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Desulfurization slag modifier and molten iron desulfurization method

A modifier and desulfurization slag technology, applied in the field of desulfurization slag modifier and molten steel desulfurization, can solve the problems of serious cooling of molten iron, long slag removal time, affecting the desulfurization efficiency of molten steel, etc., and achieve lower melting point and viscosity, strong desulfurization ability Effect

Active Publication Date: 2022-03-29
湖南华菱涟源钢铁有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] This application provides a desulfurization slag modifier and molten steel desulfurization method, aiming to solve the problem that the slag removal time is too long before molten steel desulfurization, which leads to serious cooling of molten iron and affects the desulfurization of molten steel efficiency problem

Method used

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Examples

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Effect test

preparation example Construction

[0046] Preparation of desulfurization slag modifier

[0047] The preparation steps of the desulfurization slag modifier include: mixing the three raw materials of soda powder, lime powder and fluorite powder according to the above ratio through a ball mill mixer to prepare the desulfurization slag modifier.

[0048] In some embodiments, the milling time and milling speed of the ball mill can be controlled to obtain the desulfurization slag modifier with the desired particle size.

[0049] According to the embodiments of the present invention, the preparation method of the desulfurization slag modifier is simple in process, and the prepared material system of the desulfurization slag modifier is stable.

[0050] Hot metal desulfurization method

[0051] An embodiment of another aspect of the present invention provides a method for desulfurizing molten iron, comprising the steps of:

[0052] (1) adding the above-mentioned desulfurization slag modifier into the ladle, and s...

Embodiment 1

[0068] The raw material components of the desulfurization slag modifier include: 60-70wt% of soda powder, 20-25wt% of lime powder, 10-15wt% of fluorite powder, wherein Na 2 CO 3 The weight percentage of CaO in lime powder is not less than 90wt%; the weight percentage of CaO in lime powder is not less than 80wt%; the weight percentage of CaF in fluorite powder 2 The weight percentage content of not less than 80wt%.

[0069] The raw material components in the above ratio are ball milled in a ball mill and mixed uniformly until the desulfurization slag modifier with an average particle size not greater than 1mm is obtained.

[0070] Using the above-mentioned desulfurization slag modifier for desulfurization includes the following steps:

[0071] (1) Keep 10-15wt% of the former slag in the ladle, add the above-mentioned desulfurization slag modifier into the ladle, and stir the former slag in the ladle for 20-30 seconds;

[0072] (2) Stir the molten iron in the ladle with a sti...

Embodiment 2

[0075] The raw material components of the desulfurization slag modifier include: 60-70wt% of soda powder, 15-20wt% of lime powder, 10-15wt% of fluorite powder, wherein Na 2 CO 3 The weight percentage of CaO in lime powder is not less than 90wt%; the weight percentage of CaO in lime powder is not less than 80wt%; the weight percentage of CaF in fluorite powder 2 The weight percentage content of not less than 80wt%.

[0076] The raw material components in the above ratio are ball milled in a ball mill and mixed uniformly until the desulfurization slag modifier with an average particle size not greater than 1mm is obtained.

[0077] Using the above-mentioned desulfurization slag modifier for desulfurization includes the following steps:

[0078] (1) Keep 10-15wt% of the former slag in the ladle, add the above-mentioned desulfurization slag modifier into the ladle, and stir the former slag in the ladle for 20-30 seconds;

[0079] (2) Stir the molten iron in the ladle with a sti...

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Abstract

The invention provides a desulfurized slag modifier and a molten iron desulfurization method, and the desulfurized slag modifier comprises the following raw material components in 100 parts by weight: 60-75 parts by weight of soda ash with the Na2CO3 weight percentage of not less than 90 wt%; the weight percentage of CaO in the lime powder is not less than 80wt%; the content of CaF2 in the fluorite powder is not less than 80 wt%, and the content of CaF2 in the fluorite powder is 10-15 parts. When the desulfurization slag modifier provided by the invention is used for desulfurization, a part of pre-slag can be reserved in a ladle, and the desulfurization slag modifier can modify the pre-slag, so that the desulfurization capacity of the pre-slag is improved, the slagging-off time of the pre-slag is shortened, the temperature of molten iron is prevented from being too high, the desulfurization efficiency is effectively improved, and remarkable economic benefits are brought to enterprises.

Description

technical field [0001] The application relates to the technical field of molten iron pretreatment, in particular to a desulfurization slag modifier and a molten steel desulfurization method. Background technique [0002] With the rapid development of science and technology and the steel industry, modern industry has higher and higher requirements for steel quality. S is a harmful element in steel, which will reduce the plasticity and toughness of steel, and easily cause hot embrittlement of steel products. Hot metal pretreatment desulfurization is an important technological means to improve the quality of steel products, expand steel varieties and reduce costs in modern steelmaking production. At present, the commonly used hot metal pretreatment desulfurization methods mainly include injection method and KR method. [0003] Before using the existing desulfurizer for desulfurization by the KR method, the front slag in the ladle must be cleaned, otherwise there will be too mu...

Claims

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Application Information

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IPC IPC(8): C21C1/02C21C7/064
CPCC21C1/025C21C7/0645C21C7/0037Y02P10/20
Inventor 周剑丰齐江华邓必荣李明晖罗钢梁亮劳栋陈杰苏风光成志强
Owner 湖南华菱涟源钢铁有限公司
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