Selective recovery of zinc from metal containing brines
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United States of America Patent
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-
Nov 25, 1986
Grant Date -
N/A
app pub date -
Oct 2, 1985
filing date -
Oct 2, 1985
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Zinc is extracted from an aqueous zinc containing brine (3) by contacting the brine with an organic reagent (5) consisting essentially of an extracting agent comprising a quaternary amine salt, a phase modifier, and an organic diluent so as to form a zinc amine complex (7) whereby a substantial portion of the zinc ions in the brine is transferred to the organic phase. The quaternary amine salt is a methyl triakyl ammonium chloride herein the alkyl groups contain from 8 to 10 carbon atoms. The zinc amine complex (7) is then contacted with an aqueous strippant (11) comprising a solution of sodium sulfate in water so as to form a sulfated quaternary amine salt whereby a substantial portion of zinc in the zinc amine complex is stripped therefrom and transferred to the aqueous phase as an aqueous zinc chloride solution (13) from which zinc may be recovered by electrowinning or chemical precipitation.
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