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Blast furnace ironmaking method using fully acid pellets as raw material

A blast furnace ironmaking and acidic technology, applied in blast furnaces, blast furnace details, furnaces, etc., can solve problems such as poor air permeability of blast furnace charge, blast furnace suspended material, collapsed material, and abnormal furnace conditions such as wind stop, so as to achieve good air permeability and avoid The effect of suspending materials and improving air permeability

Active Publication Date: 2021-08-17
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention provides an ironmaking method using full-acid pellets as raw material to solve the problem of poor air permeability of blast furnace charge caused by using full-acid pellets as raw material. As a result, technical problems such as blast furnace material suspension, material collapse, and wind stop have occurred in abnormal furnace conditions.

Method used

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  • Blast furnace ironmaking method using fully acid pellets as raw material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] Taking a 400 vertical blast furnace as an example, the blast furnace hourly material batch is 7 batches, the batch iron amount is 7.32t / p, the batch weight of acid pellets is 12t, the batch weight of coke is 3t, the acid pellets contain 61% iron, slag iron The ratio is 0.32t / tFe, the hourly coal injection rate is 6.5t, the preset value of final slag MgO content is 6%, and the preset value of final slag binary alkalinity is 1.2. Among them, the mass fractions of CaO, SiO2 and MgO in the alkaline solvent, acid pellets, coke and coal powder used are shown in Table 1.

[0059] Table 1

[0060] name limestone powder Dolomite powder acid pellets Coke pulverized coal CaO / % 53.78 34.48 5.7 0.38 2.1 SiO2 / % 0.89 0.84 6.5 6 7.4 MgO / % 0.61 19 0.97 0.1 0.3

[0061] Calculate the injection volume of dolomite powder and limestone powder:

[0062] Hourly injection volume calculation of dolomite powder:

[0063] Hourly dolomite po...

Embodiment 2

[0081] Taking a 400 vertical blast furnace as an example, the batch of blast furnace materials per hour is 7.2 batches, the amount of batch iron is 7.44t / p, the batch weight of acid pellets is 12.2t, the batch weight of coke is 3.6t, and the acid pellets contain 61% iron. The slag-iron ratio is 0.32t / tFe, the hourly coal injection rate is 7t, the preset value of final slag MgO content is 6.5%, and the preset value of final slag binary alkalinity is 1.19. Among them, the mass fractions of CaO, SiO2 and MgO in the alkaline solvent, acid pellets, coke and coal powder used are shown in Table 2.

[0082] Table 2

[0083] name limestone powder Dolomite powder acid pellets Coke pulverized coal CaO / % 53.78 36 4.2 0.38 2.1 SiO2 / % 0.89 0.73 5.1 6 7.4 MgO / % 0.61 20.4 1.1 0.1 0.3

[0084] Calculate the injection volume of dolomite powder and limestone powder:

[0085] Hourly injection volume calculation of dolomite powder:

[0086] ...

Embodiment 3

[0104] Taking a 2500 vertical blast furnace as an example, the blast furnace hourly material batch is 6.5 batches, the batch iron amount is 40.3t / p, the batch weight of acid pellets is 62t, the batch weight of coke is 12.6t, the acid pellets contain 65% iron, and the slag The iron ratio is 0.27t / tFe, the hourly coal injection rate is 38t, the preset value of the MgO content of the final slag is 6.5%, and the preset value of the binary alkalinity of the final slag is 1.22. Among them, the mass fractions of CaO, SiO2 and MgO in the alkaline solvent, acid pellets, coke and coal powder used are shown in Table 3.

[0105] table 3

[0106] name limestone powder Dolomite powder acid pellets Coke pulverized coal CaO / % 53.78 34.48 2.6 0.38 2.1 SiO2 / % 0.89 0.83 3.15 4 6.4 MgO / % 0.61 18 0.97 0.1 0.3

[0107] Calculate the injection volume of dolomite powder and limestone powder:

[0108] Hourly injection volume calculation of dolomi...

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Abstract

The invention belongs to the technical field of blast furnace ironmaking, and relates to an ironmaking method using fully acid pellets as a raw material. The method comprises the steps that the acid pellets and coke are subjected to blast furnace burden distribution to form a furnace burden structure in which acid pellet layers and coke layers are alternately arranged up and down, wherein the weight ratio of each acid pellet layer to the adjacent coke layer is 3.0-9.0; and after burden distribution, the acid pellets and the coke in a blast furnace are subjected to a reduction reaction, meanwhile, an alkaline solvent is blown to a blast furnace tuyere to control the mass fraction of MgO in blast furnace final slag to be 6-10%, and molten iron and the blast furnace final slag are obtained. By adopting the method, the S content of the molten iron can be 0.035-0.047%, the temperature of the molten iron is 1486-1501 DEG C, the pressure difference is 165-167 KPa, and the air permeability is good.

Description

technical field [0001] The invention belongs to the technical field of blast furnace ironmaking, and in particular relates to an ironmaking method using fully acidic pellets as raw materials. Background technique [0002] Pellet is a kind of bulk raw material made of fine-grained raw materials. During the process of making pellets, fine-grained materials roll into balls, and physical properties, such as density, porosity, shape, size and mechanical strength, will change. Changes in chemical and physical chemical properties, such as chemical composition, reduction, expansion, high temperature reduction softening, low temperature reduction softening and melting, improve the metallurgical properties of the material. [0003] Pellets can be divided into acid pellets, basic pellets and flux pellets. Acid pellets generally refer to pellets with a basicity of less than 0.9, flux pellets generally have a basicity of 0.9-1.0, and basic pellets The alkalinity is greater than 1.0. At...

Claims

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Application Information

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IPC IPC(8): C21B5/00
CPCC21B5/008C21B5/007
Inventor 张思斌张勇张福明马金芳赵满祥任建军李晓强许佳马怀营
Owner SHOUGANG CORPORATION
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