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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

Active Publication Date: 2018-12-04
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The invention provides a desiliconization agent for pretreatment of molten iron outside the blast furnace and its preparation and use method, which can solve the problems of low desiliconization efficiency and long time consumption in the prior art, resulting in serious temperature drop of molten iron, and at the same time make full use of iron and steel enterprises Its own solid waste resources do not need to add special devices or injection equipment, and do not need to purchase additional special desiliconization agent materials, so as to realize low-cost, simple and effective desiliconization treatment of molten iron

Method used

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

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preparation example Construction

[0037] The method for preparing a desiliconizer for pretreatment of molten iron outside a blast furnace includes the following steps:

[0038] a) According to the formula of the inner layer of the mixture and the outer layer of the mixture separately, the required raw materials are crushed, rolled, and ground to make the proportion of the particle size less than 0.074mm reach more than 70%; then the raw materials of the inner layer of the mixture The raw materials of the outer layer and the outer layer of the mixture are separately put into the mixing equipment and mixed evenly, and the inner mixed powder and the outer mixed powder are dried separately for use;

[0039] b) The inner mixed powder is made into agglomerates of 5mm~30mm through pelletizing or pressing equipment;

[0040] c) The agglomerates prepared in step b and the outer layer mixed powder are made into 10mm-40mm composite agglomerates through pelletizing equipment, dried until the moisture content is less than 1%, and...

Embodiment 1

[0046] In this embodiment, when preparing the desiliconizer for pretreatment of molten iron outside the blast furnace, the ingredients are separately prepared according to the formula of the inner layer of the mixture and the outer layer of the mixture, and the required raw materials are crushed, rolled, and ground, so that the particle size is less than 0.074mm. The ratio reaches more than 70%; then put the raw materials of the inner layer of the mixture and the raw materials of the outer layer of the mixture into the mixing equipment and mix them evenly, and dry the prepared inner and outer mixed powders separately for use ; The inner layer mixed powder is made into agglomerates of 5mm~30mm through pelletizing or pressing equipment; the obtained agglomerates and the outer layer mixed powder are made into 10mm~40mm composite agglomerates through pelletizing equipment, and dried Until the moisture is less than 1%, set aside.

[0047] In this embodiment, the composition and mass p...

Embodiment 2

[0051] In this embodiment, when preparing the desiliconizer for pretreatment of molten iron outside the blast furnace, the ingredients are separately prepared according to the formula of the inner layer of the mixture and the outer layer of the mixture, and the required raw materials are crushed, rolled, and ground, so that the particle size is less than 0.074mm. The ratio reaches more than 70%; then put the raw materials of the inner layer of the mixture and the raw materials of the outer layer of the mixture into the mixing equipment and mix them evenly, and dry the prepared inner and outer mixed powders separately for use ; The inner layer mixed powder is made into agglomerates of 5mm~30mm through pelletizing or pressing equipment; the obtained agglomerates and the outer layer mixed powder are made into 10mm~40mm composite agglomerates through pelletizing equipment, and dried Until the moisture is less than 1%, set aside.

[0052] In this embodiment, the composition of the inn...

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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.

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C1/04C21C7/04B22D1/00
CPCB22D1/00C21C1/04C21C7/04
Inventor 张伟张立国张延辉王再义李金莲江治飞任伟韩子文王亮邓伟
Owner ANGANG STEEL CO LTD
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