Electroextraction of zinc from sulphate electrolytes containing antimony ions and hydroxyethylated-butyne-2-diol-1,4: Part 3. The influence of manganese ions and a divided cell

By means of cyclic voltammetry, the influence of manganese ions on zinc electroextraction from pure sulphate electrolyte and electrolytes, containing antimony ions and hydroxyethylated-butyne-2-diol-1,4 (EAA), has been studied. It was established that manganese ions (5 g L−1) have a negligible effect on the zinc deposition from a pure electrolyte. The separation of electrode compartments by a cation exchange membrane leads to an increase of the amount of deposited zinc. This is due to the prevention of the diffusion to the cathode of MnO4− ions and other oxidized products, which decrease the amount of deposited zinc and enhance the deleterious influence of antimony ions. It was proved that the organic additive EAA inhibits the process of zinc redissolution taking place in the presence of antimony ions and the inhibition is stronger when the electrode compartments are separated with a diaphragm.