METHOD OF SEPARATING AND RECOVERING IRON FROM WASTE NON-FERROUS SLAG DISCHARGED FROM PROCESS FOR SMELTING OF NON-FERROUS METALS, INCLUDING COPPER, ZINC AND LEAD BY PHYSICAL AND CHEMICAL SEPARATION TECHNIQUE

摘要

The present invention provides a method of separating and recovering iron from a waste non-ferrous slag, generated in a process for smelting of non-ferrous metals, including copper, zinc and lead, in which a reducing agent and a reaction catalyst are added to the crushed waste non-ferrous slag, and the mixture is subjected to a reduction reaction, thereby converting amorphous iron oxides, bound to alumina, calcium oxide, magnesium oxide, silica, and the like in the waste non-ferrous slag, to crystalline iron (Fe) and iron carbide (Fe2C); the resulting material is crushed to separate iron and iron carbide obtained by the reduction reaction from components such as alumina, calcium oxide, magnesium oxide, silica, and the like; the crushed material is separated into fractions by particle size; and the fractions are subjected to wet magnetic separation and dry magnetic separation to separate and recover magnetic iron concentrates from the fractions.

主权项

1. A method of separating and recovering iron from a waste non-ferrous slag, discharged from a process for smelting of non-ferrous metals, including copper, zinc and lead, by physical and chemical separation, the method comprising the steps of:
(a) crushing the waste non-ferrous slag; (b) mixing the waste non-ferrous slag, crushed in step (a), with carbon as a reducing agent and calcium carbonate (CaCO3) as a reaction catalyst, and subjecting the mixture to a reduction reaction, thereby converting amorphous iron oxides, bound to alumina (Al2O3), calcium oxide (CaO), magnesium oxide (MgO), silica (SiO2), zinc oxide (ZnO), copper oxide (CuO) and lead oxide (PbO) in the waste non-ferrous slag, to crystalline iron (Fe) and iron carbide (Fe2C); (c) crushing the material resulting from step (b) to separate iron (Fe) and iron carbide (Fe2C) obtained in step (b) from components such as alumina (Al2O3), calcium oxide (CaO), magnesium oxide (MgO), silica (SiO2), zinc oxide (ZnO), copper oxide (CuO) and lead oxide (PbO); (d) separating the crushed material, obtained in step (c), into fractions according to particle size; and (e) subjecting the fractions, obtained in step (d), to wet magnetic separation and dry magnetic separation, to separate magnetic iron concentrates from the fractions, and mixing the magnetic iron concentrates with each other.