Abstract
The hydrometallurgical processing of zinc sulphide concentrates with sulphuric acid in the presence of manganese dioxide (manganese ore has been employed) and subsequent electrolytic co-deposition of cathodic zinc metal and anodic manganese dioxide is described. The influence of various parameters on the reaction ZnS + MnO 2 + 2H 2SO 4 = ZnSO 4 + MnSO 4 + S 0 + 2H 2O has been studied. Optimum conditions for rapid and efficient reaction have been determined. The simultaneous electrowinning of zinc at the cathode and γ-MnO 2 at the anode from the leach liquor was studied. The effects of variation of current density, temperature, electrolyte composition etc. have been described in detail. During leaching 99% extraction of zinc, 98% of manganese, and 96% liberation of elemental sulphur was achieved. 80–90% anodic and cathodic current efficiencies can be obtained under optimum conditions with impurity levels of only a trace of manganese in the zinc deposit and vice-versa. The anodically deposited manganese dioxide was the γ-battery active variety and was found to be satisfactory. The results indicate the potential for the development of a technique for zinc and manganese dioxide production in a single cell.
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