PROCESS FOR RECOVERING ELECTROLYTIC COPPER OF HIGH PURITY BY MEANS OF REDUCTION ELECTROLYSIS

摘要

Electrolytic copper of high purity is obtained by reduction electrolysis of copper sulphate solution obtained in the sulphuric leaching of conventional cupriferous materials and containing disturbing impurities. Prior to the electrolysis, the copper sulphate solution is subjected to a two-step leach purification. In the first step the pH is maintained at 2.7 to 3.3 and the potential at least 575 mv in relation to a standard hydrogen electrode and compounds insoluble under these conditions are removed by solidliquid separation. In the second step, a reducing agent is added and the potential is decreased to precipitate copper (I) compounds which are subsequently removed by fine filtration.