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(11)    Patent No :    AP 1973    (73) Applicant(s)       
(21)    Application No :    AP/P/2005/003447    BHP BILLITON SA LIMITED, 200 Hans Strijdom Drive,       
            Randburg, 2194,       
                   
(22)    Filing Date :    15.05.2004    South Africa       
(24)    Date of Grant &    12.03.2009           
                   
(45)    Publication :

(30)    Priority Data            (72) Inventors   
    (33) Country    (31) Number    (32) Date    BOWKER Clint, South Africa   
    ZA    2003/3621    19.05.2003    (74) Representative   
(84)    Designated State           
                   
    ZM            HONEY & BLANCKENBERG   
                   
(51)    International    Classification    C22B3/18 (2006.01)    C22B15/00 (2006.01)   


(54)    Title

Treatment of base metal concentrate by a two-step bioleaching process

(57)    Abstract

A method of recovering at least one base metal from a concentrate wherein a residue of a primary bioleach of the concentrate, under mesophilic and moderate themophilic conditions, is processed to recover at least one metal, and the base metal is recovered from a solution, produced by a secondary bioleach under thermophilic conditions, of a residue of the metal recovery process.


(56)    Documents Cited :    EP 1 050 593 A    US 6 383 255 B1    WO 00/23629 A

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