Treatment method for slag adjustment before slag splashing protection of converters

A treatment method and slag adjustment technology, which is applied in the field of iron and steel metallurgy, can solve the problems of poor high temperature resistance of the slag splash layer, poor slag corrosion performance, poor slag hanging effect, and high slag temperature, so as to improve production efficiency and protect the furnace by slag splashing , Improving the life of the slag layer and the effect of increasing the furnace life

Inactive Publication Date: 2012-03-28
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a slag adjustment treatment method before converter slag splashing to protect the furnace, so as to solve the problem of implementing slag splashing to protect the furnace in the case of high tapping temperature and high iron oxide content in the smelting final slag in the current small and medium-sized converter steelmaking. The problems of high slag temperature, low viscosity, poor slag hanging effect, high temperature resistance of slag splash layer and poor slag erosion performance

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Implement the operating steps of the present invention as follows:

[0029] (1) At the end of converter blowing, the converter was shaken to the side where the slag was poured, and the sampling analysis showed that the iron oxide in the slag was 30%;

[0030] (2) Tapping at 1700°C, the tapping operation is carried out by leaving slag but not steel, and the amount of slag left is controlled at 6% of the volume capacity of the converter, and the amount of slag is about 600Kg according to calculation;

[0031] (3) After the steel is tapped, shake the converter upright and add a slag adjusting agent for protecting the furnace by splashing slag into the furnace. The slag adjusting agent is: 40Kg of coke powder, 60Kg of magnesia, and 20Kg of titanium dioxide. After subsequent analysis, it is known that the slag adjusting agent The composition of the slag is: MgO15%, iron oxide 7.7%, titanium compound 3.5%;

[0032] (4) After adding the slag adjusting agent, use an oxygen lan...

Embodiment 2

[0035] Implement the operating steps of the present invention as follows:

[0036] (1) At the end of converter blowing, the converter was shaken to the side where the slag was poured, and the sampling analysis showed that the iron oxide in the slag was 25%;

[0037] (2) The steel is tapped at 1720°C, and the steel tapping is operated by leaving slag but not steel, and the amount of slag left is controlled at 8% of the volume capacity of the converter, and the amount of slag is about 800Kg according to calculation;

[0038](3) After the steel is tapped, shake the converter upright and add a slag adjusting agent for protecting the furnace by splashing slag into the furnace. The slag adjusting agent is: 30Kg of coke powder, 70Kg of magnesia, and 25Kg of titanium dioxide. After subsequent analysis, it is known that the slag adjusting agent The composition of the slag is: MgO10%, iron oxide 6.1%, titanium compound 3.0%;

[0039] (4) After adding the slag adjusting agent, use an ox...

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Abstract

The invention belongs to the technical field of steel making and provides a treatment method for slag adjustment before slag splashing protection of converters, which is used for solving the existing problems of bad slag hanging effect in high iron oxide type slag splashing protection after high-temperature steel tapping and short lining life. The method provided by the invention is characterized in that: coke powder, magnesite and titanium white are used as slag adjustment agents; the coke powder is capable of decreasing the ferric oxide in residual slag and reacting with the titanium white to generated titanium carbide with high melting point; and the titanium carbide acts synergistically with the magnesite to increase the viscosity and the melting temperature of the slag. Therefore, by using the invention, the adherence stability and high temperature and slag steel erosion resistance of the slag on furnace walls can be markedly improved, the slag splashing protection effect can be improved and the lining life of the converters can be greatly prolonged.

Description

technical field [0001] The invention belongs to the field of iron and steel metallurgy, and in particular relates to a slag adjustment treatment method before converter slag splashing to protect the furnace, which is adopted in converter steelmaking to improve the service life of the furnace lining. Background technique [0002] American LTV Steel Company first invented the converter slag splash protection method, which is to leave part of the final slag after the converter is tapped, and add an appropriate amount of slag adjusting agent to make the slag have a suitable viscosity and high refractoriness, and then The slag is sprayed with high-pressure nitrogen, so that the slag sputters and adheres to the furnace wall to form a new refractory and anti-corrosion layer, thereby achieving the purpose of protecting the furnace lining and increasing the furnace life; generally speaking, the furnace life is very long when the furnace is not protected by slag splash At least more t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/36
Inventor 李桂荣王宏明张冕杨丽莉袁雪婷蔡云肖杰周玉赵加爱曹磊朱祥
Owner JIANGSU UNIV
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