Consecutive or simultaneous leaching of nickel and cobalt containing ores
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United States of America Patent
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Jan 18, 2011
Grant Date -
Feb 28, 2008
app pub date -
May 8, 2007
filing date -
Nov 17, 2004
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A process for the recovery of nickel and cobalt from nickel and cobalt containing ores, including the steps of first leaching a laterite ore and/or a partially oxidized sulfide ore with an acid solution to produce a pregnant leach solution containing at least dissolved nickel, cobalt and ferric ions, and subsequently leaching a sulfide ore or concentrate with the pregnant leach solution to produce a product liquor. Alternatively, the laterite ore and/or partially oxidized sulfide ore can be leached in a combined leach with the sulfide ore or concentrate. The ferric ion content in the pregnant leach solution or in the combined leach is sufficient to maintain the oxidation and reduction potential in the sulfide leach high enough to assist in leaching nickel from the sulfide ore or concentrate.
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