Pretreatment technology of terminal steel slag in converter

Abstract

The invention discloses a pretreatment technology of terminal steel slag in a converter, which mainly comprises the steps of: adding a fluxing agent or the fluxing agent and a reducing agent into the converter from an overhead bunker before the converter blowing terminal to carry out pretreatment on the terminal steel slag. The steel slag is diluted by adding the fluxing agent in the stick steel slag near the terminal; and after adding the fluxing agent and the reducing agent in the diluted steel slag, the content of FeO in the steel slag is decreased by moderate reduction in the premise of keeping the favorable liquidity of the slag. By adopting the technology disclosed by the invention, the content of MFe in the slag can be reduced substantially or the content of FeO in the slag can be reduced moderately, thereby increasing the yield of the molten steel, and providing precondition for increasing the processing ratio in the follow-up process of wind quenching and other granulation processes of the steel slag and deep reduction of FeO in the slag and improving the converter protection effect of slag splashing.

Description

Technical field [0001] The invention relates to the field of steel slag processing, and in particular to a final steel slag pretreatment process for converter blowing. Background technique [0002] In order to reduce the erosion of the terminal slag on the furnace lining and facilitate the slag blocking and slag splash protection operations, the steelmaking process requires the terminal slag to be glued. Before 1994, the converter slagging and furnace protection process required the final slag to be glued and hanged. "The converter slag splashing protection operation implemented after 1994 required that the end slag be "transparent and sticky", and the end slag became more and more viscous. The converter age increased from the initial more than 440 furnaces to more than 4000 furnaces, and reached At present, there are more than 30,000 furnaces, and the furnace age has undergone a revolutionary change. However, the metal iron (MFe) taken away in the slag has also increased from 5...

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