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 th

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0030] Example 1

[0031] A 200t converter in a plant uses semi-steel steelmaking. While the first furnace is smelted and blown, 15kg / t steel of active lime, 15kg of high-magnesium lime and acidic composite slag-making agent are added into the furnace while the first furnace is smelted. The oxygen intensity is 3.0m 3 / t·min, until the end of the blowing, the first anthracite 0.5kg / t steel is added to the furnace before tapping, and slag is splashed after tapping. When the slag is splashed, the top blowing oxygen lance blows nitrogen into the furnace. The gas supply strength is 2m 3 / t·min, bottom blowing nitrogen, gas supply intensity is 0.15m 3 / t·min, the position of the oxygen lance is 0.5m. The second anthracite 0.5kg / t steel is added into the furnace before the slag splashing oxygen lance blows nitrogen, and the slag splashing time is 2min. After the slag splashing, all slag is left for the next furnace smelting.

[0032] The second furnace is smelted according to the method ...

Example Embodiment

[0036] Example 2

[0037] A 200t converter in a plant uses semi-steel steelmaking. When the first furnace is smelted and blown, 20kg / t steel of active lime, 10kg of high-magnesium lime and acidic composite slag-making agent are added to the furnace while the first furnace is smelted. The oxygen intensity is 3.5m 3 / t·min, until the end of the blowing, the first anthracite 1kg / t steel is added to the furnace before tapping, and slag is splashed after tapping. When the slag is splashed, the top blowing oxygen lance blows nitrogen into the furnace, and the gas supply strength is 3m 3 / t·min, bottom blowing nitrogen, gas supply intensity is 0.05m 3 / t·min, the oxygen lance position is 1.0m. The second anthracite 1.5kg / t steel is added to the furnace before the slag splashing oxygen lance blows nitrogen, and the slag splashing time is controlled at 4min. After the slag splashing, all slag is left for the next smelting.

[0038] The second furnace is smelted in accordance with the method...

Example Embodiment

[0042] Example 3

[0043] A 200t converter in a plant uses semi-steel steelmaking. When the first furnace is smelted and blown, 18kg / t of active lime, 12kg of high-magnesium lime and acidic composite slag-making agent are added into the furnace while the first furnace is smelted. The oxygen intensity is 3.2m 3 / t·min, until the end of the blowing, add 0.8kg / t steel of the first anthracite to the furnace before tapping, splash slag after tapping, when the slag is splashed, the top blowing oxygen lance blows nitrogen into the furnace to supply gas Strength is 2.5m 3 / t·min, bottom blowing nitrogen, gas supply intensity is 0.1m 3 / t·min, the position of the oxygen lance is 0.6m. The second anthracite 1kg / t steel is added to the furnace before the slag splashing oxygen lance blows nitrogen, and the slag splashing time is controlled at 3 minutes. After the slag splashing, all slag is left for the next smelting.

[0044] The second furnace is smelted in accordance with the method of the...

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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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