Resource recycling method and system for steelmaking tailings

Abstract

The invention discloses a resource recycling method and system for steelmaking tailings. Through reasonable design, a jaw crusher, an impact crusher and a vibrating screen can be used for producing tailings with the grain diameters being of three specifications. The tailings with the grain diameters being 10mm-15mm and the tailings with the grain diameters being 4.75mm-10mm can be used as coarse aggregate in a concrete mixture. The tailings with the grain diameters being 0-4.75mm can be used as fine aggregate in the concrete mixture. The tailings with the three types of grain diameters can be further mixed into cement clinker. Steel slag fine powder is obtained through magnetic-separation with a dry separator to be returned to an iron and steel smelting system for secondary smelting and recovery of the metal iron. Grain steel is produced through a de-ironing separator, and further, products with higher economic value are produced through resource recycling of the tailings. According to the resource recycling method and system for the steelmaking tailings, waste is turned into wealth, and both the problem of environment pollution and the problem of resource waste are solved.

Description

technical field [0001] The invention relates to the technical field of secondary resource recovery, in particular to a method and system for resource recovery and utilization of steelmaking tailings. Background technique [0002] Steel slag is the slag discharged from steelmaking, which is divided into converter slag, open hearth furnace slag and electric furnace slag according to the furnace type; the discharge is about 15% to 20% of the crude steel output; it is mainly composed of calcium, iron, silicon, magnesium and a small amount of aluminum and manganese , phosphorus and other oxides; the main mineral phases are tricalcium silicate, dicalcium silicate, calcium magnesium olivine, calcium magnesium rhodoxene, calcium aluminate ferrite, and oxides of silicon, magnesium, iron, manganese, and phosphorus The solid solution formed by the material also contains a small amount of free calcium oxide, metallic iron, fluoroapatite, etc. In some areas, because the ore contains tit...

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Problems solved by technology

[0003] At present, most iron and steel enterprises will use the beneficiation process to recover part of the iron in steel slag, and produce two products: slag-rich iron ore and tailings. Among them, the slag-rich iron ore returns to the smelting system to continue to recover the metallic iron in it, and the remaining tailings There is no economical and reasonable way to deal with slag, and most of them are piled up at present, which not only pollutes the environment, but also wastes resources

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