Research on the Process of Sulphatizing Roasting of Copper Slag Flotation Tailings Using Iron Sulphates

Abstract

The paper presents a study of sulphatizing roasting using iron (II) and (III) sulphates of copper slag flotation tailings of JSC “SUMZ” (Sredneuralsk Copper Smelter) with high content of silica. Temperature ranges of sulphatizing roasting and necessary amounts of Fe2(SO4)3 and FeSO4 for sulphation of zinc and copper were calculated by thermodynamic software HSC Chemistry 9.9. The laboratory experiments have shown that the degree of extraction of zinc and copper from the roasted samples during water leaching is in the range of 60-79%, while the degree of dissolution of iron is less than 1.1%. The obtained results are better or comparable to the results of direct leaching of copper tailings by strong sulfuric acid.

Comprehensive Study on the Mechanism of Sulfating Roasting of Zinc Plant Residue with Iron Sulfates

“…The main advantages are relatively low roasting temperature range, lack of fuel consumption due to exothermic sulfating reactions [ 41 ], the application of water leaching rather than acid leaching after the roasting to extract zinc and other valuable components. Some authors have studied iron sulfates as sulfating agents for roasting of zinc ferrite residues [ 42 , 43 ], copper slag [ 44 , 45 ], copper tailings [ 46 , 47 ] and electric arc furnace dust from steelmaking [ 48 ].…”