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Short process method of recycling LF liquid refining slag in thermal-state steel ladle

A technology for refining slag and short process, applied in the field of iron and steel metallurgy, can solve the problems of the sulfur distribution coefficient not reaching the theoretical equilibrium value, waste, and insufficient utilization of slag materials.

Inactive Publication Date: 2016-09-28
SHANDONG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the limitations of initial sulfur and refining time, the added slag was not fully utilized, and the sulfur distribution coefficient was far from reaching the theoretical equilibrium value, resulting in a lot of waste. If the refining slag can be reused, it can be greatly improved. Reduce refining costs

Method used

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Effect test

Embodiment 1

[0029] A short process method for recycling LF furnace liquid refining slag in a hot ladle, comprising the following steps:

[0030] 1) After the molten steel refined by the LF furnace is poured on the casting machine, the liquid refining slag of the LF furnace in the ladle continues to be left in the ladle; the liquid refining slag of the LF furnace includes the following components by weight percentage: 16.5% SiO 2 ; 56.5% CaO; 7.5% MgO; 15.5% Al 2 o 3 ; 0.45% TFe; 0.65% S; 0.055% P;

[0031] 2) Pour the LF furnace liquid refining slag retained in the ladle in step 1) into the ladle containing the molten steel to be refined in the LF furnace; the entering temperature of the molten steel to be refined in the LF furnace is 1580°C;

[0032] 3) The molten steel to be refined in the LF furnace mixed with the liquid refining slag of the LF furnace in step 2) is hoisted to the station of the LF refining furnace, and the refining operation of the LF furnace is carried out to obtai...

Embodiment 2

[0035] A short process method for recycling LF furnace liquid refining slag in a hot ladle, comprising the following steps:

[0036] 1) After the molten steel refined by the LF furnace is poured on the casting machine, the liquid refining slag of the LF furnace in the ladle continues to be left in the ladle; the liquid refining slag of the LF furnace includes the following components by weight percentage: 18.5% SiO 2 ; 54.5% CaO; 9.5% MgO; 13.5% Al 2 o 3 ; 0.65% TFe; 0.45% S; 0.075% P;

[0037] 2) Pour the LF furnace liquid refining slag retained in the ladle in step 1) into the ladle containing the molten steel to be refined in the LF furnace; the entering temperature of the molten steel to be refined in the LF furnace is 1569°C;

[0038] 3) The molten steel to be refined in the LF furnace mixed with the liquid refining slag of the LF furnace in step 2) is hoisted to the station of the LF refining furnace, and the refining operation of the LF furnace is carried out to obtai...

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Abstract

The invention provides a short process method of recycling LF liquid refining slag in a thermal-state steel ladle. After molten steel is refined through new slag manufactured for the first time, the sulphur distribution coefficient of the slag and steel is far lower than a theoretical balance value, and the slag can be reused. After the molten steel is poured completely, through hoisting with a crown block, the liquid refining slag is mixed with the molten steel to be refined with the LF, and then the mixed molten steel is hoisted to the LF to be subjected to refining operation. Consumption of lime and fluorite can be reduced, rapid slagging is realized through the physical heat of the slag, electricity consumption is lowered, the cost can be reduced by 5 yuan per ton of steel, and residual molten steel obtained after pouring with a casting machine can be recycled.

Description

technical field [0001] The invention relates to the technical field of iron and steel metallurgy, in particular to a short-flow method for recycling liquid refining slag from an LF furnace in a hot ladle. Background technique [0002] An important process link in the refining process of the LF furnace is slagging, through which harmful elements such as sulfur and oxygen in molten steel are transferred to steel slag for removal. However, due to the limitations of initial sulfur and refining time, the added slag was not fully utilized, and the sulfur distribution coefficient was far from reaching the theoretical equilibrium value, resulting in a lot of waste. If the refining slag can be reused, it can be greatly improved. Reduce refining costs. [0003] Therefore, how to effectively improve the utilization rate of slag in the refining process of the LF furnace and reduce the refining cost is a technical problem urgently needed to be solved by those skilled in the art. Conte...

Claims

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Application Information

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IPC IPC(8): C21C7/076
CPCC21C7/076Y02P10/20
Inventor 于海燕尹卫平高龙永刘聪付庆林杜泽国杨晓清张贺全刘正华汤晓辉
Owner SHANDONG IRON & STEEL CO LTD
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