B - Operations – Transporting – 01 – D
Patent
B - Operations, Transporting
01
D
204/98.03
B01D 61/44 (2006.01) B01D 61/46 (2006.01)
Patent
CA 2033545
METHOD FOR REMOVAL OF MONOVALENT IONS FROM METAL SULFATE SOLUTIONS BY ELECTRODIALYSIS ABSTRACT Monovalent ions of chlorine, bromine, fluorine, sodium, potassium and thallium, are efficiently removed from metal sulfate-containing solutions by electrodialysis using alternating monovalent anion permselective membranes and cation exchange membranes or monovalent cation permselective membranes. Both monovalent anions and cations are removed, or only monovalent anions are selectively removed from the metal sulfate solutions. Monovalent anions may be substantially completely removed in a staged process. The method is also useful for the removal of monovalent anions from sodium and potassium sulfate solutions. The sulfate solutions may contain at least one metal other than zinc preferably chosen from Cu, Co, Ni, Mn, Fe, Mg, Cd, Na and K, and which may be present in a dominant amount. Electrodialysis is carried out in one or more stages under turbulent flow conditions, at up to 60°C, a differential membrane pressure of less than 150 kPa, a current density of about 10 to 500 A/m2, preferably 50 to 300 A/m2, and a pH in ranges between values from about 1 to about 9, depending on the metal in the feed. Deposition of metals on the electrodes is minimized. Multi-stage electrodialysis enables the attainment of very low monovalent ion concentrations and the minimizing of metal losses.
Ball Donald Lorne
Boateng Daniel A. D.
Cominco Ltd.
Gowling Lafleur Henderson Llp
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