Method for the recovery of lithium from solutions by electrodial

Details Method for the recovery of lithium from solutions by electrodial Method for the recovery of lithium from solutions by electrodial

1985-11-19

1987-01-13

Demers, Arthur P.

Chemistry: electrical and wave energy

Processes and products

Electrostatic field or electrical discharge

2041825, C25B 116, C25B 900, B01D 1300

Patent

active

046362959

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 membranes, 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 compartments is maintained at less than 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.

REFERENCES:
patent: 3014855 (1961-12-01), Kressman
patent: 3149061 (1964-09-01), Parsi
patent: 3291713 (1966-12-01), Parsl
patent: 3752749 (1973-08-01), Chlanda et al.
patent: 3964985 (1976-06-01), Giuffrida
patent: 4111780 (1978-09-01), Murayama et al.
patent: 4141825 (1979-02-01), Conger
Kaplan et al, Chemical Abstracts 60 (1963) #6507b.

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