Converter less-slag smelting method

Abstract

The invention relates to the field of smelting, in particular to a converter less-slag smelting method. During smelting, double slag and remaining slag operation are combined, the technological process comprises the steps of slag splashing for protection of a converter, converter slag solidification, converter slag solidification confirmation, scrap steel adding, iron adding, converter smelting slagging, dephosphorization slag putting in the early stage, gun lowering for blowing and decarburization again, steel tapping and slag remaining; the thermodynamic condition that the early-stage temperature is low and is beneficial to the dephosphorization reaction is utilized, the upper converter final slag is used in the initial stage of lower converter blowing, dephosphorization is carried out,before the temperature rises to be adverse to dephosphorization, part of the converter slag is poured out, then slag charge is added for slagging, second-stage blowing is carried out, dephosphorization is further carried out; and a low-lance-position and large-oxygen-supply converter efficient dephosphorization technology is adopted, and sufficient deslagging is carried out after dephosphorizationis finished. According to the converter less-slag smelting method, through the application of the double slag-remaining slag and remaining slag processes, an obvious effect is obtained, the ash consumption of the converter is greatly reduced, and the slag amount is reduced.

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-fi

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