Chemistry: electrical and wave energy – Processes and products – Electrostatic field or electrical discharge
Patent
1976-06-22
1977-06-21
Andrews, R. L.
Chemistry: electrical and wave energy
Processes and products
Electrostatic field or electrical discharge
C25C 112
Patent
active
040309908
ABSTRACT:
Copper sulfate solution obtained by the sulfuric acid leaching of cupriferous material and containing impurities such as Fe, As, Sb, Bi, Se, Te, Sn, Pb, Cl, Ag, Hg, and PO.sub.4, are subjected to a two step purification process. In the first step, the pH is adjusted to 2.7-3.3 with, e.g. Ca(OH).sub.2, and the potential in relation to the standard hydrogen electrode is adjusted to at least 575 mv with an oxidizing agent, e.g. air. The temperature is 50.degree.-90.degree. C. Impurities precipitate and are separated. Se, Cl, and possibly Ag and Hg remain in solution and are removed in the second step, wherein the potential is reduced to below 350 mv by addition of a cupriferous reducing agent, e.g. Cu or Cu.sub.2 O. The pH is below 3 and the temperature is below 50.degree. C. Impurities precipitate as copper (I) compounds, and are separated to provide the solution in condition for the electrolysis. The copper produced is of high purity, having a conductivity of at least 58.8 mho .times. m/mm.sup.2 and a maximum semi-hard temperature of 200.degree. C.
REFERENCES:
patent: 1598296 (1926-08-01), MacKay
Kudelka Herbert
Piret Norbert L.
Rabben Hans Joachim
Schmidt Siegbert
Andrews R. L.
Duisburger Kupferhutte
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