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Method for improving furnace age of converter

A technology of converter and furnace life, which is applied in the field of metallurgy, can solve problems such as the influence of converter life, poor oxidation resistance, and converter lining erosion, and achieve the effect of realizing green cycle, reducing TFe content and increasing furnace life

Inactive Publication Date: 2018-07-06
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

As we all know, the disadvantage of magnesia carbon brick is its poor oxidation resistance. There are three main reasons for C oxidation: (1) C and FeO and CO rich in slag 2 Reaction; (2) C with blown O 2 Direct reaction; (3) Reduction reaction of C with MgO in magnesia carbon bricks at high temperature
Therefore, the lining of the converter is severely eroded, which has a serious impact on the life of the converter, and steel breakouts occur

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] 120t converter smelting, after the steel is tapped, add dolomite 6kg / t steel, splash slag to protect the furnace, after the converter is mixed with semi-steel, add active lime 12kg / t steel, high magnesium lime 12kg and acid Composite slagging agent 3kg / t steel, and add converter waste slag 6kg / t steel, oxygen lance nozzle is 1.4~2m away from the molten pool metal liquid level. 1.4m ~ 1.8m, the position of the carbon gun is 1.4m, to ensure that the slag has good fluidity, so as to reduce the slag early, remove more phosphorus and protect the furnace lining; when the oxygen blowing progress is controlled to 0 ~ 40%, the oxygen lance supplies oxygen The strength is 2.5~3.0m 3 / (t steel min), the oxygen blowing progress is 40% to the end of blowing, the oxygen supply intensity is 3.5~4.5m 3 / (t steel·min), control the basicity of slag at the end point to be 3~4, after the blowing is completed, the molten steel and slag at the end point are obtained.

[0035] The temperatu...

Embodiment 2

[0037] 120t converter smelting, after the steel is tapped, add dolomite 7kg / t steel, splash slag to protect the furnace, after the converter is mixed with semi-steel, add active lime 13kg / t steel, high magnesium lime 13kg and acid Composite slagging agent 5kg / t steel, and add converter waste slag 7kg / t steel, the oxygen lance nozzle is 1.4~2m away from the metal liquid level of the molten pool. 1.4m ~ 1.8m, the position of the carbon gun is 1.4m, to ensure that the slag has good fluidity, so as to reduce the slag early, remove more phosphorus and protect the furnace lining; when the oxygen blowing progress is controlled to 0 ~ 40%, the oxygen lance supplies oxygen The strength is 2.5~3.0m 3 / (t steel min), the oxygen blowing progress is 40% to the end of blowing, the oxygen supply intensity is 3.5~4.5m 3 / (t steel·min), control the basicity of slag at the end point to be 3~4, after the blowing is completed, the molten steel and slag at the end point are obtained.

[0038] Th...

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Abstract

The invention discloses a method for improving the furnace age of a converter and belongs to the technical field of metallurgy. In order to improve the furnace age of the converter, the invention provides the method for improving the furnace age of the converter; the method comprises the following steps: adding dolomite into the converter; after blending semi-steel into the converter; blowing andadding active lime, dolomitic lime, an acidic composite slag forming agent and converter waste residues into the converter; controlling a lance position and oxygen blowing strength of an oxygen lanceand controlling the alkalinity of terminal-point furnace slag to 3 to 4, so as to obtain terminal-point molten steel and terminal-point slag. According to the method disclosed by the invention, the dolomite is used for producing the slag and the converter waste residues are added to replace part of metallurgy auxiliary materials, so that the content of TFe in the terminal-point slag is reduced, the tapping temperature is reduced and the terminal-point carbon content is improved; the furnace age of the converter is remarkably improved and the smelting effect is not influenced.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for increasing the service life of a converter. Background technique [0002] my country is a big country of vanadium-titanium magnetite, with rich resources of vanadium-titanium magnetite. Domestic iron and steel enterprises such as Panzhihua Iron and Steel, Chenggang, Kunming Iron and Steel, and Weiyang Iron and Steel all use vanadium-titanium magnetite for smelting, and the main raw material for converter steelmaking It adopts semi-steel after vanadium extraction by special converter. The permanent lining material of converter cap is sintered magnesia brick, the material of working layer is aluminum magnesia carbon brick, and the permanent layer of furnace body is sintered magnesia brick. As we all know, the disadvantage of magnesia carbon brick is its poor oxidation resistance. There are three main reasons for C oxidation: (1) C and FeO and CO rich in s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/28
CPCC21C5/28
Inventor 陈路曾建华梁新腾王建
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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