Control method for realizing ultralow iron oxide in converter terminal slag
A converter end point and control method technology, applied in the field of mining, smelting and smelting, can solve the problems of large metal loss and high iron oxide content, and achieve the effect of meeting the end point tapping requirements
Active Publication Date: 2021-08-10
GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
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[0003] The purpose of the present invention is to address the problems existing in the prior art, to provide a control method for realizing ultra-low iron oxide in the slag at the end of the converter, and to solve the problem of high iron oxide content in the slag and large metal loss in the existing converter steelmaking process question
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[0014] The technical solution of the present invention will be described below in conjunction with the implementation methods.
[0015] A control method for realizing ultra-low iron oxide in slag at the end of the converter, comprising the following steps:
[0016] a. On the basis of the bottom blowing air brick at the bottom of the original converter, add 2 bottom blowing lances, using nitrogen, argon, CO 2 As a carrier, lime powder is sprayed into the converter from the spray gun;
[0017] b. Divide the blowing process into three stages of "early-middle-late", wherein,
[0018] The gas supply in the early stage is 60%O 2 +40%N 2 , mainly used for rapid oxidation slag supply;
[0019] Mid-term gas supply is 40% O 2 +60%N 2 / CO 2 , mainly used to prevent the drop of oxygen ratio in the medium term and prevent splashing;
[0020] The later gas supply is 70% CO 2 +30%O 2 , mainly used to increase the ratio of oxygen, rapid decarburization;
[0021] c. During the proce...
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The invention provides a control method for realizing ultralow iron oxide in converter terminal slag. Namely, a bottom blowing powder spraying system is added on the basis of a traditional converter, and through operation of the bottom blowing powder spraying system, the problem that the slag dephosphorization capacity is reduced due to slag drying in the middle stage of blowing is effectively overcome through a strong bottom blowing system; and the converter utilizes the bottom blowing powder spraying system to blow part of N2, Ar gas or CO2 mixed gas into the converter through a bottom blowing spray gun in the waiting process from carbon catching to steel tapping, a molten pool continues to stir, iron oxide in slag is reduced, the iron oxide content in the slag continues to be reduced in the process from end point carbon catching to steel tapping, iron oxide in end point slag is reduced under a bottom powder spraying technology, the loss of metal iron can be reduced, the iron yield is increased, and steel material consumption of converter steelmaking is reduced.
Description
technical field [0001] The invention belongs to the technical field of mining, smelting and smelting, and relates to a control method for realizing ultra-low iron oxide of slag 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 or carbon dioxide gas to complete the effective stirring of the slag, promote the full release of the steel slag reaction interface, and improve the smelting efficiency. Large, high consumption of steel materials. Contents of the invention [0003] The purpose of the present invention is to address the problems existing in the prior art, to provide a control method for realizing ultra-...
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IPC IPC(8): C21C5/36C21C5/35
CPCC21C5/36C21C5/35Y02P40/40
Inventor 王德勇张英嘉茹作栋韩志国王春江赵志银
Owner GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD