Extraction of metals from sulphide minerals
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United States of America Patent
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Aug 28, 2012
Grant Date -
Jan 21, 2010
app pub date -
Sep 13, 2007
filing date -
Sep 13, 2006
priority date (Note) -
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Abstract
Nickel entrained in the sulphide mineral pyrrhotite is engineered to dissolve in leaching acid in a two step procedure. First, a slurry of the mineral and the acid is activated by oxidation. This is done in a time T1 by electrolysis; or alternatively chemically, by adding e.g an oxidizing acid to the mineral. After activation, the slurry is then kept under anoxic conditions for a time T2. During T2, the sulphide starts to dissolve much more rapidly, and the rapid breakdown of the sulphide enables the nickel to dissolve and thus to be leached out of the mineral. The dissolved nickel is extracted from the leaching acid e.g by electro-winning.
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