Process for recovery of zinc from sphalerite containing ores or concentrates
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United States of America Patent
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Dec 19, 2000
Grant Date -
N/A
app pub date -
May 13, 1999
filing date -
Mar 7, 1996
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Expired
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Abstract
A process for recovery of zinc from sphalerite containing ores or concentrates, whereby, in a first step, these ores or concentrates are submitted to a thermal treatment consisting essentially of a heating cycle performed under non-oxidizing conditions above 900.degree. C. thereby at least partly transforming the sphalerite to wurtzite, and subsequently the wurtzite is quenched in such conditions as to retain at least partly the wurtzite after quenching. In a second step zinc is leached out of the converted ore or concentrate, and in a third step zinc is recovered from the leaching solution by electrolysis.
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