Tellurium extraction from copper electrorefining slimes
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United States of America Patent
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Aug 17, 1999
Grant Date -
N/A
app pub date -
Jul 27, 1998
filing date -
Jul 27, 1998
priority date (Note) -
Expired
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Abstract
The present invention is concerned with a method for the substantially selective extraction of tellurium from copper electrorefining slimes. The method comprises maintaining a molar ratio Ag/Se, Ag/S or Ag/Se+S at a value of about 2 or less in the slimes during leaching thereof in an autoclave. The excess of selenium and/or sulphur allows the formation of Ag.sub.2 Se or Ag.sub.2 S, which remains insoluble during autoclave leaching.
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