Oxidative Leaching and Electrowinning of Copper With Fluosilicic Acid.
Beyke-CJ; Wethington-AM; Lee-AY
Paper in Hydrometallurgy and Electrometallurgy of Copper--vol III Pergamon PP 19-34 :19-34
The U.S. Bureau of Mines has developed a method for the recovery of copper from copper sulfide concentrates using fluosilicic acid (h2sif6) for leaching and electrowinning. Chalcopyrite (cufes2) was pretreated by high-temperature sulfidation with elemental sulfur (s deg). Sulfidation partitioned the cufes2 particles into covellite (cus) rims over pyrite (fes2) cores. Both atmospheric and pressure leaching of the sulfidized concentrate were highly selective for copper. Copper extraction was 90 to 95 pct while iron extraction was 5 to 15 pct. Good copper deposits were electrowon from purified cusif2 solutions. Current efficiencies were 95 pct with energy consumptions of 2.0 Kw.H/kg copper.
Paper in Hydrometallurgy and Electrometallurgy of Copper--vol. III Pergamon, PP. 19-34