Lithium halide brine purification
AssigneeThe Dow Chemical Company
InventorsJohn M. Lee, William C. Bauman
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Abstract
A resin/aluminate composite which has been substantially loaded with Li.sup.+ values by being contacted with a contaminated, Li.sup.+ -containing aqueous solution, is pre-washed with a substantially pure, concentrated NaCl brine to remove the contaminants without removing the Li.sup.+ values, then is washed with water to leach out much, but not all, of the Li.sup.+ values. The resin/aluminate composite comprises a macroporous anion exchange resin having crystalline LiX.2Al(OH).sub.3 dispersed therein, where X is halide.
Claims13
A method for leaching Li.sup.+ values from a macroporous resin/aluminate composite which contains contaminated brine,
- said resin/aluminate composite comprisng an anion exchange resin having crystalline LiX.2Al(OH).sub.3 dispersed therein, where X is halide, and being substantially loaded with respect to Li.sup.+ values,
- said method comprising a pre-wash of the composite with a substantially pure contaminant free, concentrated alkali metal halide solution to substantially wash the contaminated brine from the composite without significantly removing Li.sup.+ values, and
- water-leaching the substantially pure alkali metal halide solution and a substantial amount of Li.sup.+ values from the composite, leaving the composite substantially unloaded, but not completely unloaded, with respect to Li.sup.+ values.
Dependencies are inferred from the claim text.