B - Operations – Transporting – 01 – D
Patent
B - Operations, Transporting
01
D
B01D 61/44 (2006.01) B01D 61/50 (2006.01) C22B 3/20 (2006.01) C22B 19/00 (2006.01)
Patent
CA 2041041
METHOD FOR TREATING SOLUTIONS IN HYDROMETALLURGICAL ZINC PROCESSING ABSTRACT Dilute aqueous sulfate solutions encountered in hydrometallurgical treatment of zinc-containing materials are treated for the control of bulk and for the recovery of metal values. The solutions are treated by electrodialysis for the recovery of a solution depleted in zinc, usually containing less than about 1 g/L zinc, and other ions for return to the hydrometallurgical treatment, and for the recovery of a solution concentrated in zinc, usually containing about 70 to 160 g/L zinc, for return to the hydrometallurgical treatment and the recovery of contained values. To control the ion concentrations in the concentrate circulating through the concentrate compartments of the electrodialysis unit, a solution such as water, diluate sulfuric acid, a portion of the feed solution or a portion of the circulating diluate may be added to the circulating concentrate. Electrodialysis is carried out under turbulent conditions at linear flow velocities from about 3 to 7 cm/s, at about 10 to 500 A/m2, preferably at about 100 to 400 A/m2, and at pH values below about 5.2, preferably in the range of about 3 to 5.
Cominco Ltd.
Gowling Lafleur Henderson Llp
LandOfFree
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