B - Operations – Transporting – 01 – D
Patent
B - Operations, Transporting
01
D
204/98.03
B01D 61/42 (2006.01) B01D 71/28 (2006.01) C25C 1/22 (2006.01)
Patent
CA 1272982
ABSTRACT Lithium-containing brines containing mono and multivalent cations, especially magnesium, and anions are treated by electrodialysis to effect separation of a lithium concentrate low in multivalent cations from which lithium can be recovered as chloride, sulfate, or carbonate. Brine containing 0.03 to 15 g/L Li and a ratio of Mg:Li as high as 60:1 is subjected to one or more electrodialysis steps. The preferred cationic and anionic membranes are those that are strongly acidic and have sulphonic acid radical and trimethylamine derivatives, respectively, as active groups at 3 to 4 milligram equivalent per gram of dry resin and have a matrix of styrene divinyl benzene copolymer on a pvc base. Electrodialysis is carried out at a pH below 7 under turbulent conditions. The number of electrodialysis steps depends on the permselectivity of the membrances, the Mg:Li ratio in the feed and that in the concentrate, the latter being maintained at 5:1 or less. The chloride concentration in the electrode compoartments is maintained at less that 3 g/L. In multi-step electrodialysis, a portion of the magnesium may be removed in an intermediate stage by the addition of lime, the lithium in the resulting solution being further concentrated by electrodialysis. Electrodialysis is carried out in at least one unit comprising a multiplicity of alternating anion permselective membranes and univalent cation permselective membranes defining alternating diluate and concentrate cells between an anode and a cathode compartment. Lithium is recovered from withdrawn concentrate.
495301
Ball Donald Lorne
Boateng Daniel A. D.
Ball Donald Lorne
Boateng Daniel A. D.
Gowling Lafleur Henderson Llp
Teck Cominco Metals Ltd.
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