CN104911337B - A kind of sintering raw material composition and basic vanadium-titanium sintered ore and its preparation method and application - Google Patents

Abstract

The present invention relates to the technical field of vanadic-titanomagnetite sintering, specifically discloses a kind of raw materials for sintering composition and alkaline vanadium-titanium magnitite sinter and its preparation method and application.The raw materials for sintering composition contains sea sand v-ti magnetite concentrate powder, active lime, silica and fuel, on the basis of the gross weight of the raw materials for sintering composition, the content of the sea sand v-ti magnetite concentrate powder is 86 89 weight %, the content of the active lime is 57 weight %, the content of the silica is 12 weight %, and the content of the fuel is 4.5 5 weight %.The preparation method of the alkaline vanadium-titanium magnitite sinter includes：(1) by above-mentioned raw materials for sintering composition, return mine with water carry out mixing system material, obtain compound；(2) step (1) described compound is subjected to cloth and sintering successively.The property indices of alkaline vanadium-titanium magnitite sinter provided by the invention are more excellent, and disclosure satisfy that blast furnace process furnace retaining sintering deposit enters stove performance requirement, significant to the long service life of blast furnace.

Description

A kind of sintering raw material composition and basic vanadium-titanium sintered ore and its preparation method and application

technical field

The present invention relates to the technical field of vanadium-titanium magnetite sintering, in particular to a sintering raw material composition, a preparation method of basic vanadium-titanium sintered ore, basic vanadium-titanium sintered ore prepared by the method, and the basic vanadium-titanium sintered ore The application of vanadium-titanium sinter as furnace protection sinter in blast furnace smelting.

Background technique

For a long time, the longevity of the blast furnace has been the goal of unremitting efforts and pursuit of ironworkers, and the furnace protection technology of vanadium-titanium ore has also been widely recognized. At present, three methods are usually adopted for titanium ore furnace protection technology: online wire feeding in the blast furnace tuyere area; adding vanadium-titanium lump ore or vanadium-titanium pellets to the blast furnace charge; Proportionally add titanium-containing ore powder.

However, the main problems of the above three titanium ore furnace protection technologies are: the first furnace protection method has a large one-time investment cost and complicated equipment. In theory, this furnace protection method has the best effect. High-titanium powder is put into the eroded area of the furnace hearth at fixed points, so the effect of this furnace protection method is the least obvious in production practice. The second furnace protection method uses titanium-containing lump ore or titanium-containing pellets to protect the furnace, but because the price of titanium-containing lump ore and titanium-containing pellets is generally high, the cost of using this furnace protection method is the highest. The third furnace protection method uses titanium-containing powder ore, which is relatively cheap and low in cost. The method is to mix titanium-containing powder ore with other iron-containing materials to form a mixed material for sintering. In actual production, A pile of mixed material has tens of thousands of tons, which can be used continuously for sintering production for about 10 days. That is to say, before the pile of mixed material is used up, it is difficult for the blast furnace to temporarily change the [Ti] content in the raw material. Therefore, this method has poor flexibility for blast furnace production.

In view of the deficiencies of the existing technology, it is urgent to develop a vanadium-titanium shielded furnace sinter which has simple preparation method, low production cost and can meet the furnace performance requirements of the shielded furnace sinter used in blast furnace smelting.

Contents of the invention

The purpose of the present invention is to solve the above-mentioned problems in the prior art, and provide a sintering raw material composition, a preparation method of basic vanadium-titanium sintered ore, basic vanadium-titanium sintered ore prepared by the method, and the basic vanadium-titanium sintered ore The application of sinter as furnace protection sinter in blast furnace smelting.

In order to achieve the above object, the present invention provides a sintering raw material composition, wherein, the sintering raw material composition contains sea sand vanadium-titanium magnetite concentrate powder, active lime, silica and fuel, and the total weight of the sintering raw material composition As a benchmark, the content of the sea sand vanadium-titanium magnetite concentrate powder is 86-89% by weight, the content of the active lime is 5-7% by weight, the content of the silica is 1-2% by weight, the fuel The content is 4.5-5% by weight.

In addition, the present invention also provides a method for preparing basic vanadium-titanium sintered ore, the method comprising:

(1) Mixing the above-mentioned sintering raw material composition, returning ore and water to obtain a mixture;

(2) Distributing and sintering the mixture described in step (1) sequentially.

The present invention also provides a basic vanadium-titanium sintered ore prepared by the above method.

In addition, the present invention also provides the application of the above-mentioned basic vanadium-titanium sinter as furnace-protecting sinter in blast furnace smelting.

Through the above-mentioned technical proposal, the present invention obtains the basic vanadium-titanium guarded furnace sinter with simple preparation method, low production cost and meeting the furnace performance requirements of the guarded furnace sinter used for blast furnace smelting.

Other features and advantages of the present invention will be described in detail in the detailed description that follows.

detailed description

Specific embodiments of the present invention will be described in detail below. It should be understood that the specific embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

The present invention provides a sintering raw material composition, wherein the sintering raw material composition contains sea sand vanadium-titanium magnetite concentrate powder, active lime, silica and fuel, based on the total weight of the sintering raw material composition, the The content of the sea sand vanadium-titanium magnetite concentrate powder is 86-89% by weight, the content of the active lime is 5-7% by weight, the content of the silica is 1-2% by weight, and the content of the fuel is 4.5- 5% by weight.

In the present invention, controlling the proportioning of sea sand vanadium-titanium magnetite concentrate powder in the range of 86-89% by weight and controlling the proportioning of active lime in the range of 5-7% by weight is beneficial to the basic vanadium-titanium sintered ore The basicity is controlled between 2-3, so as to ensure that the produced basic vanadium-titanium sinter can meet the requirements of blast furnace smelting for the performance index of furnace-protected sinter.

In the present invention, the sea-sand vanadium-titanium magnetite concentrate powder can be derived from sea-sand ore in Indonesia and its surrounding areas. Usually the content of TFe in the sea sand vanadium-titanium magnetite powder can be 57.5-58.5% by weight, the content of FeO can be 29-31% by weight, the content of _TiO2 can be 12-13% by weight and the content of _SiO2 can be 0.5-1% by weight.

The active lime described in the invention can ensure the spheroidization of sintered ore. The active lime, also known as high-reaction lime or soft burnt lime, is a high-purity lime with small bulk density, high porosity (generally above 50%), fine crystallization, high strength, large specific surface area, and It is widely used in the sintering process because of its small amount of sulfur and strong reaction force. In terms of oxides, the content of CaO in the active lime is preferably 85-90% by weight. The activity of the active lime is preferably 280-400mL. In the present invention, the term "activity" used is usually expressed by the reaction rate of lime and water, that is, under standard atmospheric pressure, within 10 minutes, 50g of lime is dissolved in water at a constant temperature of 40°C. The number of milliliters of 4mol/L HCl aqueous solution consumed.

The inventors of the present invention have found through research that both the composition and particle size composition of silica have a great influence on the quality of sintered ore. In order to strengthen the granulation effect of the sintering process and increase the amount of binder phase in the sintering process, thereby helping to improve the yield and quality of the sintered ore, preferably, the content of SiO in the silica accounts for 90-95 _% by weight; more preferably Preferably, the silica with a particle size not greater than 200 mesh accounts for 80-90% by weight.

In the present invention, the fuel may be selected from various fuels commonly used in the sintering process, such as coke powder and/or coal powder. From the perspective of further improving the quality of the basic vanadium-titanium sinter, it is preferable that the fuel is coke powder.

The preparation method of basic vanadium-titanium sintered ore provided by the invention comprises the following steps:

(1) Mixing the above-mentioned sintering raw material composition, returning ore and water to obtain a mixture;

(2) Distributing and sintering the mixture described in step (1) sequentially.

In the present invention, there is no special limitation on the process of mixing materials in step (1). Preferably, the process of mixing materials may include: primary mixing and mixing and secondary mixing and granulation. The method of mixing and mixing may include mixing the sintered raw material composition, returning ore and water for 4-5 minutes, wherein the amount of water makes the water content of the mixture obtained in the mixing and mixing process 7-7.5% by weight %, the amount of the returned ore is 20-30 parts by weight; the method of the second mixing granulation can include mixing the mixture obtained by the first mixing with water for 3-4min, wherein the amount of the water makes the second mixing The moisture content of the mixture obtained from the granulation process is 7.5-8% by weight.

The inventors of the present invention have found that by reasonably controlling the conditions of the mixed material, such as controlling the conditions of the first mixing and the second mixing granulation, the moisture content of the mixture is controlled within the above range, and the mixing can be more advantageously controlled. The mixture with a particle size of not less than 3mm in the material accounts for more than 80% by weight. In this way, the particle size composition of the mixture can be effectively improved, and the air permeability of the sintered mixture can be significantly improved, thereby effectively improving the quality of the sintered ore and further ensuring the production of various properties. The index can meet the furnace performance requirements of blast furnace smelting with basic vanadium-titanium furnace protection sinter. In addition, controlling the amount of returned ore in the above range during the process of mixing materials can further improve the quality of sintered ore. The returned ore is the basic vanadium-titanium sintered ore with a particle size not greater than 5mm obtained after screening the finished basic vanadium-titanium sintered ore.

According to the present invention, there is no special limitation on the process of fabric distributing in step (2), and the conventional fabric fabric process in this field can be used for implementation. Preferably, the fabric is such that the height of the material layer is 550-650mm. Controlling the height of the material layer within the above range can effectively control the sintering speed, and the automatic heat storage effect of the material layer can be used to reduce the amount of carbon allocated.

Preferably, the preparation method of the basic vanadium-titanium sintered ore of the present invention further includes arranging a primer at the bottom of the mixture during the distributing process. In the present invention, the primer can be the commonly used primer in the field for preparing sintered ore. Preferably, the primer is the finished basic vanadium-titanium sintered ore with a particle size of 10-16mm after screening. Alkaline vanadium-titanium sinter. In addition, the present invention does not specifically limit the height of the primer. Preferably, the height of the primer is 20-30 mm.

Preferably, the preparation method of the basic vanadium-titanium sintered ore of the present invention also includes pressing the material layer during the distributing process, so that the bulk density of the sintered raw materials is increased, and the sintered raw materials are in close contact, which can effectively reduce the sintering process. speed, prolong the high temperature holding time, make the mineral crystallization more fully, improve the mineral composition and structure of the sintered ore, and further improve the quality of the sintered ore. Preferably, the pressing material makes the material layer pressed down by 20-40mm.

In the present invention, the sintering conditions in step (2) are not particularly limited, and can be implemented according to conventional sintering conditions. Preferably, the sintering ignition temperature is 1000-1150°C, the sintering negative pressure is 14-16kPa, and the sintering machine speed is 2-2.2m/min.

The present invention also provides the basic vanadium-titanium sintered ore prepared by the above method.

The drum strength of the basic vanadium-titanium sintered ore prepared by the method of the present invention is 72-74%, the binary basicity is 2-3, and the content of TFe in the basic vanadium-titanium sintered ore is 52-53% by weight , the content of SiO ₂ is 2-4% by weight and the content of TiO ₂ is 11-11.5% by weight.

In addition, the present invention also provides the application of the above-mentioned basic vanadium-titanium sinter as furnace-protecting sinter in blast furnace smelting.

The present invention will be further described below in conjunction with the examples, but the present invention is not limited to the following examples.

In the following examples and comparative examples:

Sea sand vanadium titanium magnetite concentrate powder comes from Indonesia and its surrounding areas, the main chemical composition is: the content of TFe is 58.22% by weight, the content of FeO is 30.07% by weight, the content of _TiO2 is 12.64% by weight and the content of _SiO2 is 0.73 weight%;

The content of _SiO2 in silica accounts for 90% by weight;

The content of CaO in the active lime is 86.41% by weight, and the activity degree is 300mL;

The carbon content of the coke powder is 83.75% by weight, the volatile content is 1.14% by weight, and the ash content is 12.4% by weight;

The method for measuring the strength of sinter is: According to the ISO drum strength defined in GB13242, it means that after taking 7.5 kg of 10-40mm sinter and rotating it in the ISO drum machine for 200 revolutions, the sinter with a particle size of >6.3mm accounts for the entire sinter The percentage of weight, while the drum strength is an important indicator to measure the strength of sintered ore, the higher the strength of sintered ore, the better. Adopt SQZG-4 type ISO rotary drum machine (Hebi City Metallurgical Machinery Equipment Co., Ltd.) to measure in the present invention;

The calculation method of the yield of sintered ore is: after the sintered ore is burnt, it is poured out, cooled naturally, dropped twice from a height of 2m, sieved, and the yield is calculated as the percentage of the particle size > 6.3mm;

The calculation method of the binary alkalinity of sintered ore is as follows: 3-4 test samples are randomly selected from the finished sintered ore, and then the test samples are mixed to test the contents of CaO and SiO ₂ in the mixed test samples, and the obtained CaO and SiO ₂ The ratio of content is the binary alkalinity of sintered ore.

Example 1

This example is used to illustrate the basic vanadium-titanium sintered ore of the present invention and its preparation method.

Sea sand vanadium-titanium magnetite concentrate powder, active lime, silica and coke powder are proportioned according to the proportions in Table 1, and then mixed with returning ore and water (including first mixing and second mixing granulation), wherein , the silica in which the particle size is not greater than 200 mesh accounts for 80% by weight, and the amount of returned ore is as shown in Table 1 to obtain a mixture. The water content of the mixture is 7.5% by weight, and the particle size in the mixture is not less than 3mm. Accounting for more than 85% by weight.

First arrange the bottom layer with a height of 20mm, then use the magnetic roller distributor to distribute the above-mentioned mixture, and press the material (control the material layer to press down 30mm), so that the height of the material layer is 600mm, and then add the mixture to the chain Sintering is carried out on a trolley with a grate length of 80m (the area of the sintering machine is 360m ² ), the ignition temperature of the sintering is set at 1050°C, the negative pressure of the sintering is 17kPa, and the sintering machine speed is 1.9m/min.

The basic vanadium-titanium sinter X1 was obtained, and the test results of its binary basicity, drum strength, yield, sintering machine utilization factor and the content of TFe, SiO ₂ , FeO, and TiO ₂ in the basic vanadium-titanium sinter X1 are shown in the table 1.

Example 2

This example is used to illustrate the basic vanadium-titanium sintered ore of the present invention and its preparation method.

Sea sand vanadium-titanium magnetite concentrate powder, active lime, silica and coke powder are proportioned according to the proportions in Table 1, and then mixed with returning ore and water (including first mixing and second mixing granulation), wherein , the silica in which the particle size is not greater than 200 mesh accounts for 88% by weight, and the amount of returned ore is as shown in Table 1 to obtain a mixture. The water content of the mixture is 8% by weight, and the particle size in the mixture is not less than 3mm. Accounting for more than 90% by weight.

First arrange the bottom layer with a height of 25mm, then use the magnetic roller distributor to distribute the above-mentioned mixture, and press the material (control the material layer to press down 40mm), so that the height of the material layer is 650mm, and then add the mixture to the chain The sintering is carried out on a trolley with a grate length of 80m (the area of the sintering machine is 360m ² ), the ignition temperature of the sintering is set at 1050°C, the negative pressure of the sintering is 16kPa, and the sintering machine speed is 2.0m/min.

The basic vanadium-titanium sinter X2 is obtained, and the test results of its binary basicity, drum strength, yield, sintering machine utilization factor and the content of TFe, SiO ₂ , FeO, TiO ₂ in the basic vanadium-titanium sinter X2 are shown in the table 1.

Example 3

This example is used to illustrate the basic vanadium-titanium sintered ore of the present invention and its preparation method.

Sea sand vanadium-titanium magnetite concentrate powder, active lime, silica and coke powder are proportioned according to the proportions in Table 1, and then mixed with returning ore and water (including first mixing and second mixing granulation), wherein , the silica in which the particle size is not greater than 200 mesh accounts for 85% by weight, and the amount of returned ore is as shown in Table 1 to obtain a mixture. The water content of the mixture is 7.8% by weight, and the particle size in the mixture is not less than 3mm. Accounting for more than 88% by weight.

First arrange the base material with a height of 27mm, then use the magnetic roller distributor to distribute the above-mentioned mixture, and press the material (control the material layer to press down 20mm), so that the height of the material layer is 550mm, and then add the mixture to the chain Sintering is carried out on a trolley with a grate length of 80m (the area of the sintering machine is 360m ² ), the ignition temperature of the sintering is set at 1150°C, the negative pressure of the sintering is 14kPa, and the sintering machine speed is 2.2m/min.

The basic vanadium-titanium sinter X3 was obtained, and the test results of its binary basicity, drum strength, yield, sintering machine utilization factor and the content of TFe, SiO ₂ , FeO, and TiO ₂ in the basic vanadium-titanium sinter X3 are shown in the table 1.

Example 4

This example is used to illustrate the basic vanadium-titanium sintered ore of the present invention and its preparation method.

Prepare basic vanadium-titanium sintered ore according to the method in Example 1, the difference is that the amount of water used is such that the water content of the mixture is 9% by weight, and basic vanadium-titanium sintered ore X4 is obtained, and its binary alkalinity , drum strength, yield, sintering machine utilization factor and the test results of TFe, SiO ₂ , FeO, TiO ₂ content in basic vanadium-titanium sinter X4 are shown in Table 1.

Example 5

This example is used to illustrate the basic vanadium-titanium sintered ore of the present invention and its preparation method.

Prepare basic vanadium-titanium sintered ore according to the method in Example 1, the difference is that relative to 100 parts by weight of the sintering raw material composition, the amount of the returned ore is 10 parts by weight, and the basic vanadium-titanium sintered ore X5 is obtained , the test results of binary basicity, drum strength, yield, sintering machine utilization factor and TFe, SiO ₂ , FeO, TiO ₂ content in basic vanadium-titanium sinter X5 are shown in Table 1.

Example 6

This comparative example is used to illustrate the reference basic vanadium-titanium sinter and its preparation method.

Prepare basic vanadium-titanium sintered ore according to the method in Example 1, the difference is that when the sintering raw material composition of the present invention is used for sintering on a sintering machine, the sintering negative pressure is controlled to 10kPa, and basic vanadium-titanium sintered ore X6 is obtained, Table 1 shows the test results of its binary basicity, drum strength, yield, sintering machine utilization factor, and TFe, SiO ₂ , FeO, and TiO ₂ contents in basic vanadium-titanium sinter X6.

Example 7

This comparative example is used to illustrate the reference basic vanadium-titanium sinter and its preparation method.

Prepare basic vanadium-titanium sintered ore according to the method of Example 1, the difference is that when using the sintering raw material composition of the present invention to sinter on a sintering machine, the speed of the sintering machine is controlled to be 2.5m/min to obtain basic vanadium-titanium Table 1 shows the test results of sinter X7, its binary basicity, drum strength, yield, sintering machine utilization factor, and the content of TFe, SiO ₂ , FeO, and TiO ₂ in basic vanadium-titanium sinter X7.

Table 1

As can be seen from the data results in Table 1, the various performance indicators of the basic vanadium-titanium sinter provided by the present invention are better, and can meet the furnace performance requirements of the furnace-protected sinter for blast furnace smelting, and can replace the protection furnace for blast furnace smelting Titanium-containing pellets, titanium-containing lump ore, and titanium-containing slag are of great significance to the longevity of blast furnaces.

The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solutions of the present invention. These simple modifications All belong to the protection scope of the present invention.

Claims (10)

1. a kind of raw materials for sintering composition, it is characterised in that the raw materials for sintering composition is by sea sand v-ti magnetite concentrate powder, activity Lime, silica and fuel composition, on the basis of the gross weight of the raw materials for sintering composition, the sea sand v-ti magnetite concentrate powder Content be 86-89 weight %, the content of the active lime is 5-7 weight %, and the content of the silica is 1-2 weight %, The content of the fuel is 4.5-5 weight %；

TFe content is that 57.5-58.5 weight %, FeO content are 29-31 weights in the sea sand v-ti magnetite concentrate powder Measure %, TiO₂Content be 12-13 weight % and SiO₂Content be 0.5-1 weight %；SiO in the silica₂Content account for 90-95 weight %, granularity accounts for 80-90 weight % no more than the silica of 200 mesh in the silica.

2. a kind of preparation method of alkaline vanadium-titanium magnitite sinter, this method include：

(1) by the raw materials for sintering composition described in claim 1, return mine with water carry out mixing system material, obtain compound；

(2) step (1) described compound is subjected to cloth and sintering successively.

3. according to the method for claim 2, wherein, in step (1), the dosage of the water causes containing for the compound Water is 7.5-8 weight %.

4. the method according to claim 11, wherein, in step (1), relative to the raw materials for sintering of 100 parts by weight Composition, the dosage returned mine are 20-30 parts by weight.

5. according to the method described in any one in claim 2-4, wherein, the mixing system material make it that granularity is not in compound Compound less than 3mm accounts for more than 80 weight %.

6. according to the method for claim 2, wherein, in step (2), the cloth make it that bed depth is 550- 650mm。

7. according to the method for claim 2, wherein, in step (2), the firing temperature of the sintering is 1000-1150 DEG C, the negative pressure of sintering is 14-16kPa, sintering machine speed 2-2.2m/min.

8. the alkaline vanadium-titanium magnitite sinter being prepared as the method described in profit requires any one in 2-7.

9. alkaline vanadium-titanium magnitite sinter according to claim 8, wherein, the drum strength of the alkaline vanadium-titanium magnitite sinter is 72-74%, dual alkalinity 2-3, TFe content is 52-53 weight %, TiO in the alkaline vanadium-titanium magnitite sinter₂Content be 11-11.5 weight % and SiO₂Content be 2-4 weight %.

10. application of the alkaline vanadium-titanium magnitite sinter as furnace retaining sintering deposit in blast furnace process described in claim 8 or 9.