Processes for recovering metals from ores using organic solvent extraction and aqueous stripping at selected temperature differentials
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United States of America Patent
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Issued Date -
Jun 8, 2006
app pub date -
Nov 2, 2005
filing date -
Dec 3, 2004
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Abandoned
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Abstract
The disclosed invention concerns a process comprising: (a) providing a pregnant leach solution comprising copper values; (b) contacting the pregnant leach solution with an organic phase comprising a copper extractant at an extraction temperature, T.sub.ext, to form a loaded organic phase comprising the metal values; (c) contacting the loaded organic phase with an aqueous stripping solution at a stripping temperature, T.sub.strip, to form a copper-enriched stripping solution; wherein the difference in temperature (.DELTA.T) between the stripping temperature and the extraction temperature according to equation (I): .DELTA.T=T.sub.strip-T.sub.ext is less than or equal to about 10.degree. C. In other increasingly more preferred embodiments of the invention, the difference in temperature (.DELTA.T) is less than or equal to about 5.degree. C., less than or equal to about 2.5.degree. C., less than or equal to about 0.degree. C., less than or equal to about -5.degree. C., and less than or equal to about -10.degree. C. Also disclosed are economic means to manipulate the extraction, strip, and electrowinning temperatures to achieve these temperature differentials.
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