Dichromate leach of copper anode slimes

Details Dichromate leach of copper anode slimes Dichromate leach of copper anode slimes

C - Chemistry, Metallurgy

25

C

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C25C 1/00 (2006.01) C01B 19/00 (2006.01) C01B 19/02 (2006.01) C22B 15/00 (2006.01) C25C 1/12 (2006.01)

Patent

CA 1094011

ABSTRACT OF THE DISCLOSURE This invention relates to a process for the recovery of metal values from copper refinery anode slimes composed largely of copper, selenium, insolubles, and precious metals including silver, comprising leaching the slimes with a solution containing from 20 to 200 g/l H2SO4 and from 2 to 25 g/l hexa- valent chromium at a temperature not exceeding about 80°C., whereby copper dissolution is maximized and selenium and silver dissolution are minimized, separating the leach solution from the undissolved slimes residue, precipitating selenium from the separated leach solution by treatment with metallic copper, and electrowinning copper from the resulting purified solution.

281219

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