JP5928731B2 - Manufacturing method and apparatus for granulating raw material for sintering - Google Patents

Description

  The present invention relates to a method for producing a granulation raw material for sintering used in a DL type sintering machine and a production apparatus therefor.

  The sintered ore used as the blast furnace raw material is obtained by mixing and granulating powdered iron ore and other raw materials, and charging the obtained granulated material into a sintering machine to sinter. In the above granulation, moisture is added to the blended raw material, and the granular materials are aggregated together to form pseudo particles. The presence of the quasi-particles effectively acts to ensure air permeability when charged on a pallet of a DL-type sintering machine and sintered, thereby contributing to smooth progress of the sintering.

In recent years, iron ore used as a sintering raw material has been prone to lower grades due to depletion of high-quality iron ore, such as an increase in slag components and pulverization. There is concern about a decline in sex. On the other hand, from the viewpoint of reducing hot metal production cost in a blast furnace and reducing CO ₂ generation, sintered ore used in a blast furnace is required to have a low slag ratio, high reducibility, and high strength.

  In such a situation surrounding iron ore for sintering raw materials, difficult granulation for pellet production called pellet feed (about 63 μm) having a smaller particle size than powder ore called about sinter feed (about 125 to 1000 μm) A technique for producing high-quality sintered ore by using fine pulverized iron ore has been proposed. For example, one of such conventional techniques is a hybrid pelletized Sinter method (hereinafter referred to as “HPS”). This technology mixes and granulates a blended raw material containing a large amount of finely divided iron ore such as pellet feed and difficult-to-granulate finely divided iron ore such as tailing ore into a pseudo particle by using a drum mixer and pelletizer, It is intended to produce a sintered ore with low slag ratio and high reducibility by sintering using the pseudo particles (Patent Document 1, Patent Document 2, Patent Document 3, Patent Document 4, Patent Document). 5).

Japanese Patent Publication No.2-4658 Japanese Patent Publication No. 6-21297 Japanese Patent Publication No. 6-21298 Japanese Patent Publication No. 6-21299 Japanese Patent Publication No. 6-60358

  However, when a raw material containing a large amount of fine iron ore such as pellet feed is granulated, moisture is preferentially absorbed by the fine iron ore, so only the fine particles aggregate with each other, and the bond strength contains a large amount of fine iron ore. There was a problem that coarse coarse pseudo particles were generated. The reason for this is that, if the fine iron ore has the same wettability, the finer powder having a larger specific surface area is more likely to absorb moisture and retain more moisture between the powders.

  When coarse pseudo-particles with low bond strength are generated, as shown in FIG. 1 (a), the particle size is uneven and the particle size distribution becomes large, so that when packed on a sintering machine, a dense packed structure is formed. Density increases. In addition, the coarse quasi-particles having such a low bond strength are easily compressed and deformed in the quasi-particle packed layer formed when charged on the pallet of the sintering machine. This lowers the porosity of the steel, and as a result, deteriorates the air permeability and becomes an impediment to the operation of the sintering machine. In addition, the amount of quicklime, which is a binder used for granulation, must be increased, resulting in an increase in production cost of sintered ore.

  It is known that a pre-granulation technique should be adopted for such a problem. For example, when granulating a sintered raw material powder having a particle size of 0.5 mm or less of 30 mass% or more, the raw material is mixed while giving a shearing force without being substantially crushed. A pretreatment method for a sintering raw material in which the water content of the raw material is 6.5 to 10.0% has been proposed (Japanese Patent No. 2790008).

  This method uses a mixer with a built-in stirring blade to apply a shearing force rather than crushing iron ore powder, and to promote the homogenization of moisture, thereby achieving a uniform particle size distribution. is there. However, in the method using the mixer, there is a problem in that it is necessary to perform this treatment on all blended raw materials charged in the mixer, resulting in various adverse effects. Furthermore, since granulation is performed after mixing while giving a shearing force without crushing, coarse powders (aggregated particles) with weak bonding strength, in which fine powders are merely agglomerated, may be formed. It was insufficient for the solution.

  Therefore, the present invention provides a coarse pseudo-particle having a weak bond strength in which fine particles and fine powder are aggregated (a pseudo aggregate that is merely agglomerated), even in the case of using hardly granulated fine iron ore during granulation. A technique capable of granulating pseudo particles having a uniform size, preferably centering on core particles, is proposed.

That is, as shown in FIG. 1 (b), the present invention is preferably a pseudo particle (sintering structure) having a structure in which powder is adhered around the core particle and having a relatively uniform particle size distribution. Aiming to manufacture grain raw materials). Such particles will exhibit good breathability when loaded on the pallet of the sintering machine. Furthermore, the present invention improves the strength and productivity of sintered ore by improving combustion efficiency and melt generation conditions by producing sintered ore using such a granulating raw material for sintering. Thus, a technique is proposed that can reduce the hot metal production cost and the amount of CO ₂ generated from the blast furnace.

  FIG. 2 shows not only powdered iron ore (sinter feed), which is a conventional sintering raw material (average particle size: a particle size of about 1000 μm indicating 50% in the cumulative frequency distribution), but also an average particle size of 63 μm or less. It shows the particle size distribution of fine powder (pellet feed) and ultrafine powder (tailing ore) of 5 μm or less. The present invention is a proposal for utilizing not only sintering feed but also pellet feed and tailing ore as sintering raw materials.

  In general, when granulating a raw material containing difficult-to-granulate fine iron ore (-63 μm) such as pellet feed, coarse pseudo particles with weak bonding strength due to aggregation of powder, fine powder, and ultrafine powder. Is easier to generate. Such pseudo particles often have a large particle size distribution and deteriorate the air permeability of the raw material packed layer on the pallet during operation of the sintering machine. Therefore, the present invention aims to develop a technology that can overcome such problems. As a method for this, in the present invention, coarse pseudo particles having a low bond strength are obtained by continuing granulation while carrying out stirring and mixing with only a large drum mixer (hereinafter referred to as “pulverization granulation”). Has succeeded in developing a method for producing pseudo particles having a relatively small particle size distribution and a high bond strength.

  That is, the present invention selectively grinds coarse pseudo-particles with low bond strength generated during granulation in a stirring and mixing-granulation process using one large drum mixer as soon as possible. This is the method of continuing the original granulation process. That is, the blended raw material grows and spheroidizes in the drum mixer due to the aggregation of fine particles due to liquid interposition (crosslinking), and in the process, the surface layer portion of the raw material that flows in the drum (near the axis center) Since a lot of coarse particles are preferentially generated and unevenly distributed in the vicinity, a small crusher equipped with stirring blades is inserted in this position in parallel to the drum axis direction, and the latter half of the raw material movement time is By selectively crushing pseudo particles coarsened in the first half of the drum axis direction except the fine powder and fine particles generated by the crushing are directly subjected to re-granulation in the drum mixer. It is the method of using as a granulation raw material for ligation.

  The present invention provides a drum mixer for a raw material of a sintered compounding material when granulating the material while rolling and stirring the material in the drum while moving the sintered compounded material along the longitudinal direction in the drum mixer. We propose a method for producing a granulated raw material for sintering, characterized in that, in the first half of the internal movement time, a crushing action is applied to the pseudo particles staying in the surface layer portion of the rolling raw material layer.

The present invention is a production apparatus comprising a drum mixer for mixing and granulating sintered raw material powder, and in the longitudinal direction of the drum mixer, the pulverization adjustment is the first half of the movement time of the charged raw material in the drum In the grain region , a horizontal crusher is provided along the surface of the raw material layer in the drum axis direction, with a large number of stirring blades protruding from the surface of the rotating shaft from the raw material charging side of the drum mixer. And the manufacturing method of the granulation raw material for sintering characterized by the latter half part following the crushing rectification area | region being the granulation area | region without a crushing effect | action is proposed.

A more preferable solution of the present invention is as follows:
(1) the pseudo particles of the solution 砕対 elephant, it particle size is the particle element of size greater than 8 mm,
( 2 ) The pseudo particles to be crushed are particles produced by agglomeration of fine particles and / or fine particles with each other through moisture,
(3) In the crushing operation, a horizontal crusher formed by projecting a plurality of stirring blades on the shaft surface from the raw material charging side of the drum mixer to a position substantially in the middle of the entire drum length is arranged in the drum axial direction. Causing the stirring blade to be inserted and disposed along the surface of the raw material layer and bringing the rotating stirring blade into contact with the pseudo particles on the surface of the raw material layer;
(4) The horizontal crusher is disposed at a position eccentrically downward in the radial direction from a drum shaft center of a drum mixer, and rotates in a direction opposite to the rotation direction of the drum. 4. A method for producing a granulating raw material for sintering according to 4 .

(1) According to the present invention, it becomes possible to use a large amount of hardly granulated fine iron ore such as pellet feed as iron ore for a sintering raw material, and still has high reducibility and high A strong sintered ore can be produced advantageously.
(2) Moreover, according to this invention, since the intensity | strength of the product sintered ore manufactured can be raised and a yield can be improved, reduction of the amount of powder coke used is attained. Further, since the amount of coke in the formulation in the raw material is reduced, which contributes to the reduction of CO ₂ emissions during sinter production.
(3) Furthermore, according to the present invention, since the amount of binder used when granulating fine iron ore can be reduced, the production cost of sintered ore can be reduced.

It is a comparison figure of the conventional particle deposition layer (a) and the particle deposition layer (b) of this invention. It is a comparison graph of the average particle diameter of a fine ore, a fine ore, and a super fine ore. It is a schematic diagram of the structure (a) and (b) of pseudo particles. It is a comparison graph of the particle size distribution of the pseudo particle in the presence or absence of fine iron ore blending. It is a figure explaining the stirring granulation time of the charging raw material in a drum mixer. It is a graph which shows the relationship between the stirring crushing position at the time of a granulation test, and granulated particle average diameter. It is a graph which shows the relationship between the stirring crushing position at the time of a granulation test, and an equal number. It is a graph which shows the relationship between the stirring crushing position at the time of a granulation test, and an air permeability index. It is a graph which shows the relationship between the stirring crushing position at the time of a granulation test, and a yield. It is a graph which shows the relationship between the stirring crushing position at the time of a granulation test, and sintering time. It is a graph which shows the relationship between the stirring crushing position at the time of a granulation test, and a production rate. It is a schematic diagram which shows an example of the granulation raw material manufacturing process for sintering which concerns on this invention. It is a basic diagram of the manufacturing apparatus (drum mixer type | mold crushing granulation apparatus) of the granulation raw material for sintering which concerns on this invention. It is a comparative photograph of the conventional method (b) and the invention method (c) showing the state of granulation (a) and crushing in a drum mixer.

  FIGS. 3A and 3B are schematic diagrams showing the structural features of pseudo particles, which are granulation raw materials for sintering. In such a general conventional granulated raw material manufacturing process for sintering, such pseudo particles are first mixed with iron ore powder and auxiliary raw material powder cut out from the mixing tank in the drum mixer 2 and then mixed. The blended raw material is fed to a granulator such as a pan pelletizer and granulated. In the mixing step and the granulating step, water is added, and the humidity is adjusted so as to obtain predetermined granulated moisture, thereby forming predetermined pseudo particles.

On the other hand, in the present invention, as shown in FIG. 12, instead of producing a conventional granulating raw material for sintering comprising a mixing step by a drum mixer and a granulating step by a pan pelletizer, a large drum having a long drum length is preferable. A method and apparatus for performing both the mixing step and the granulating step with only one drum mixer is proposed. In particular, the first half of the total movement time of the blended raw material charged in the drum mixer is subjected to the stirring and crushing process accompanied by the crushing action by stirring and mixing, and the regular granulation process is performed in the latter half part thereafter. it is characterized by a row of cormorants point.

Therefore, in the present invention, a crusher formed by projecting a large number of stirring blades in the radial direction from the surface of the rotating shaft is disposed in the first half part (approximately half of the total moving time of the raw material) in the drum mixer. In the surface layer portion of the raw material (fluidized) layer in the drum, fine particles and / or fine particles agglomerated with each other through moisture, especially a certain size or more of coarse particles The target is to crush this and make it sized. For example, large pseudo particles appearing in the surface layer on the axial center side of the raw material (fluidized) layer staying in the drum mixer, for example, having a particle diameter of 8 mm or more, in the first half of the drum charging, This is a method of performing pulverization granulation in which pseudo particles in the surface layer portion of the raw material (fluidized) layer in which these are accumulated are pulverized through the pulverizer and then granulated.

  The reason for this idea is as follows. That is, pseudo-particles when granulated by blending fine iron ore such as pellet feed in addition to fine iron ore (sinter feed), for example, as apparent from the particle size distribution shown in FIG. Pseudoparticles containing 40 mass% of pellet feed) increase in fine particles and at the same time increase coarse particles. In addition, as described above, in many cases, the coarse particles are simply agglomerated fine powders, and since the bond strength is weak, the coarse particles are easily pulverized during the sintering process, resulting in air permeability failure. Since it is easy, it is necessary to eliminate it.

  In this regard, in the present invention, when a crusher is disposed in a drum mixer, coarse pseudo-particles having a low bond strength can be easily crushed because of containing a large amount of fine iron ore. A phenomenon that can be changed to pseudo particles having a strong bond strength and a uniform particle size distribution with a small particle size distribution was used. The surface of the quasi-particle is coated with a solid fuel such as coke powder or a secondary raw material used as necessary by another drum mixer or the like, and is used as a raw material for sinter production. It is good also as a grain raw material.

Therefore, in order to confirm this, the inventors used a blended raw material obtained by blending fine iron ore (pellet feed: 63 μm or less) in addition to fine iron ore (sinter feed: average particle size of 3 mm or less). using, in place of the engaging Ru traditional granulation raw material manufacturing apparatus for sintering a combination of a plurality of pan pelletizer and drum mixers, conducted experiments that stirred pulverized and granulated in one drum mixer of disintegrator with It was.

  This experiment is an example in which the entire process of granulating by stirring and mixing with a drum mixer was performed in 300 seconds. FIG. 5 shows the stirring (pulverization granulation) time of the blended raw material charged in the drum mixer together with blending conditions such as fine iron ore (sinter feed: pellet feed: tailing ore = 80 mass%: 16 mass%: 4 mass%), An example divided into 8 levels is shown in the chart.

  According to the results of this experiment, as shown in granulation experiments 1 and 2, when simple stirring, that is, crushing is not performed, as shown in FIG. 6 and FIG. The average particle size of the particles decreased. However, as in Experiments 3 to 5, when only the first half of the granulation time for moving through the drum mixer of the charging raw material was stirred, the coarse particles were crushed, but the overall average particle size was slightly increased. Further, as in Experiments 6 to 8, when the crushing was continued not only in the first half but also in the second half, not only the coarse grains but also the intermediate grains were crushed, and the average particle size was reduced. On the other hand, in the uniform number shown in FIG. 7, when the fine iron ore such as pellet feed or tailing ore is blended as in Experiments 1 to 2, the width of the particle size distribution of the granulated particles increases and the uniform number decreases. . Basically, the tendency was found that the uniform number increased as the agitation was disintegrated. However, it was found that, when stirring and pulverizing until the latter half, the uniform number increases and the granulated particles are sized, but the average particle size of the granulated particles becomes small, so that the air permeability is deteriorated.

  Next, a breathability test was performed. The test results are shown in FIG. As shown in this figure, as in Experiments 1 and 2, when simple granulation is performed without stirring with a drum mixer, a mixture of fine iron ore such as pellet feed and tailing, the average particle size of the granulated particles is Since the size is reduced and the uniform number is reduced, the air permeability of the sintered bed is deteriorated. On the other hand, as in Experiments 3 to 5, when only the first half of the total granulation time by the drum mixer is stirred and pulverized, the coarse particles are crushed, but the average particle size of the whole is increased, and the uniform number is also increased. Therefore, the air permeability is improved. However, as in Experiments 6 to 8, when stirring and pulverizing until the latter half, not only coarse particles but also intermediate particles are crushed, and the uniform number of granulated particles increases, but the small particle size As a result, the air permeability was deteriorated.

  Next, a sintering test was performed. According to this test result, in Experiments 1 and 2, by blending fine iron ore such as pellet feed and tailing ore, the permeability of the sintering bed was deteriorated, but the yield was increased although the sintering time was increased. . On the other hand, when only the first half of the treatment with the drum mixer was stirred and crushed as in Experiments 3 to 5, the air permeability was improved and the sintering time was shortened, but the yield was lowered. On the other hand, as in Experiments 6 to 8, when stirring and crushing until the latter half, not only coarse grains but also intermediate grains are crushed and air permeability deteriorates. Increased to.

  Furthermore, the production rate was also examined in the above sintering test. Even in this case, in the case of Experiments 1 and 2, as a result of blending fine powder raw materials such as pellet feed and tailing, the yield was improved, but the permeability was deteriorated and the sintering time was increased, so the productivity was greatly reduced. . On the other hand, when only the first half of the drum mixer granulation was stirred as in Experiments 3 to 5, the air permeability was improved, the sintering time was shortened, and the productivity was recovered. However, as in Experiments 6 to 8, when the stirring was extended to the second half, the yield was improved, but the air permeability was deteriorated, the sintering time was significantly increased, and the productivity was lowered.

  From the above experimental results, when stirring and crushing and granulation with only one drum mixer, only the first half of the total moving time of the charged raw material is crushing and granulating, and the latter half is It was found that it is effective to simply perform the granulation treatment without crushing.

  Under such knowledge, in the present invention, stirring with crushing was performed only in a partial region (first half portion) by a drum mixer. As a method for this, the above-described coarse pseudo particles are generated. A large number of stirring blades for crushing project from the circumferential surface of the rotating shaft along the surface part (axial center side) of the fluidized fluidized bed in the drum mixer 3 in the first half of the material movement time ratio that tends to be unevenly distributed. It was decided to arrange the crushers made in parallel to cope. Then, the rotating shaft and the stirring blade of the crusher are rotated, and desirably, the coarse pseudo particles are stirred and mixed while being crushed, and further granulated toward the latter half of the axial direction of the drum mixer. Therefore, it was decided to use pseudo particles having a suitable particle size.

  In this case, the sintered blended raw material in the drum mixer is granulated while adding moisture for granulation in the drum mixer main body rotating counterclockwise. At the portion corresponding to the first half of the moving time, the coarse pseudo particles are crushed by the stirring blades of the pulverizer and are regranulated while being mixed with the uncrushed powder and granular materials while being crushed. , Pseudo particles with relatively uniform particle sizes are generated. The pseudo particles having an appropriate particle size generated in this way are discharged onto the belt conveyor from the discharge end of the drum mixer.

  In the present invention, coarse pseudo-particles having a low bond strength mainly containing fine iron ores, which are targets of crushing and granulating, are simply formed by agglomeration of high-moisture fine particles and fine particles. By making use of this, the particle size is increased, and since the strength is weak, it can be easily crushed. If such coarse quasi-particles with low bonding strength are deposited on the pallet of the sintering machine with a certain layer thickness, they are easily crushed when a load (compression force) is applied to the quasi-particles, It becomes a sintered granulated raw material layer having a filling structure with a small porosity. As a result, the granulated raw material layer on the pallet has poor air permeability and becomes an impediment to the operation of the sintering machine.

  The crushing position by the crusher in the drum mixer 3 is a position where the coarse pseudo particle surface portion is unevenly distributed in the first half part on the raw material charging side as shown in FIGS. Since this position varies depending on the particle size and components of the blended raw material, the blending amount, and the amount of granulating water, it is preferably changed as appropriate.

  Next, an apparatus for producing a raw material for sintering used in the above method according to the present invention will be described with reference to FIGS. The above manufacturing apparatus according to the present invention requires a sintering raw material cut out from the mixing tank 1, that is, a mixing raw material composed of fine iron ore, fine iron ore, and other raw materials (sintered steel, quicklime, silica, etc.) The main part is a drum mixer 2 of large size 4 to 5 mφ, 10 to 25 mL as shown in the figure, which performs a series of processes of stirring and mixing in the state of granulated moisture (6 to 7.5%) and granulating. To do.

  The drum mixer 2 includes a crusher 3 having a large number of crushing stirring blades 3b projecting radially from the circumferential surface of the rotary shaft 3a along the axial direction (longitudinal direction) from the raw material charging side. It is constituted by a material arranged in parallel with the axial direction from the raw material charging side.

That is, especially during the first half of the total moving time (about 300 sec) during the movement of the tip of the stirring blade 3b from the raw material charging side toward the granulated raw material discharging side while flowing in the drum ( The crusher 3 is disposed in a range (a sizing area) over 150 sec). And the front-end | tip of this stirring blade 3b is arrange | positioned so that especially the coarse pseudo-particle may be unevenly distributed in the surface layer part 4a of the raw material fluidized bed 4 which flows through the inside of this drum. As a result, the pseudo particles having low bonding strength in the surface layer portion 4a are crushed, and when the latter half (granulation region) is reached, the crushed powder / granular material is entrained and granulated again. Continued activities and granulated to the proper particle size.
In the figure, 5 is a DL sintering machine, 6 is a sintering cooler, and 7 is a conveyor for exterior of limestone or powder coke.

  The main raw materials of the samples used in this example are Australian iron ore 50 mass% and South American iron ore 50 mass%. The blending raw material is based on a basicity of 2.0. For example, when 20 mass% of fine iron ore as pellet feed is blended, the above blending ratio (1: 1) of Australian iron ore and South American iron ore remains unchanged. We corresponded by changing to. In addition, as the fine iron ore, tailing ore can be used, and the behavior as fine powder is the same even if a normal blending raw material is used as it is. Here, the tailing ore represents a residue generated in the process of producing a pellet feed.

  Since the distribution position of the pseudo particles having a weak binding force in the drum mixer 2 varies depending on the raw material conditions and the operation level, setting of the crushing position by external monitoring is effective. In particular, it is possible to control the particle size of coarse pseudo particles to be crushed by adjusting the clearance between the tip of the stirring blade 3b and the inner peripheral surface of the drum. Therefore, a thickness measuring device such as the laser displacement meter is provided to cope with this, but the size of the pseudo particles to be crushed can be adjusted by this adjustment, and the size of the final pseudo particles granulated can be adjusted. Is determined.

  Moreover, in the manufacturing process of the granulating raw material for sintering in this embodiment, the granulated moisture added to the first half of the drum mixer 2 has a base condition of 7.6 mass%, and is 8. It was set to 2 mass%. The dwell time in the drum mixer 2 was set to the same conditions as in the actual machine, and the rotation speed was set so that the fluid number (inertial force / gravity) was constant.

That is, the number of rotations (counterclockwise) of the drum mixer 2 (diameter: 1.4 m, length 8 m) is 10 rpm, and the crusher 3 has a rotation number: 250 rpm, a stirring blade number: 10, blade height: 300 mm. The crusher of was used. It is disposed from the charging side of the blended raw material fluidized bed 4 in the drum mixer 2 and is set at the position of the surface layer portion 4a that deviates from the axial center of the drum radial direction where many coarse pseudo particles are present visually. I did it. The rotation direction of the stirring blade 3b was opposite to the rotation direction of the drum mixer 2 in order to prevent the raw material from being circulated. Further, the clearance between the tip of the stirring blade 3b and the inner peripheral surface of the drum mixer 2 was set to about 8 mm in order to efficiently crush coarse particles having a particle size of 8 mm or more. As a result, the coarse pseudo-particles having a particle diameter of 8 mm or more were crushed and could be used for re-granulation.

  FIG. 14 is an appearance photograph (a) of the pseudo particles during rolling inside the drum mixer, and the state of the particles being granulated in the vicinity of the surface layer portion of the mixed raw material fluidized bed is photographed with a high-speed camera. (B) and (c) in the figure are comparative photographs of the conventional method (b) and the present method (c). As shown in this figure, with the rotational movement of the drum mixer 2, the charged raw materials are constantly flowing and contact each other, lifted to an upper position on the inner peripheral surface of the drum mixer, and eventually lowered by its own weight. Growing gradually into large particles while repeating the falling motion. In this movement, the position where the ungranulated powder and pseudo particles start to fall is that the higher the rotational speed of the drum mixer, the greater the adhesion of the blended raw material, and the smaller the tilt angle of the drum mixer, Was found to be higher.

  If a sintered ore is manufactured using the granulation raw material for sintering manufactured based on this invention method, the improvement effect of the yield of a sintered ore or the intensity | strength of a sintered ore can also be anticipated. This is because in the conventional method, powder coke is coated on pseudo particles with non-uniform particle size, so that combustion and heat reception become non-uniform and yield decreases, but it was manufactured by applying the present invention. In the case of a granulated raw material for sintering, since the particle size becomes relatively uniform, the existence state of the powder coke is also optimized. In addition, when not implementing external granulation of powder coke, uniform mixing before granulation is necessary to achieve uniform mixing of powder coke and limestone, but in the case of the present invention, such a burden is reduced. The

  The method (crushing granulation) according to the present invention does not require an additional line for crushing, and has a simple equipment configuration in which a crusher with stirring blades is simply installed in an existing large drum mixer. Become.

  The drum mixer with a crusher of the present invention can be applied not only as a granulating raw material for sintering but also as a technique for producing agglomerated ores for blast furnaces.

DESCRIPTION OF SYMBOLS 1 Mixing tank 2 Drum mixer 3 Crusher 3a Rotating shaft 3b Stirring blade 4 Raw material fluidized bed 4a Surface layer part of raw material fluidized bed 5 Sintering machine 6 Sintering cooler 7 Exterior conveyor

Claims (7)

While moving the sintered blending raw material along the longitudinal direction in the drum mixer, when rolling the raw material in the drum and granulating it while stirring,
The granulated raw material for sintering is characterized by adding a crushing action to the pseudo particles staying in the surface layer portion of the rolling raw material layer in the first half of the moving time of the sintered mixed raw material in the drum mixer. Production method. Solution 砕対 elephant the pseudo particles, method for producing a sintered granulating material according to claim 1, wherein the particle size is the particle element of size greater than 8 mm. 3. The granulated raw material for sintering according to claim 1, wherein the pseudo particles to be crushed are particles formed by agglomerating fine particles and / or fine powders with each other through moisture. Manufacturing method . In the crushing action, a horizontal crusher having a plurality of stirring blades projecting from a shaft surface between a raw material charging side of the drum mixer and a position substantially in the middle of the entire length of the drum is connected to the raw material layer in the drum axial direction. The sintering according to any one of claims 1 to 3, wherein the sintering blade is inserted and disposed along the surface, and is caused by bringing the rotating stirring blade into contact with the pseudo particles on the surface portion of the raw material layer. Method for granulating raw materials. The horizontal disintegrator is disposed at a position eccentric in the radial direction of the downwardly from the drum shaft center of the drum mixer, according to claim 4, wherein it is the direction of rotation of the drum is to rotate in the opposite direction Method for granulating raw material for sintering. A manufacturing apparatus comprising a mixing and granulating drum mixer of the sintering raw material powder, in the longitudinal direction of the drum mixer, the solution砕整grained region is the first half part of the drum moving time of charging raw materials , from the raw material charging side of the drum mixer, a number of stirring blades horizontal disintegrator formed by projecting from the axial surface of the rotary shaft is disposed along the material layer surface of the drum axis, and solutions thereof An apparatus for producing a granulating raw material for sintering, characterized in that the latter half portion following the crushing rectification zone is a granulation zone having no crushing action . The horizontal disintegrator is disposed from the drum axis center of the drum mixer at a position eccentric in the radial direction of the lower, according to claim 6, wherein it is the direction of rotation of the drum is to rotate in the opposite direction Equipment for granulating raw materials for sintering.