Recovery of Copper, Cobalt, Nickel, Cadmium, Zinc and Bismuth from Electrolytic Copper Solution


Abstract: An electrolytic Copper Solution (ECS) was electrolyzed using platinum electrodes. Copper was obtained in solid form. In order to precipitate Cd(II), Bi(III), As(III), Sb(III) and the rest of the Cu(II) ions, H_2S gas was passed through the remaining solution. The remaining solution was evaporated to obtain metal sulphates. The sample containing metal sulphates was roasted at temperatures between 550 and 800°C. Cobalt, nickel and zinc in the solid sample remained in the form of metal sulphates, while the iron in the sample was converted into Fe_2O_3. This solid sample was dissolved in water and filtered in order to crystallize the NiSO_4. As a result of crystallization, a maximum yield of 86.2% was obtained. The solid containing metal sulphides (CuS, CdS, Bi_2S_3 and Sb_2S_3) was roasted at 600°C for 3 hours. The roasted sample was dissolved in water and filtered. It was determined that the conversion of CuS into CuSO_4 occurred, together with the conversion of CdS and Bi_2S_3 into CdO and Bi_2O_3. The samples containing CdO and Bi_2O_3 were then leached with 0.5 M H_2SO_4 solution at 50°C for one hour. The extraction yield was 97%.


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