Method for modifying molten steel slag by using double-molten-pool furnace

Abstract

The invention discloses a method for modifying molten steel slag by using a double-molten-pool furnace. The method comprises the following steps that the double-molten-pool furnace is provided: a furnace body of the double-molten-pool furnace comprises two molten pools, the two molten pools are communicated through a furnace body connecting flue on the furnace body, a middle high-temperature flue is arranged between the two molten pools, one end of the middle high-temperature flue is connected with a powder receiving system, and the other end of the middle high-temperature flue is connected with one of the two molten pools through a flue gas guide switching valve; and the two molten pools are alternately used as an oxidation molten pool and a reduction molten pool by switching the flue gas guide switching valve, and comprehensive treatment of steel slag, zinc-containing fly ash and paragenic ore difficult to dissociate is achieved through the oxidation molten pool and the reduction molten pool. According to the method, steel slag can be modified into iron-making reducing slag to serve as a concrete admixture to be widely utilized, alkali metal harmful to smelting in fly ash of a steel mill can be removed, and meanwhile, a melting and dissociation method for paragenetic ore difficult to dissociate in the nature is provided.

Description

technical field [0001] The invention belongs to the field of recycling and comprehensive reuse of solid waste resources in iron and steel plants, and in particular relates to a method for modifying steel slag under oxidation and reduction atmosphere conditions. Background technique [0002] my country is the country with the largest steel production capacity. According to statistics, by 2020, the annual production capacity of crude steel has exceeded 1 billion tons, which means that more than 100-150 million tons of steel slag needs to be disposed of as waste, which does not include 300-400 million tons The above ironmaking waste. [0003] Blast furnace ironmaking waste slag, commonly known as "blast furnace slag". After water quenching treatment to prepare ultrafine powder, it has been widely used as concrete admixture. Steelmaking waste slag contains high iron elements, and the content of TFe (total iron) reaches 20%. At the same time, the slag discharge temperature of m...

AI Technical Summary

Problems solved by technology

However, due to the enrichment of phosphorus in the steel slag when it is reused in the steel plant; and due to factors such as excessive free magnesium and calcium ions, the use of steelmaking waste slag as a concrete admixture is limited.

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