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Method for modifying semisteel converter steelmaking final slag

A converter steelmaking and upgrading technology, applied in the field of metallurgy, can solve the problems of high, fluctuating between 19-21wt%, large iron loss, etc., and achieves the effects of low cost, reduced iron loss and simple operation

Active Publication Date: 2014-04-23
PANGANG GROUP RESEARCH INSTITUTE CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the end point of the converter in semi-steel smelting also uses carbonaceous modifiers for slag modification and achieves the purpose of controlling slag and slag splashing to protect the furnace, but the total iron content of the final slag is still high, fluctuating between 19-21wt%. During the period, the iron loss is relatively large after slag dumping; at the same time, with the continuous decline in the profits of steel products, cost reduction has become the focus of attention of major steel companies

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A factory uses semi-steel after vanadium extraction as raw material for steelmaking, and the nominal capacity of the converter is 200t. The bottom blowing gas supply strength used in the early stage of smelting is 0.03m 3 / (min t 钢 ), increase the air supply intensity to 0.07m immediately after the supplementary blowing 3 / (min t 钢 ), and use the sub-lance to measure the oxygen activity of the end point molten steel to be 200ppm. At this time, add anthracite 1.5Kg / t into the converter according to the end point oxygen activity of the molten steel 渣 , add high magnesium lime 2Kg / t after 30 seconds 渣 , and make molten steel at 0.07m 3 / (min t 钢 ) under the condition of air supply strength, let it stand for 1min and then tap the steel. The amount of slag when tapping is 2Kg / t 钢 , The total iron content in the slag was 18.2% by sampling.

Embodiment 2

[0031] A factory uses semi-steel after vanadium extraction as raw material for steelmaking, and the nominal capacity of the converter is 200t. The bottom blowing gas supply intensity used in the early stage of smelting is 0.05m 3 / (min t 钢 ), increase the air supply intensity to 0.08m immediately after the supplementary blowing 3 / (min t 钢 ), and use the sub-lance to measure the oxygen activity of the end point molten steel to be 400ppm. At this time, add anthracite 3Kg / t into the converter according to the end point oxygen activity of the molten steel 渣 , add high magnesium lime 3Kg / t after 30 seconds 渣 , and make molten steel at 0.08m 3 / (min t 钢 ) under the condition of air supply intensity, the steel was tapped after standing for 1.5min. The amount of slag when tapping is 3Kg / t 钢 , The total iron content in the slag was 17.9% by sampling.

Embodiment 3

[0035] A factory uses vanadium-extracted semi-steel as raw material for steelmaking, and the nominal capacity of the converter is 120t. The bottom blowing gas supply strength used in the early stage of smelting is 0.04m 3 / (min t 钢 ), increase the air supply intensity to 0.075m immediately after the supplementary blowing 3 / (min t 钢 ), and use the sub-lance to measure the oxygen activity of the end-point molten steel to be 700ppm. At this time, add anthracite 4Kg / t into the converter according to the oxygen activity of the end-point molten steel 渣 , add high magnesium lime 4.5Kg / t after 30 seconds 渣 , and make molten steel at 0.075m 3 / (min t 钢 ) under the condition of air supply strength, tap steel after standing for 2 minutes. The amount of slag when tapping is 3Kg / t 钢 , The total iron content in the slag was 17.3% by sampling.

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Abstract

The invention discloses a method for modifying semisteel converter steelmaking final slag. The method comprises the following steps of: adding preset quantity of first modified substance and second modified substance sequentially in the integral process of converter steelmaking in a bottom blowing gas supply mode according to the oxygen activity of end-point molten steel before tapping of the molten steel, standing and tapping, wherein the first modified substance is a carbon reduction material, and the second modified substance is a magnesium material. By the method, the defects of high cost and an unobvious effect of a modifier for modifying the final slag are overcome; and a regulator or the modifier for the converter final slag is replaced by using a low-cost steelmaking auxiliary material, and the double aims of end-point slag regulation and the reduction of the all-iron content of the slag are fulfilled by adjusting the strength of the bottom blowing gas supply. The method is easy to operate and low in cost, and is practical and feasible in a process and a technology, so that the all-iron content of the slag is reduced effectively, and iron loss is reduced; and the method can be applied to the production of other domestic iron and steel enterprises and has a good popularization and application prospect.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and more specifically relates to a method for modifying the final slag of semi-steel converter steelmaking. Background technique [0002] With the continuous improvement of steelmaking technology, the technology of upgrading the slag at the end of converter steelmaking (ie final slag) has been applied in major iron and steel enterprises. In the existing final slag upgrading technology, the upgrading of slag is mainly achieved by adding a modifier. There are two ways to add the modifier: after blowing, before tapping the steel, and after tapping the converter. The modified final slag has an increased viscosity and poor fluidity, which can effectively prevent the converter from The slag enters the ladle and pollutes the molten steel; the slag with high viscosity and high MgO content can effectively adhere to the furnace lining to protect the converter lining through slag splashing to protect th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/36
Inventor 陈均曾建华陈永梁新腾李青春翁建军喻林何为谢明科
Owner PANGANG GROUP RESEARCH INSTITUTE CO LTD