Metal recovery process

Details Metal recovery process Metal recovery process

C - Chemistry, Metallurgy

22

B

53/20, 53/329

C22B 3/44 (2006.01) C02F 9/00 (2006.01) C22B 7/00 (2006.01) C22B 19/00 (2006.01) C25D 7/06 (2006.01) C25D 21/20 (2006.01)

Patent

CA 1288952

ABSTRACT A method is disclosed for the elimination of hazar- dous metal wastewater and sludges by recovering the non- ferrous metals zinc, nickel, copper (II), cadmium or chromium (III) present in an aqueous sludge comprising mixed metal hydroxides by selectively precipitating the ferrous metal ions present while maintaining the non-ferrous metal ions in solution, isolating the precipitate and then precipitating the non-ferrous metal ions from solution.

529910

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