Method for selectively recovering lead from complex...

Details Method for selectively recovering lead from complex... Method for selectively recovering lead from complex...

C - Chemistry, Metallurgy

25

C

204/163, 204/73

C25C 1/18 (2006.01) C25C 1/00 (2006.01) C25C 5/02 (2006.01) C25C 7/00 (2006.01)

Patent

CA 1300554

ABSTRACT The invention relates to a method for selectively recovering lead from complex sulphidic non-ferrous metal concentrates in an electrolytic cell incorporating at least one anode and one cathode and an electrolyte containing chlorine ions, at a temperature beneath the boiling point of the concentrate-containing elec- trolyte and at a pH beneath 7. Sulphur present in the concentrate is converted substantially into elementary form, and at least the major part of the lead con-tent passes into solution and is then precipitated selectively by cathodic pro- cesses. The invention is characterized in that the concentrate is slurried in anelectrolyte having a chloride-ion strength above about 2 M, preferably in the range 3-5 M, to form a suspension which is caused to flow into contact with or adjacent the surface of anodes located in the cell; and in that the highest possible anodic current density considering required selectivity is maintained during the electro-winning process.

516135

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