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A kind of desiliconizing agent for pretreatment of hot metal outside blast furnace and its preparation and use method

A technology of molten iron pretreatment and desilication agent, applied in the field of iron and steel metallurgy, can solve the problems of low desiliconization efficiency, serious temperature drop of molten iron, long time consumption, etc. obvious effect

Active Publication Date: 2021-05-28
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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  • A kind of desiliconizing agent for pretreatment of hot metal outside blast furnace and its preparation and use method
  • A kind of desiliconizing agent for pretreatment of hot metal outside blast furnace and its preparation and use method

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preparation example Construction

[0037] The preparation method of described a kind of hot metal pretreatment desiliconization agent outside blast furnace comprises the following steps:

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

[0039] b) Make the mixed powder in the inner layer into agglomerates of 5 mm to 30 mm through pelletizing or briquetting equipment;

[0040] c) The agglomerates obtained in step b and the mixed powder of the outer layer are made into 10mm-40mm composite agglomerates through pelletizing equipment, dried unt...

Embodiment 1

[0046] In this example, when preparing the desiliconization agent for pretreatment of molten iron outside the blast furnace, the ingredients are formulated according to the formulas of the inner layer of the mixture and the outer layer of the mixture, and the required raw materials are crushed, rolled, and ground to make the particles with a particle size of less than 0.074mm The proportion 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 to stir and mix evenly, and dry the prepared inner layer mixed powder and outer layer mixed powder respectively for later use ; The inner layer mixed powder is made into 5mm~30mm agglomerates through pelletizing or pressing equipment; the prepared agglomerate and the outer layer mixed powder are made into 10mm~40mm composite agglomerates through pelletizing equipment, and dried When the water content is less than 1%, set aside. ...

Embodiment 2

[0051] In this example, when preparing the desiliconization agent for pretreatment of molten iron outside the blast furnace, the ingredients are formulated according to the formulas of the inner layer of the mixture and the outer layer of the mixture, and the required raw materials are crushed, rolled, and ground to make the particles with a particle size of less than 0.074mm The proportion 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 to stir and mix evenly, and dry the prepared inner layer mixed powder and outer layer mixed powder respectively for later use ; The inner layer mixed powder is made into 5mm~30mm agglomerates through pelletizing or pressing equipment; the prepared agglomerate and the outer layer mixed powder are made into 10mm~40mm composite agglomerates through pelletizing equipment, and dried When the water content is less than 1%, set aside. ...

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Abstract

The invention relates to a desiliconization agent for pretreatment of molten iron outside a blast furnace and its preparation and use method. The desiliconization agent is a composite agglomerate composed of an inner layer of a mixture and an outer layer of a mixture, wherein the composition of the inner layer of the mixture and Its mass percentage is: blast furnace dedusting ash 0-40%, coking dedusting ash 0-25%, fluorite powder 10%-30%, binder 0-5%, and the rest is sintering dedusting ash, converter dedusting ash, rolled steel sheet one or more; the composition and mass percentage of the outer layer of the mixture are: 50% to 85% of iron ore concentrate, 10% to 45% of quicklime, and 0.5% to 10% of binder; the present invention can solve the current problem The low desiliconization efficiency and long time-consuming existing in the technology lead to the serious problem of molten iron temperature drop. At the same time, the solid waste resources of the iron and steel enterprises are fully utilized, and there is no need to add special devices or injection equipment, and there is no need to purchase additional special desiliconization Agent materials, so as to achieve low-cost and simple and effective desiliconization of molten iron.

Description

technical field [0001] The invention relates to the technical field of iron and steel metallurgy, in particular to a desiliconizing agent for pretreatment of molten iron outside a blast furnace and methods for preparing and using the same. Background technique [0002] With the advancement of science and technology and the development of social economy, iron and steel enterprises are required to provide better steel products, including the strict control of the content of harmful elements such as sulfur in steel; and with the increasing development of steelmaking technology, molten iron pretreatment has been From the initial single desulphurization to desiliconization, dephosphorization, desulphurization, that is, the "full treatment" technology of molten iron, among which the pretreatment desiliconization of molten iron with high silicon content is beneficial to reduce steelmaking costs and improve smelting quality. [0003] Desiliconization of molten iron is divided into t...

Claims

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Application Information

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Patent Type & Authority Patents(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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