Process for electrowinning of massive zinc with hydrogen anodes

Details Process for electrowinning of massive zinc with hydrogen anodes Process for electrowinning of massive zinc with hydrogen anodes

C - Chemistry, Metallurgy

25

C

204/74

C25C 1/16 (2006.01)

Patent

CA 1198081

ABSTRACT A process for electrowinning massive zinc at a temperature between about ambient and about 75°C and at a cathodic ampere efficiency in excess of about 85% in a driven single-compartment cell comprising a zinc cathode electrode and a spaced porous hydrophobic hydrogen anode electrode. The process comprises providing the cell with a common electrolyte contacting both the electrodes, the electrolyte being a purified aqueous solution of zinc sulfate and free sulfuric acid, the solution being doped with an organic additive capable of sustaining the ampere efficiency throughout the electrolysis, adjusting the solution to contain a sufficient concentration of zinc, as zinc sulfate, to enable cathodic deposition of zinc at the ampere efficiency, a content of free sulfuric acid in an amount within a concentration range that enables attainment of the voltage benefit of the anodic hydrogen gas-hydrogen ion reaction without adversely affecting said cathodic ampere efficiency,passing an electrolysis current through the cell, supplying hydrogen gas to the anode in amount sufficient to prevent anodic oxygen evolution during the electrolysis, and maintaining the zinc and free acid con- centrations during the electrolysis between about 50 g/l and about 200 g/l and between about 80 g/l and about 300 g/l, respectively.

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