Specialized metallurgical processes – compositions for use therei – Processes – Free metal or alloy reductant contains magnesium
Reexamination Certificate
2004-04-08
2009-06-09
King, Roy (Department: 1793)
Specialized metallurgical processes, compositions for use therei
Processes
Free metal or alloy reductant contains magnesium
Reexamination Certificate
active
07544231
ABSTRACT:
A process of recovering platinum group metals (PGMs) from a pregnant solution or leachate containing PGM values and base metals, typically a cyanide solution or leachate. A non-selective precipitation of the PGM values and base metals to form an insoluble precipitate comprising the PGM values and base metals is followed by selective leaching of the precipitate. The selective leaching forms a leach solution containing the base metals and a residue containing the PGM values, or a leach solution containing the base metals and PGM values and a depleted residue. The base metals are recovered from the leach solution and the PGM values are recovered from the residue or the leach solution, depending on the selective leaching. The non-selective precipitation of the PGM values and base metals is carried out by controlled reduction of the pH of the pregnant solution or leachate to a pH of about 2.
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patent: 2002/0152845 (2002-10-01), Fleming et al.
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patent: WO 03/087416 (2003-10-01), None
Flett, Douglas, “Solution Purification” Hydrometallurgy, Jun. 1, 1992, pp. 327-344, vol. 30, Nos. 1/3, Amsterdam, NL.
Bax Alan
Dunn Grenvil Marquis
Lewins John Derek
King Roy
Lonmin PLC
McCarter & English LLP
McGuthry-Banks Tim M
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