Method for improving metallization ratio in smelting reduction process of steel solid waste

Abstract

The invention relates to a method for improving the metallization ratio in the smelting reduction process of steel solid waste. The method comprises the following steps: firstly, pouring steel slag powder, oxide scale and steelmaking fly ash into a mixer, adding water, and performing stirring and mixing to obtain a mixed solution; adding a steel slag reduction activator into the mixed solution for reaction to obtain liquid steel slag; feeding the liquid steel slag into a smelting furnace for reaction, and adding a modifier into the smelting furnace in the reaction process; after a period of reaction, molten iron and steel slag can be obtained in the smelting furnace, tilting the smelting furnace, and pouring the molten iron into a steel ladle; and conveying the steel ladle containing the molten iron to a molten iron treatment station to be subjected to molten iron treatment, and cooling the treated molten iron to obtain the needed reduced iron metal. The method has the advantages that the steel slag, dust and the like generated by steelmaking are used as raw materials to extract metal iron, and meanwhile, the steel slag reduction activating agent and the modifier are matched, so that the capacity of reduced iron is improved by about 10%.

Description

technical field [0001] The invention relates to the field of iron and steel solid waste treatment, in particular to a method for increasing the metallization rate in the smelting reduction process of iron and steel solid waste. Background technique [0002] The iron and steel industry is a typical resource- and energy-intensive industry. Iron and steel production needs to consume a large amount of resources such as iron ore, coal, and fresh water, and produce a large amount of "three wastes" resources. According to statistics, long-process iron and steel enterprises consume about 0.7 to 0.8 tons of coal, 1.5 to 1.55 tons of iron ore, and a large amount of raw materials such as limestone flux to produce 1 ton of crude steel, and the solid waste generated per ton of steel is about 600 kg. According to different generation interfaces, solid waste mainly includes blast furnace slag, steel slag, iron-containing dust, environmental dust, waste refractories, self-provided power pla...

AI Technical Summary

Problems solved by technology

At present, the steel slag in the hot state is hot and stuffy, and the steel slag crushing, rod milling, and magnetic separation processes in the cold state are long. The recovery rate of metallic iron is only 8%, and the iron element in the oxidized state cannot be recovered, resulting in huge waste.