Converter manganese ore direct alloying steelmaking method

An alloying steelmaking and alloying technology, applied in the manufacture of converters, etc., can solve the problems of poor dephosphorization effect and difficulty in semi-steel, and achieve the effects of increasing manganese content, high yield, and reducing converter smelting costs

Active Publication Date: 2019-12-03
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A domestic iron and steel enterprise adopts semi-steel smelting. The content of silicon, manganese and other heat-generating slag-forming elements in the semi-steel obtained after the vanadium-containing molten iron is extracted from vanadium is traces, and the carbon and temperature of the semi-steel are relatively low. The dephosphorization effect is poor, so the semi-steel is used The direct alloying process of semi-steel smelting converter manganese ore is more difficult

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The phosphorus content of molten iron in a 120t converter in a factory is 0.080%.

[0033] Using the present invention for smelting, adding the first batch of slag-making materials to control the basicity of the slag to 1.2 after adding iron to the converter, blowing with the lower lance, and the oxygen supply intensity of the top-blown oxygen lance is 3m 3 / t min, the bottom blowing gas supply intensity is 0.1m 3 / t min, add the second batch of slagging materials to control the slag alkalinity to 2.5 when blowing reaches 3 minutes, and reduce the gas supply intensity of bottom blowing to 0.05-0.1m 3 / t min, when the carbon content of the molten iron in the furnace is 1.0%, the furnace is poured and the slag is discharged, and the bottom blowing gas supply intensity is reduced to 0.03m when the slag is discharged 3 / t min;

[0034] Secondary slagging is carried out after slagging, and high-magnesium lime 5kg / t steel and active lime 9kg / t steel are added when the second...

Embodiment 2

[0037] The phosphorus content of molten iron in a 120t converter in a factory is 0.095%.

[0038] Adopt the present invention to carry out smelting, add the first batch of slagging materials to control the basicity of the slag to 1.5 after converting the iron into the converter, lower the lance for blowing, and the oxygen supply intensity of the top-blown oxygen lance is 4m 3 / t min, the bottom blowing gas supply intensity is 0.2m 3 / t min, when blowing reaches 3 minutes; add the second batch of slagging materials to control the slag alkalinity to 3.0, and reduce the bottom blowing gas supply intensity to 0.1m 3 / t·min. When the carbon content of the molten iron in the furnace is 1.5%, the furnace is poured and the slag is discharged, and the bottom blowing gas supply intensity is reduced to 0.05m when the slag is discharged 3 / t min;

[0039] Secondary slagging is carried out after slagging, and high magnesium lime 8kg / t steel and active lime 7kg / t steel are added when the...

Embodiment 3

[0042] The phosphorus content of molten iron in a 120t converter in a factory is 0.090%.

[0043] Using the present invention for smelting, add the first batch of slagging materials to control the basicity of the slag to 1.4 after adding iron to the converter. 3 / t min, the bottom blowing gas supply intensity is 0.15m 3 / t min, blowing to 3min; add the second batch of slagging materials to control the slag alkalinity to 2.8, and the bottom blowing gas supply intensity is reduced to 0.08m 3 / t·min. When the carbon content of the molten iron in the furnace is 1.3%, the furnace is poured and the slag is discharged, and the bottom blowing gas supply intensity is reduced to 0.04m when the slag is discharged 3 / t min;

[0044] Secondary slagging is carried out after slagging, and high magnesium lime 6kg / t steel and active lime 8kg / t steel are added when the secondary slagging starts blowing, and the gas supply intensity of bottom blowing is 0.15m 3 / t min, after blowing for 1.5m...

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PUM

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Abstract

The invention relates to a converter manganese ore direct alloying steelmaking method, and belongs to the technical field of steelmaking. According to the method, a converter double-slag smelting method is adopted, a slagging material is added for primary slagging blowing, carbon drawing and deslagging are conducted after early dephosphorization, then secondary slagging blowing is conducted, the slagging material, a temperature raising agent and manganese ore are added in the secondary slagging blowing process for alloying, blowing is conducted till the final molten steel temperature is 1640-1670 DEG C, and tapping is conducted. According to the method, the dephosphorization effect of the converter is guaranteed, meanwhile, the manganese content of the end point molten steel is increased,and the manganese yield is high.

Description

technical field [0001] The invention belongs to the technical field of steelmaking, and in particular relates to a method for direct alloying of converter manganese ore for steelmaking. Background technique [0002] In steelmaking production, manganese is an essential alloying element, which plays an important role in improving the quality and performance of steel. At present, most iron and steel enterprises carry out manganese alloying operation on molten steel by adding manganese ferroalloy during tapping process or refining. The manufacturing process of manganese-based alloys mainly uses manganese-rich ore, and it is a process of high energy consumption and high pollution. Not only the manufacturing cost is high, but also the environmental pollution is great. Therefore, the price of manganese alloys is often higher, and the cost of manganese alloying in steelmaking is higher. Direct alloying of manganese ore refers to the direct use of manganese alloy element oxides (ma...

Claims

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Application Information

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IPC IPC(8): C21C7/00C21C7/064C21C5/35C21C5/36
CPCC21C5/35C21C5/36C21C7/0006C21C7/0025C21C7/064
Inventor 陈均梁新腾杨晓东杨森祥赵志强
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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