Process for electrowinning of copper values from solid forms...

Details Process for electrowinning of copper values from solid forms... Process for electrowinning of copper values from solid forms...

C - Chemistry, Metallurgy

25

C

204/69.5

C25C 1/12 (2006.01)

Patent

CA 1045579

PROCESS FOR ELECTROWINNING OF COPPER VALUES FROM SOLID FORMS THEREOF ABSTRACT A process for electrowinning of copper values from cement copper and/or copper sulfide concentrates in which the copper bearing material is agitated in a cell in the presence of H2SO4 while temperatures are maintained above 60°C, current densities are above 60 amperes per square foot of cathode but below that current density at which electrolyte boils and deposited copper plate becomes brittle. The process is characterized by the fact that a concentration of soluble iron, in the range from 10 to 40 grams/liter, is kept in solution in the electrolyte at all times. The iron ranges from 20-40 gpl in the case of cement copper, and from 10-35 gpl in the case of copper sulfide concentrates. The soluble iron content is maintained high enough to provide a reservoir of ferric ions to aid in oxidizing and/ox leaching of the copper. Current densities must be high enough to effect electrolysis with the reduction of copper and liberation of hydrogen gas in quantity to prevent attack of the cathode by ferric iron.

203902

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