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Converter large scrap ratio smelting composite slagging heat supplementing agent and preparation and use method thereof

A technology of scrap steel ratio and heating agent, which is applied in the field of converter steelmaking, can solve the problems of no heating agent, etc., achieve low heating cost, shorten the smelting cycle, and reduce the consumption of converter heating agent and flux

Active Publication Date: 2022-07-01
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there have been no technical reports on exothermic agents with dual functions of high-efficiency heat supplementation and rapid slagging

Method used

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  • Converter large scrap ratio smelting composite slagging heat supplementing agent and preparation and use method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A composite slag-forming heat supplement for converter smelting with large scrap ratio is prepared from the following raw materials by weight percentage: 55% of silicon-aluminum-calcium-carbon alloy, 10% of sintered calcium aluminate, 8% of wood charcoal, 6% of sintered return ore, Manganese ore 13%, light burning dolomite 7.5%, sodium stearate 0.5%.

[0041] The silicon-aluminum-calcium-carbon alloy is composed of Si, Al, Ca, C and Fe, and the impurity elements are P, S, among which, the weight percentage content range of Si, Al, Ca, and C is: Si, 35%, Al, 12%, Ca, 18%, C, 9%, the weight percentage content range of metal Fe is: 25%, the weight percentage content range of impurity elements P and S is: P≤0.05%, S≤0.1%.

[0042] The composition of sintered calcium aluminate is 12CaO 7Al 2 O 3 , 12CaO 7Al 2 O 3 The weight percent is 85%.

[0043] Among them, wood charcoal is a carbonaceous material obtained by distillation from vitex wood as raw material, sintered ore...

Embodiment 2

[0053]A composite slag-making heat supplement for converter smelting with large scrap ratio is prepared from the following raw materials by weight: 60% of silicon-aluminum-calcium-carbon alloy, 12% of sintered calcium aluminate, 10% of wood charcoal, 5% of sintered ore, Manganese ore 7%, light burning dolomite 5.7%, sodium stearate 0.3%.

[0054] The silicon-aluminum-calcium-carbon alloy is composed of Si, Al, Ca, C and Fe, and the impurity elements are P and S. Among them, the weight percentage of Si, Al, Ca, and C ranges from: Si, 45%, Al, 10%, Ca, 9%, C, 12%, the weight percentage content range of metal Fe is: 24%, the weight percentage content range of impurity elements P and S is: P≤0.05%, S≤0.1%.

[0055] The composition of sintered calcium aluminate is 12CaO 7Al 2 O 3 , 12CaO 7Al 2 O 3 The weight percent is 83%.

[0056] Wood charcoal is a carbonaceous material obtained by distillation from wood chips as raw material. The sintered ore is the sintered sinter after c...

Embodiment 3

[0066] A composite slag-making heat supplement for converter high-waste steel ratio smelting is prepared from the following raw materials by weight percentage: 58% of silicon-aluminum-calcium-carbon alloy, 15% of sintered calcium aluminate, 5% of wood charcoal, 6.6% of sintered return ore, Manganese ore 10%, light burning dolomite 5%, sodium stearate 0.4%.

[0067] The silicon-aluminum-calcium-carbon alloy is composed of Si, Al, Ca, C and Fe, and the impurity elements are P and S. Among them, the weight percentage of Si, Al, Ca, and C ranges from: Si, 43%, Al, 10%, Ca, 19%, C, 12%, the weight percentage content range of metal Fe is: 15%, the weight percentage content range of impurity elements P and S are: P≤0.05%, S≤0.1%.

[0068] The composition of sintered calcium aluminate is 12CaO 7Al 2 O 3 , 12CaO 7Al 2 O 3 The weight percent is 82%.

[0069] Wood charcoal is a carbonaceous material obtained by distillation from wood blocks as raw materials. The sintered ore is the ...

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Abstract

The invention relates to the technical field of converter steelmaking, and discloses a converter large scrap ratio smelting composite slagging heat supplementing agent which is prepared from the following raw materials in percentage by weight: 55-60% of silicon-aluminum-calcium-carbon alloy, 10-15% of sintered calcium aluminate, 5-10% of wood charcoal, 5-10% of sintered return mine, 10-15% of manganese ore, 5-10% of light-burned dolomite and 0.3-0.5% of sodium stearate. The invention further discloses a preparation method and a use method of the converter large scrap ratio smelting composite slagging heat supplementing agent. The converter large scrap ratio smelting composite slagging heat supplementing agent and the preparation and use method thereof have the advantages that converter oxygen blowing combustion is stable, heat supplementing efficiency is high, heat supplementing cost is low, converter slagging speed is high, dephosphorization efficiency is high, and the content of harmful elements and residual elements in molten steel is not increased; and the purpose of high-quality, high-efficiency, low-cost and low-carbon green smelting of the converter with large scrap ratio is

Description

technical field [0001] The invention relates to the technical field of converter steelmaking, in particular to a composite slag-making heat supplement for converter smelting with a large scrap ratio and a method for preparing and using the same. Background technique [0002] For iron and steel complex enterprises, how to reduce the ratio of molten iron in converters and increase the ratio of scrap steel has become an urgent need for low-carbon and green development of enterprises. Due to the increase of the scrap ratio of the converter, it means that the amount of molten iron into the furnace and the physical heat and chemical heat brought by it will decrease, which will lead to insufficient heat in the converter steelmaking. In order to ensure the smooth progress of the smelting process, adding exothermic agents or excessive blowing Oxygen temperature rises for heat supplementation; due to excessive oxygen blowing, molten steel will be overoxidized, steel material consumpti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/00
CPCC21C7/005C21C7/0025Y02P10/20
Inventor 欧阳德刚沈继胜孙伟朱万军赵元周甫肖邦志苏尚飞
Owner 武汉钢铁有限公司
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