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Method for removing silicon in molten iron

A molten iron and removal technology, which is applied in the field of pre-desilication of molten iron using KR method, can solve the problems of unfavorable metal material yield, large amount of desilication agent added, and increased amount of desilication slag, etc. The effect of avoiding slag foaming and reducing waste of resources

Inactive Publication Date: 2017-05-31
SHANDONG IRON & STEEL CO LTD
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Problems solved by technology

However, if the total oxygen content is low, the desiliconization efficiency will be affected, resulting in a large amount of desiliconization agent added, which not only increases the amount of desiliconization slag, but also is not conducive to improving the yield of metal materials, and also causes the temperature drop of molten iron to be too large

Method used

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  • Method for removing silicon in molten iron
  • Method for removing silicon in molten iron
  • Method for removing silicon in molten iron

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Experimental program
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Effect test

Embodiment 1

[0036] 1) 3-22990 heats of molten iron entered the station, sampling and testing the composition of the molten iron, the analysis result was Si: 0.81%, the measured temperature of the molten iron was 1365°C, and the weight of the molten iron was 130t.

[0037] 2) Transport the molten iron tank to the desulfurization position to start the desiliconization operation: run at a paddle speed of 80 rpm for 1 minute, 110 rpm for 2-8 minutes, and 70 rpm for the 9th minute; the depth of the stirring head is 1700mm; The feed rate was 195kg / min in the first 8 minutes, no feed was added in the 9th minute, and the desiliconization agent was a composite desiliconization agent.

[0038] The desiliconization agent is prepared according to the aforementioned ratio. Specifically, the mixture: iron oxide scale = 1:5 ~ 1:4 can be used as the desiliconization agent, wherein CaO: CaF in the mixture 2 =9:1, see the table below for the composition of iron oxide scale.

[0039] Rolled Steel ...

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Abstract

The invention discloses a method for pre-desiliconization of molten iron through a KR method and relates to a method for removing silicon in molten iron. The method comprises the step of adding a desiliconization agent to molten iron in a molten iron tank so as to remove silicon in the molten iron while mechanical stirring is carried out, specifically, the silicon content of the molten iron is 0.7-1.2 wt%. By means of the method, the silicon content of the molten iron in a furnace is stabilized, consumption of slag and steel and iron materials of a converter is reduced, and meanwhile, the purposes of reducing converter splashing and low-cost steelmaking are achieved.

Description

technical field [0001] The invention belongs to the field of pretreatment of molten iron produced by metallurgy, and in particular relates to a method for pre-desiliconizing molten iron using the KR method. Background technique [0002] For a long time, the steelmaking industry has regarded silicon in molten iron as one of the main heat sources for converter steelmaking. However, through the calculation of related reaction heat effects, it can be seen that silicon in molten iron is not the most important heat source for converter steelmaking. Although the oxidation reaction of silicon can release a lot of heat, a certain amount of lime must be added to adjust the alkalinity of the slag. The heating and melting of lime needs to absorb a lot of heat, which takes up most of the heat generated by the oxidation of molten iron silicon, and the molten iron silicon reacts violently in the furnace. The oxidation of molten iron silicon is basically completed within 5 minutes of oxygen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/04
CPCC21C7/04
Inventor 张百庆刘文凭王强魏义胜任科社赵圣功宁伟王玉春王尖锐乔明张昭平苗金鹏梁景玥
Owner SHANDONG IRON & STEEL CO LTD
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