C - Chemistry – Metallurgy – 25 – C
Patent
C - Chemistry, Metallurgy
25
C
53/315, 204/74
C25C 1/16 (2006.01) C01G 28/02 (2006.01) C22B 3/46 (2006.01) C22B 30/04 (2006.01)
Patent
CA 1146906
ABSTRACT OF THE DISCLOSURE The invention described herein relates to metallurgical processes for the recovery of zinc arsenate from cement copper cake residues, and the use thereof in the purification of impure zinc electrolyte. Impure zinc electrolyte containing copper, cobalt and cadmium impurities is treated in a purifica- tion step by addition of zinc dust and arsenic for the precipitation of cement copper cake precipitate. The copper cake precipitate is subjected to an acid leach to provide an acid leach residue and the acid leach residue is subjected to a caustic leach to provide a copper enriched residue and an arsenic containing filtrate which is treated with zinc to provide a residue containing zinc arsenate. All or a portion of the arsenic added in the zinc electrolyte purification step can be supplied by the addition of the zinc arsenate contained in the residue from the caustic leach with the zinc dust.
342258
Kangas Kayo
Mouland John E.
Timler Stanley
Gowling Lafleur Henderson Llp
Texasgulf Inc.
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