Process for recovery of cobalt by selective precipitation of cobalt-calcium double salt
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United States of America Patent
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Jul 24, 2001
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N/A
app pub date -
Apr 11, 2000
filing date -
Apr 11, 2000
priority date (Note) -
Expired
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Abstract
There is provided a process for the recovery of cobalt as cobalt (III) hexammine sulphate, comprising adding an effective amount of a calcium sulphate slurry to an ammoniacal ammonium sulphate solution containing cobalt (III) hexammine sulphate to thereby selectively precipitate a cobalt (III) hexammine sulphate-calcium sulphate double salt. The solution containing other base metal impurities is separated from the cobalt (III) hexammine sulphate-calcium sulphate double salt precipitate. An effective amount of an ammonium carbonate containing solution is added to the double salt precipitate to thereby redissolve cobalt (III) hexammine sulphate and precipitate calcium carbonate.
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