Reductive ammoniacal leaching of nickel and cobalt bearing materials
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United States of America Patent
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Oct 13, 2009
Grant Date -
Jul 19, 2007
app pub date -
Apr 8, 2004
filing date -
Apr 11, 2003
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Abstract
A process for the recovery of nickel and/or cobalt from an impure nickel, cobalt or mixed nickel/cobalt material including the steps of: a) providing a nickel, cobalt or mixed nickel/cobalt material; and b) contacting the nickel, cobalt or mixed nickel/cobalt material with a feed ammoniacal ammonium carbonate solution and a reductant in a leach step.
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