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(11)    Patent No :    AP 1929    (73) Applicant(s)       
(21)    Application No :    AP/P/2005/003433    LONMIN PLC, 4 Grosvenor Place, London SW1X 7YL,       
            United Kingdom       
                   
(22)    Filing Date :    08.04.2004           
(24)    Date of Grant &    12.12.2008           
                   
(45)    Publication :

(30)    Priority Data            (72) Inventors   
    (33) Country    (31) Number    (32) Date    BAX Alan, Australia   
    AU    PCT/AU03/0043    11.04.2003           
        5               
    ZA    2003/5682    23.07.2003    (74) Representative   
(84)    Designated State           
                   
    BW  GM  GH    KE   LS   MW    MZ   SL   SD    FISHER CORMACK & BOTHA   
    SZ   T Z   UG   ZM   ZW               
(51)    International    Classification    C22B 3/44 (2006.01)    C22B 11/08 (2006.01)   
            C22B 3/00 (2006.01)       


(54)    Title

Recovery of platinum group metals

(57)    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 recove red 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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