Aqueous electrowinning of metals

Details Aqueous electrowinning of metals Aqueous electrowinning of metals

1980-01-21

1981-07-21

Tufariello, T. M.

Chemistry: electrical and wave energy

Processes and products

Electrostatic field or electrical discharge

204108, 204119, C25C 100, C25C 108, C25C 112, C25C 116

Patent

active

042797110

ABSTRACT:
An improved process for aqueous electrowinning of metals, using methanol (or another soluble fuel) added to the electrolyte, a catalytically active platinum mesh or platinum-plated titanium anode and periodic current reversal, in order to maintain a low anodic potential, and hence, a cell voltage and energy consumption lower than in conventional processes. Examples illustrate the electrowinning of zinc and copper from sulfuric acid-sulfate electrolytes, but the process applies to other metals. Also disclosed is the use of an ion-exchange membrane in combination with the above features, in order to decrease the loss of fuel from the anolyte and to minimize the effect at the anode of impurities present in the catholyte.

REFERENCES:
patent: 598180 (1898-02-01), Hoepfner
patent: 3103474 (1963-09-01), Juda
patent: 3772003 (1973-11-01), Gordy
patent: 4056449 (1977-11-01), De Nora
patent: 4178218 (1979-12-01), Seko
Ind. Chim. Belge Suppl., vol. 1, pp. 777-781, 1959.
ATB Metallurgie, Mons, Belgium, vol. X, No. 4, 1970, pp. 113-124.
J. of Metals, vol. 27, No. 12, p. A53, 1975.
Chemical Abstracts, vol. 87, 1977, 87:42299f.

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