore raw material 57 introduced into the kneader 50.

This mixing nozzle 70 has a double-cylindrical structure in order to uniformly mix the binder stock solution and the added water before addition. Thereby, the mixing nozzle 70 collides and mixes the binder raw liquid B and the additional water W by spraying the addition water W with respect to the binder raw liquid B in the inside of the outer nozzle 71, 81. FIG. The binder aqueous solution M of a uniform density | concentration is produced | generated, and can be sprayed on the iron ore raw material 57. FIG.

By the above structure, the binder addition method which concerns on this embodiment can add the binder aqueous solution of a uniform density | concentration to iron ore raw material uniformly, and also adds to the raw material according to raw material input amount, fluctuation of raw material moisture, etc. The concentration and the amount of addition can be controlled quickly and with high precision.

That is, as described above, the raw material moisture constantly changes depending on the storage state of the iron ore raw material, the climate, the raw material compounding ratio, and the like. According to this embodiment, according to the fluctuation | variation of this raw material moisture, the amount of binder stock solution and the quantity of addition can be controlled with high precision. In addition, also about the raw material input amount, before input to the kneading machine 50, the raw material input amount of the iron ore raw material conveyed by the conveying part 56 is measured, and according to the measured value, the binder stock solution amount and The quantity of addition can be controlled with high precision. As described above, according to the present embodiment, the amount of binder stock solution and the amount of added water can be precisely adjusted in accordance with the raw material input amount and the raw material moisture, which are fluctuating factors, and the binder aqueous solution of the optimum concentration can be added.

In detail, since the binder raw liquid and the added water are conveyed to another pipe to the mixing nozzle 70 disposed just before the addition position, it is possible to cope with the fluctuation of the raw material moisture or the input amount of the iron ore raw material 57 introduced into the kneader 50. It is possible to produce a binder aqueous solution of a concentration suitable for the raw material moisture after the fluctuation or the raw material input amount and fluctuate quickly and with high accuracy, and add it to the iron ore raw material 57. Therefore, as in the addition method shown in Figs. 2 and 3, it is possible to prevent the addition of an aqueous solution of a binder of an improper concentration remaining in the pipe 5 when the binder concentration is changed, and at the same time, Even if the static mixer 10 having low responsiveness is not used, the binder solution having a high responsiveness can be used to quickly generate a uniform aqueous solution of the binder. Therefore, in the present embodiment, when the concentration of the binder aqueous solution added to the raw material is changed in accordance with the fluctuation of the raw material moisture or the raw material input amount, the concentration of the binder aqueous solution is controlled quickly and with high precision, as in the method of FIGS. 2 and 3. There is no time delay.

Therefore, the kneading machine 50 which concerns on this embodiment responds immediately to the raw material conveyance amount and raw material moisture which change every time, and adjusts the density | concentration and addition amount of the binder aqueous solution added with respect to iron ore raw material with high precision, The aqueous binder solution can be kneaded. As a result, the kneaded product produced by the kneader 50 may be in a slurry state due to excessive binder, or the granularity may not be degraded due to the excessive binder, thereby ensuring proper granulation conditions. Therefore, the assembly property in the granulation process in the granulators 24 and 35 of the rear end can be improved, and granulation quality can be maintained uniformly. As described above, according to the present embodiment, the kneading and the assembling process can be continued while maintaining the proper granulation conditions irrespective of the fluctuation of the raw material conveyance amount and the raw material moisture, so that the raw material moisture can be eliminated without causing equipment shutdown problems. It can cope with a change and a change of the raw material throughput precisely. As a result, a high quality granulated material can be manufactured stably, and the sintering manufacturing process in the sintering machine 40 can be stabilized.

In addition, according to the present embodiment, the binder aqueous solution is not discharged from the mixing nozzle 70 with respect to the iron ore raw material 57 before being fed into the kneader 50, not from the body portion 52 of the kneader 50. Spray directly. Therefore, even if the fixing layer 4 (refer FIG. 1) is formed in the inner peripheral surface of the body part 52 of the kneader 50, it can prevent that spraying of a binder is inhibited by the said fixing layer 4, Since the binder aqueous solution of uniform density | concentration can be added uniformly with respect to the iron ore raw material 57 before injection | throwing-in, the uniform kneading in the kneading machine 50 is attained.

In addition, the residence time of the iron ore raw material in the kneader 50 is usually a short time of at least 3 minutes, and in this short time, it is necessary to uniformly mix the binder aqueous solution of uniform concentration to the entire iron ore raw material. In this embodiment, when adding the binder aqueous solution in the kneader 50, since the binder aqueous solution of uniform density | concentration is knead | mixed by spraying uniformly with respect to the whole iron ore raw material thrown in by the mixing nozzle 70, even in the said short time, The binder aqueous solution and the iron ore raw material can be sufficiently mixed.

In addition, when assembling the iron ore raw material mainly composed of fine powder, it is necessary to reliably knead the binder and the iron ore raw material in a kneader before assembly before putting the kneaded material into the granulator. In the binder addition method of Patent Document 1, the binder and the additive water are sprayed separately in a granulator (drum mixer). However, when the binder and the additive water are sprayed separately, a binder having a uniform concentration can be uniformly added to the raw material. none. In this respect, the binder addition method according to the present embodiment can be suitably applied to the kneader 50 for sufficiently kneading the iron ore raw material mainly composed of fine powder as the front end of the granulation step.

In addition, the binder used by this embodiment used the polyacrylic-acid dispersing agent which can maintain the dispersibility of the fine powder (fine particle) in iron ore raw material high, in order to improve granulation property. The binder addition method which concerns on this embodiment is applicable suitably to the binder (assembly processing agent) containing the polyacrylic-acid dispersing agent. That is, since the binder of uniform density | concentration can be added uniformly to a raw material, the effect which disperse | distributes the fine powder of an iron ore raw material by a binder, and adheres fine powder around nucleus particle (assembly) can be improved. Therefore, iron ore raw materials containing fine powder can be granulated (pseudo-granulated or pelletized) very suitably, and granules having an appropriate particle size (for example, about 10 to 10 mm in particle diameter) can be produced very suitably. Can be.

As mentioned above, although highly preferred embodiment of this invention was described in detail, referring an accompanying drawing, this invention is not limited to this example. If it is a person with ordinary knowledge in the field of the technology to which this invention belongs, it can be clear that various changes or correction examples can be conceived within the range of the technical idea described in the claim, and also about these Of course, it will be understood that it belongs to the technical scope of this invention.

For example, in the said embodiment, the binder addition apparatus and addition method of this invention are applied to the kneading machine 23 and 34 provided in the pseudo assembly line 20 and pellet assembly line 30 of the sintering installation shown in FIG. Although the example which was mentioned was demonstrated, this invention is not limited to this example. The binder addition apparatus and the addition method of this invention are adaptable to the arbitrary kneader which knead | mixes steel raw materials, such as iron ore raw materials, in addition to the said kneaders 23 and 34. FIG.

Further, in the above embodiment, the binder raw solution and the added water are mixed by the mixing nozzle 70 to produce a binder aqueous solution having a desired concentration. However, for example, the binder solution and water previously diluted to a predetermined concentration are mixed to a desired amount. You may produce the binder aqueous solution of the density | concentration mentioned.

In addition, the structure of the mixing nozzle 70 is not limited to the example shown in FIG. 6 and FIG. 7, It can change a design into arbitrary structures as long as it can mix a binder and addition water uniformly.

<Examples>

(Example 1)

As shown in FIG. 5, the Example using the mixing nozzle shown in FIG. 6 using the kneading machine provided with a binder addition apparatus is shown below. The iron ore raw material to be put into the pellet granulation line was granulated using an average of 200 dry-ton / h, an average moisture content of 8%, and a polyacrylic acid-based dispersant as a binder. (At this time, the iron ore raw material and the raw material moisture ratio are represented as average values, respectively, as described above, although the iron ore raw material is quantitatively cut out from the raw material tank, but a slight amount of variation occurs in practice. This is because it fluctuates depending on the raw material blending ratio.)

As a result of the granulation under these conditions, the control delay of the binder concentration caused by the binder aqueous solution remaining in the piping generated in the existing equipment shown in FIG. 3 is eliminated, and it can be supplied as the set value. Therefore, even at a high concentration where the binder solid content ratio Rs is 0.2%, the operation can be continued stably and a granulated product having an appropriate particle size and strength can be produced.

(Example 2)

Except having used the mixing nozzle shown in FIG. 7 in this invention, even when it tested on the same conditions as Example 1, even in the high concentration which binder solid content ratio Rs is 0.2%, it does not generate | occur | produce a slurry and it is stably. Operation was continued and the granulated material of suitable particle size and strength was able to be manufactured.

(Comparative Example)

In the existing equipment shown in Fig. 3, in the same manner as in Example 1, an average of 200 dry-ton / h of iron ore raw material to be put into the pellet assembly line, an average of 8% of raw material moisture ratio, and a polyacrylic acid-based dispersant are used as binders. Assembly was performed. In this case, even when the binder solid content Rs was 0.1%, there were many serious problems due to the slurry generation, and the control delay of the binder concentration caused by the binder aqueous solution remaining in the pipe was an important problem.

&Lt; Industrial applicability >

It can be seen that the present invention can be used in the assembling process of iron ore raw materials in the steel manufacturing process, for example, as described above, for example, assembling the iron ore raw materials. In addition, this invention is not limited to the assembly of an iron ore raw material, It is applicable to the assembly of other materials.

4 fastening layer
23, 34, 50 kneader
52 body parts
53 stirring wings
54 axis of rotation
55 Raw Material Input
56 Carrier
57 Iron Ore Raw Materials
61 flow control valve
62 electromagnetic flow meter
63 Binder Supply Piping
64 flow control valve
65 electromagnetic flow meter
66 water supply piping
70 mixing nozzle
71, 81 and other nozzles
72, 82 nozzles
74 inlet
75, 85 nozzle sphere
76, 86 nozzle sphere
84 opening
87 connector
88 flange
90 spray nozzles
B Binder Stock
W addition water
M binder aqueous solution

Claims (22)

In the assembling of the iron ore raw material, a mixing nozzle which mixes the binder and the water separately supplied by the binder supply pipe and the water supply pipe and opens at the same time, is installed near the raw material input portion of the iron ore raw material kneader. And a binder aqueous solution in which the binder and the water are mixed from the mixing nozzle with respect to the iron ore raw material introduced into the raw material input portion of the kneader. The said mixing nozzle is a double structure which consists of an outer nozzle and an inner nozzle provided in the said outer nozzle, The said binder supply piping is connected to either the said outer nozzle or the said inner nozzle, The other The water supply pipe is connected to a nozzle, and sprays the water supplied by the water supply pipe to the binder supplied into the outer nozzle by the binder supply pipe, thereby forming the binder and the binder in the outer nozzle. The binder is mixed with the water to generate the binder aqueous solution, and the binder aqueous solution is sprayed onto the iron ore raw material from the nozzle mouth of the outer nozzle. 3. The binder supply pipe of claim 2, wherein the binder supply pipe is connected to an inlet formed through a side surface of the outer nozzle, the water supply pipe is connected to communicate with the inner nozzle, and is connected to the outer nozzle from the inlet of the outer nozzle. The binder addition method according to claim 1, wherein the water is mixed with the binder to generate the binder aqueous solution by spraying the water from the nozzle sphere of the inner nozzle with respect to the discharged binder. The said water supply piping is connected to the opening formed in the side surface of the said outer nozzle, The said binder supply piping is connected so that it may communicate with the said inner nozzle, The inside of the said outer nozzle is carried out from the nozzle opening of the said inner nozzle. And the water is mixed with the binder to spray the water from the opening of the outer nozzle in the discharged binder, thereby producing the binder aqueous solution. The binder addition method according to any one of claims 1 to 4, wherein the binder is a polyacrylic acid-based dispersant. The flow rate of at least one of the binder supply pipe or the water supply pipe according to any one of claims 1 to 4, depending on the water contained in the iron ore raw material or the amount of the iron ore raw material input to the kneader. Binder addition method characterized in that for controlling. 6. The binder addition according to claim 5, wherein the flow rate of at least one of the binder supply pipe or the water supply pipe is controlled according to the water contained in the iron ore raw material or the amount of the iron ore raw material input to the kneader. Way. In the granulator of an iron ore raw material, Binder supply piping which supplies a binder. A water supply pipe for supplying water is installed near the raw material inlet of the kneader of iron ore raw material, and the outlet side is opened while mixing the binder and the water separately supplied by the binder supply pipe and the water supply pipe. And a mixing nozzle, wherein the mixing nozzle sprays the binder aqueous solution generated by mixing the binder and the water with respect to the iron ore raw material introduced into the raw material input portion of the kneader. The said mixing nozzle is a double structure which consists of an outer nozzle and the inner nozzle provided in the said outer nozzle, The said binder supply piping is connected to either the said outer nozzle or the said inner nozzle, The other The water supply pipe is connected to a nozzle, and sprays the water supplied by the water supply pipe to the binder supplied into the outer nozzle by the binder supply pipe, thereby forming the binder and the binder in the outer nozzle. Mixing the water to produce the binder aqueous solution, and the binder aqueous solution is sprayed on the iron ore raw material from the nozzle sphere of the outer nozzle. The said binder supply piping is connected to the inflow port formed in the side surface of the said outer nozzle, The said water supply piping is connected so that it may communicate with the said inner nozzle, The said inside of the said outer nozzle from the inflow port of the said outer nozzle is made. The aqueous binder is added to the discharged binder by spraying the water from the nozzle sphere of the inner nozzle to produce the binder aqueous solution by mixing the water with the binder. The said water supply piping is connected to the opening formed in the side surface of the said outer nozzle, The said binder supply piping is connected so that it may communicate with the said inner nozzle, The said nozzle is provided in the said outer nozzle from the nozzle opening of the said inner nozzle. The binder addition apparatus characterized by mixing the said water with the said binder and spraying said water from the said opening of the said outer nozzle with respect to the discharged said binder, and producing the said binder aqueous solution. The binder addition apparatus according to any one of claims 8 to 11, wherein the binder is a polyacrylic acid-based dispersant. The flow rate according to any one of claims 8 to 11, wherein the flow rate of at least one of the binder supply pipe or the water supply pipe is changed according to the water contained in the iron ore raw material or the input amount of the iron ore raw material to the kneader. Binder addition apparatus characterized by further comprising a control unit for controlling. 13. The control apparatus according to claim 12, further comprising a control unit for controlling at least one of the binder supply pipe and the water supply pipe according to the water contained in the iron ore raw material or the amount of the iron ore raw material to the kneader. A binder addition apparatus to be used. The kneading machine provided with the binder addition apparatus in any one of Claims 8-11. The kneading machine provided with the binder addition apparatus of Claim 12. The kneading machine provided with the binder addition apparatus of Claim 13. The kneading machine provided with the binder addition apparatus of Claim 14. The iron ore raw material is kneaded in the kneader while spraying an aqueous binder solution with respect to the iron ore raw material introduced into the raw material input portion of the kneader using the binder addition device according to any one of claims 8 to 11. The kneading method characterized by the above-mentioned. A kneading method characterized by kneading the iron ore raw material in the kneader while spraying an aqueous binder solution with respect to the iron ore raw material introduced into the raw material input portion of the kneading machine using the binder adding device according to claim 12. A kneading method characterized by kneading the iron ore raw material in the kneader while spraying an aqueous binder solution with respect to the iron ore raw material introduced into the raw material input portion of the kneading machine using the binder adding device according to claim 13. A kneading method, wherein the iron ore raw material is kneaded in the kneader while spraying an aqueous binder solution with respect to the iron ore raw material introduced into the raw material input portion of the kneader using the binder addition device according to claim 14.

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