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Method for gasifying, dephosphorizing and steel-making in converter steel slag furnace

A converter steel slag and slag technology, applied in the field of metallurgy, can solve the problems of large loss of steel materials and insufficient heat source, etc.

Inactive Publication Date: 2018-11-06
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

The traditional "slag-retaining" operation can alleviate the problem of slow slag formation, but the problem of insufficient heat source is still difficult to solve. After adopting the slag-retaining operation, the average TFe content of the final slag caused by deep blowing of the converter is also above 20%, and the slag dumping makes the steel material big loss

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A 200t converter in a factory uses semi-steel steelmaking. When the first furnace is smelted and blown, 15kg / t of active lime, 15kg of high-magnesium lime and acidic compound slagging agent are added to the furnace to control the slag alkalinity at the end point. Oxygen intensity is 3.0m 3 / t·min, until the end of blowing, add the first anthracite 0.5kg / t steel into the furnace before tapping, splash slag after tapping, and blow nitrogen into the furnace from the top blowing oxygen lance during slag splashing, the gas supply intensity is 2m 3 / t min, nitrogen blowing at the bottom, the gas supply intensity is 0.15m 3 / t·min, the position of the oxygen lance is 0.5m. Add 0.5kg / t of second anthracite coal into the furnace before blowing nitrogen with oxygen lance for slag splashing, and the slag splashing time is 2min.

[0032] The second furnace is smelted according to the method of the first furnace, and the slag-making material is halved on the basis of the first fu...

Embodiment 2

[0037] A 200t converter in a factory uses semi-steel steelmaking. When the first furnace is smelted and blown, 20kg / t of active lime, 10kg of high magnesium lime and acidic compound slagging agent are added to the furnace to control the basicity of the slag at the end point. Oxygen intensity is 3.5m 3 / t·min, until the end of blowing, add the first anthracite 1kg / t steel into the furnace before tapping, splash slag after tapping, and blow nitrogen into the furnace from the top blowing oxygen lance during slag splashing, the gas supply intensity is 3m 3 / t min, nitrogen blowing at the bottom, the gas supply intensity is 0.05m 3 / t·min, the position of the oxygen lance is 1.0m. Add 1.5kg / t of second anthracite coal into the furnace before blowing nitrogen with the slag-splashing oxygen lance, and the slag-splashing time is controlled at 4 minutes.

[0038] The second furnace is smelted according to the method of the first furnace, and the slag-making material is halved on the b...

Embodiment 3

[0043] A 200t converter in a factory uses semi-steel steelmaking. When the first furnace is smelted and blown, 18kg / t of active lime, 12kg of high-magnesium lime and acidic compound slagging agent are added to the furnace to control the terminal slag alkalinity to 3.5. Oxygen intensity is 3.2m 3 Between / t·min until the end of blowing, add the first anthracite 0.8kg / t steel into the furnace before tapping, splash slag after tapping, blow nitrogen into the furnace from the top blowing oxygen lance during slag splashing, and supply gas Strength is 2.5m 3 / t min, nitrogen blowing at the bottom, the gas supply intensity is 0.1m 3 / t·min, the position of the oxygen lance is 0.6m. Add the second anthracite 1kg / t steel into the furnace before blowing nitrogen with the slag-splashing oxygen lance, and the slag-splashing time is controlled at 3 minutes.

[0044] The second furnace is smelted according to the method of the first furnace, and the slag-making material is halved on the ...

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PUM

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Abstract

The invention relates to a method for gasifying, dephosphorizing and steel-making in a converter steel slag furnace, and belongs to the technical field of metallurgy. The method comprises the following steps of: first furnace smelting: blowing gas, adding a slag-making material into a first furnace while starting to blow, controlling alkalinity of end-point slag until blowing is ended, adding first anthracite before tapping, splashing slag after tapping, gasifying, dephosphorizing and keeping all steel slag; second furnace smelting: reducing dosage of the slag-making material by one half, keeping one half of the slag after tapping, splashing the slag, and keeping the residual steel slag; and the rest of the steps which are the same with the first furnace smelting step; the third to the tenth furnace smelting: reducing 20-30wt% of the dosage of the slag-making material on the basis of the first furnace, keeping one half of the slag after tapping, and splashing the slag; and the rest ofthe steps which are the same with the first furnace smelting step. The method is simple, can reduce content of phosphor in steel slag, increases steel slag circulating times, reduces material consumption, improves converter dephosphorizing efficiency, relieves the problem that a semi-steel smelting heat source is insufficient, and reduces steel slag discharge amount.

Description

technical field [0001] The invention relates to the technical field of metallurgy, and in particular to a steelmaking method for gasification and dephosphorization of steel slag in a converter. Background technique [0002] In order to reduce the consumption of auxiliary materials in converter smelting, most converter steelmaking enterprises adopt the operation of "retaining slag". As the number of slag remaining furnaces continues to accumulate, the phosphorus content in steel slag is getting higher and higher, resulting in a decrease in the dephosphorization efficiency of the converter. Therefore, the number of steel slag recycling in the existing "slag leaving" operation generally does not exceed 5 furnaces. At the same time, Panzhihua Iron and Steel uses vanadium-titanium magnetite for smelting. The main raw material for converter steelmaking is semi-steel after vanadium extraction through a special converter. % to 4.0%, the content of silicon and manganese in the semi-...

Claims

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Application Information

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IPC IPC(8): C21C5/28C21C7/064
CPCC21C5/28C21C7/064Y02P10/20
Inventor 陈均喻林曾建华张彦恒
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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