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Blast furnace ironmaking technology adopting high pellet ore proportion

A technology of blast furnace ironmaking and pelletizing, which is applied in the field of metallurgical coking, can solve the problems of unsatisfactory technical and economic indicators, difficulty in stable operation of ironmaking blast furnaces, etc., and achieve the effects of stable S content, improved pig iron quality, and improved forward flow

Inactive Publication Date: 2015-02-25
ANYANG IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the blast furnace ironmaking process in the domestic prior art has long been troubled by the vicious circle of sintering tension→increasing the pellet ratio→abnormal furnace conditions→decreasing the pellet ratio→sintering and tense vicious circle. It is difficult to maintain the ironmaking blast furnace for a long time Stable operation, but unsatisfactory technical and economic indicators

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A blast furnace ironmaking process using a high pellet ratio, the steps are as follows:

[0032] The first step is to prepare pellets:

[0033] Mix iron concentrate, bentonite, and MgO-containing materials according to the ratio in the prior art, and add one or more of high-magnesium powder, high-magnesium ore or steelmaking sludge to control the MgO content of the mixed raw materials, Make its MgO content greater than 2.5%, SiO 2 Content less than 5.5%, Na 2 O and K 2 The total content of O is less than 0.1%, and ZnO<0.05%. The prepared raw materials are made into green pellets with a particle size of Φ8mm, and roasted at a temperature not lower than 1150°C. The obtained pellets have a strength of more than 2200N, and the strength is low. The mass content of pellets at 1000N is less than 10%.

[0034] The second step, 400m 3 Level blast furnace smelting:

[0035] Put the ore with a mass content of 45% of the pellets obtained in the first step into the blast furna...

Embodiment 2

[0041] A blast furnace ironmaking process using a high pellet ratio, the steps are as follows:

[0042] The first step is to prepare pellets:

[0043] Mix iron concentrate, bentonite, and MgO-containing materials according to the ratio in the prior art, and add one or more of high-magnesium powder, high-magnesium ore or steelmaking sludge to control the MgO content of the mixed raw materials, Make its MgO content greater than 2.5%, SiO 2 Content less than 5.5%, Na 2 O and K 2 The total content of O is less than 0.1%, and ZnO<0.05%. The prepared raw materials are made into green pellets with a particle size of Φ14mm, and roasted at a temperature not lower than 1150°C. The obtained pellets have a strength of more than 2200N, and the strength is low. The mass content of pellets at 1000N is less than 10%.

[0044] The second step, 600m 3 Level blast furnace smelting:

[0045] Put the ore with a mass content of 55% of the pellets obtained in the first step into the blast...

Embodiment 3

[0051] A blast furnace ironmaking process using a high pellet ratio, the steps are as follows:

[0052] The first step is to prepare pellets:

[0053] Mix iron concentrate, bentonite, and MgO-containing materials according to the ratio in the prior art, and add one or more of high-magnesium powder, high-magnesium ore or steelmaking sludge to control the MgO content of the mixed raw materials, Make its MgO content greater than 2.5%, SiO 2 Content less than 5.5%, Na 2 O and K 2 The total content of O is less than 0.1%, and ZnO<0.05%. The prepared raw materials are made into green pellets with a particle size of Φ11mm, and roasted at a temperature not lower than 1150°C. The obtained pellets have a strength of more than 2200N, and the strength is low. The mass content of pellets at 1000N is less than 10%.

[0054] The second step, 400m 3 Level blast furnace smelting:

[0055] Put the ore with a mass content of 50% of the pellets obtained in the first step into the blast ...

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Abstract

The invention relates to the technical field of metallurgy and coking, in particular to a method for operating a blast furnace using high-proportion pellets. The process, the steps are as follows: prepare the pellets and make the MgO content greater than 2.5%, the SiO2 content is less than 5.5%, the total content of Na2O and K2O is less than 0.1%, ZnO<0.05%, and then roasted; the obtained pellets The ore with a mass content of 45% to 55% is put into a blast furnace for cloth and low-silicon smelting to obtain pig iron. The process of the invention is simple, and by improving the component content and organizational structure of the pellets and adjusting some technical parameters during blast furnace smelting, the blast furnace can run stably when smelting ores with a mass content of more than 45% of the pellets, which improves the efficiency of the enterprise. benefit.

Description

technical field [0001] The invention relates to the technical field of metallurgy and coking, in particular to a blast furnace ironmaking process using a high proportion of pellets. Background technique [0002] At present, during domestic blast furnace ironmaking, the proportion of pellets into the furnace is generally less than 15%, and the proportion of pellets into the furnace for ironmaking by individual iron and steel enterprises reaches 30%, but the blast furnace ironmaking with a high pellet proportion of more than 45% has been maintained for a long time Technology, not yet. In foreign ironmaking technology, the proportion of pellets into the furnace reaches 100%, but the pellets are flux pellets, non-acidic oxidized pellets, and their SiO 2 The content is below 3.0%, and it belongs to two different types of pellets from domestic pellets. [0003] In the blast furnace ironmaking in the prior art, due to insufficient sinter raw materials, the proportion of pellets ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21B5/00C22B1/24
Inventor 叶斌孙涛李德友闫东然徐杨斌王维张付昌周志雄庞秋林徐德强柴强王海玲付林林
Owner ANYANG IRON & STEEL