Blast furnace external molten iron pretreatment desiliconization agent, and preparation method and use method thereof

A technology of molten iron pretreatment and desiliconization agent, which is applied in the field of iron and steel metallurgy, can solve the problems of low desiliconization efficiency, serious temperature drop of molten iron, and long time consumption, and achieve good desiliconization effect, effective recycling, and stable temperature drop of molten iron obvious effect
CN108929931AActive Publication Date: 2018-12-04ANGANG STEEL CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
ANGANG STEEL CO LTD
Publication Date
2018-12-04

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Abstract

The invention relates to a blast furnace external molten iron pretreatment desiliconization agent, and a preparation method and a use method thereof. The desiliconization agent is a composite agglomerate composed of an inner mixture layer and an outer mixture layer, wherein the inner mixture layer comprises, by mass, 0-40% of blast furnace fly ash, 0-25% of coking fly ash, 10-30% of fluorite powder, 0-5% of a binder, and the balance of one or more of sintered fly ash, converter fly ash and steel rolling iron sheet; and the outer mixture layer comprises, by mass, 50-85% of iron concentrate, 10-45% of quicklime and 0.5-10% of the binder. The problems of sever temperature decrease of molten iron, caused by low desiliconization efficiency and long time in the prior art, are solved, the self solid waste resources of steel enterprises are fully utilized, a special device or a blowing device does not need to be additionally mounted, and extra purchasing of a special desiliconization agent material is not needed, so cheap, simple and effective desiliconization of molten iron is achieved.
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Description

Technical field

[0001] The invention relates to the technical field of iron and steel metallurgy, in particular to a desiliconizer for pretreatment of molten iron outside a blast furnace and a preparation and use method thereof. Background technique

[0002] With the advancement of science and technology and the development of social economy, steel companies are required to provide better quality steel, including the need to strictly control the content of harmful elements such as sulfur in steel; and with the increasing development of steelmaking technology, hot metal pretreatment has been From the initial single desulfurization to desiliconization, dephosphorization, and desulfurization, that is, the "full treatment" technology of molten iron, the pretreatment and desiliconization of molten iron with high silicon content is beneficial to reduce steelmaking costs and improve smelting quality.

[0003] Hot metal desiliconization is divided into two types: desiliconization in the bl...

Claims

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