A converter slag-less smelting method

Abstract

The invention relates to the field of smelting, in particular to a converter slag-less smelting method. During smelting, the double slag operation is combined with slag retention. The process flow is: slag splashing to protect the furnace → slag solidification → confirmation of slag solidification → adding scrap steel → adding iron → slag making in converter smelting → releasing dephosphorization slag in the early stage → blowing the gun again Smelting decarburization → tapping and slag retention; taking advantage of the low temperature in the early stage, which is beneficial to the thermodynamic conditions of dephosphorization reaction, the final slag from the upper furnace is used in the initial stage of blowing in the lower furnace for dephosphorization, and when the temperature rises to a temperature that is unfavorable for dephosphorization Before, part of the slag was poured out, and then slag was added to make slag, and the second stage of blowing was carried out to further dephosphorize; the high-efficiency dephosphorization technology of the converter with low gun position and large oxygen supply was adopted, and the slag was poured out in sufficient amount after dephosphorization. The invention achieves obvious effects through the application of "double slag-retaining slag" and "retaining slag" technology, the ash consumption of the converter is greatly reduced, and the amount of slag is reduced to some extent.

Description

technical field [0001] The invention relates to the field of smelting, in particular to a converter slag-less smelting method. Background technique [0002] The iron and steel industry is in a strategic position in the country and plays an irreplaceable role in the national economy, people's lives, and national security. The rapid development of the iron and steel industry has promoted my country's economic construction, made a huge contribution to the national economy, and supported energy, transportation, and construction. , electric power, chemical industry, materials and other important industries. [0003] At present, more than 90% of domestic iron and steel enterprises use converter steelmaking. Each ton of steel produced consumes about 40-60kg of lime, 12-30kg of light-fired or raw-fired dolomite, and produces 90-120kg of slag. After treatment by rollers, water quenching and other processes, it is mainly used as roadbed stone for furnace inversion, and its economic va...

AI Technical Summary

Problems solved by technology

[0003] At present, more than 90% of domestic iron and steel enterprises use converter steelmaking. Each ton of steel produced consumes about 40-60kg of lime, 12-30kg of light-fired or raw-fired dolomite, and produces 90-120kg of slag. After treatment by rollers, water quenching, etc., it is mainly used as roadbed stone for furnace inversion, and its economic value is very low.

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