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Method for reducing free oxygen content of end point molten steel of converter

A converter end point and oxygen content technology, which is applied in the field of mining and smelting, can solve the problems of low gas supply intensity at the bottom and high excess oxygen content in molten steel, and achieve the effects of reducing alloy cost, improving molten steel quality, and improving gas supply strength.

Active Publication Date: 2021-08-06
GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
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Problems solved by technology

[0003] The purpose of the present invention is to provide a method for reducing the free oxygen content of molten steel at the end of the converter in view of the problems existing in the prior art, which solves the problems of low bottom gas supply intensity and relatively high excess oxygen content in molten steel existing in existing converter steelmaking. higher question

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Embodiment Construction

[0015] The technical solution of the present invention will be described below in conjunction with the implementation methods.

[0016] A method for reducing the free oxygen content of molten steel at the end of a converter, comprising the steps of:

[0017] a. On the basis of the bottom blowing air brick at the bottom of the converter, add 2 or more bottom blowing lances, using nitrogen, argon, CO 2 As a carrier, lime powder is sprayed into the converter from the spray gun;

[0018] b. Divide the blowing process into three stages of "early-middle-late",

[0019] Among them, the gas supply in the early stage is 60% O 2 +40%N 2 , its purpose is to quickly supply oxidation slag;

[0020] Mid-term gas supply is 40% O 2 +60%CO 2 , the purpose of which is to reduce the proportion of oxygen to prevent splashing;

[0021] The later gas supply is 70% CO 2 +30%O 2 , in which CO is blown into the middle and late stages 2 Gases whose purpose is to rapidly decarburize with risin...

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Abstract

The invention provides a method for reducing the free oxygen content of end point molten steel of a converter. The method is characterized in that a bottom blowing powder spraying system is added on the basis of the traditional converter, so that the purpose of improving the gas supply intensity of bottom blowing powder spraying is achieved; the decarburization speed is effectively improved through a strong bottom blowing system, the oxygen consumption is reduced, and the end point excess oxygen content is reduced; and the bottom blowing powder spraying system is utilized, in the middle and later periods of smelting, a part of Ar gas and CO2 mixed gas is blown into the converter through a bottom blowing spray gun, the stirring strength of a molten pool is increased due to the use of CO2, the stirring strength is increased mainly by utilizing the chemical characteristic that 1m < 3 > of CO2 gas generates 2m < 3 > of CO gas, the free oxygen content of the end point molten steel is reduced through the two aspects, the end point free oxygen is reduced, the total amount of inclusions in the molten steel is reduced from the source, the quality is improved, and meanwhile the alloy cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of mining and smelting, and relates to a method for reducing the free oxygen content of molten steel at the end point of a converter. Background technique [0002] At present, converter steelmaking is mostly carried out by top-bottom double-blowing converter. The method used for top-bottom double-blowing converter steelmaking is to use the converter top oxygen blowing lance to blow oxygen to the molten pool, and the bottom of the converter to blow nitrogen into the molten pool through the gas supply element. , argon to complete the stirring of steel slag, but the gas supply intensity at the bottom is low, and the excess oxygen content in molten steel is relatively high. Contents of the invention [0003] The purpose of the present invention is to provide a method for reducing the free oxygen content of molten steel at the end of the converter in view of the problems existing in the prior art, which solves ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/34C21C7/06
CPCC21C5/34C21C7/0037C21C7/06Y02P40/40
Inventor 茹作栋张英嘉王春江韩志国赵志银
Owner GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
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