A kind of recovery method of metallic iron in weak magnetic iron and magnetic iron mixed steel slag

Abstract

The invention discloses a recycling method of metallic iron in mixed steel slag of weakly magnetic iron and magnetic iron. The recycling method comprises the following steps of adopting two-stage crushing, carrying out rough grinding with a rod mill so as to avoid over crushing of materials and ensure that chunk metallic steel slag is effectively ground, and carrying out stage classification to obtain a chunk steel slag metallic iron finished product; sieving slurry, and carrying out separation to obtain a qualified metallic iron finished product with a washbox; discarding large amounts of tailings subjected to the washbox through the technological procedures of magnetic separation, fine grinding and secondary magnetic separation so as to improve the grade of the material iron product, and carrying out reselecting to obtain an iron ore concentrate finished product with a spiral chute; and recycling the generated tailings. According to the processing method, steel slag metallic iron products of different stages are obtained through fully using the characteristics that the materials are different in particle size, specific gravity, magnetism, and the like; the method is simple in technology, easy to operate, low in cost, high in metal recovery rate and friendly to production environment; chemical substances are avoided in the whole production technology, and no harmful impurity is generated; and the processing method is suitable for large scale industrial production and wide in application prospect.

Description

technical field [0001] The invention relates to the application field of ore dressing technology, in particular to a method for recovering metallic iron in weakly magnetic iron and magnetic iron mixed steel slag by using the combined technology of magnetic separation and gravity separation. Background technique [0002] The iron and steel industry is a pillar industry of the national economy. A large amount of solid waste (steel slag) is produced in the steelmaking and ironmaking industry. Steel slag is mainly composed of calcium, iron, silicon, magnesium and a small amount of oxides of aluminum, manganese, phosphorus, etc. The main mineral phase is a solid solution formed by tricalcium silicate, dicalcium silicate, etc., and oxides of silicon, magnesium, iron, manganese, and phosphorus, and also contains a small amount of free calcium oxide and metallic iron. The direct stacking of steel slag occupies a large amount of land, causing serious environmental pollution and other...

AI Technical Summary

Problems solved by technology

[0004] The traditional process is not perfect, so a more high-quality and efficient process is needed to process steel slag, improve the recovery rate of metallic iron, reduce weak magnetic impurities such as iron in the tailings, and improve the practical value of steel slag tailings

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