Ammonium chloride-ammonium hydroxide strip for the recovery of anhydrous zinc chloride
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United States of America Patent
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Feb 19, 1985
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N/A
app pub date -
Jan 19, 1984
filing date -
Jan 19, 1984
priority date (Note) -
Expired
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Abstract
Anhydrous zinc chloride is produced from an aqueous feed solution containing zinc chloride from an aqueous feed solution containing zinc chloride. The zinc chloride is extracted onto an organic extractant known to the art such as tributyl phosphate, primary, secondary or tertiary amines, and quaternary amine salts. The loaded extractant is then stripped with aqueous stripping solution containing ammonium chloride and ammonium hydroxide. The zinc ammine chloride formed in this aqueous stripping solution is separated from the stripping solution and can then be heated to form anhydrous zinc chloride and ammonia. This anhydrous zinc chloride is suitable as a feed material to a fused salt electrolysis process for the production of zinc.
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