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(11)    Patent No :    AP 2272    (73) Applicant(s)       
(21)    Application No :    AP/P/2007/003875    BHP BILLITON SA LIMITED, 200 Hans Strijdom Drive, 2194       
            Randburg,       
                   
(22)    Filing Date :    08.07.2005    South Africa       
(24)    Date of Grant &    15.08.2011           
                   
(45)    Publication :

(30)    Priority Data            (72) Inventors   
    (33) Country    (31) Number    (32) Date    DE KOCK Sanette, South Africa   
    ZA    2004/5221    16.07.2004    BARNARD Paul, South Africa   
                   
                BOWKER Clint, South Africa   
                et al       
                (74) Representative   
(84)    Designated State           
                   
    BW  NA   ZM            HONEY & BLANCKENBERG   
                   
(51)    International    Classification    C22B 3/18 (2006.01)    C22B 15/00 (2006.01)   

(54)    Title

Optimization of bioleaching process.

(57)    Abstract

A method for optimizing a bioleaching process, at least in respect of heat generation and primary copper sulphide leaching, by actively monitoring and controlling inorganic and organic compounds in a raffinate solution, produced in the process, to levels below that which could be inhibitory to microbial activity of bioleaching strains used in the process.

(56)    Documents Cited :    WO 2004/027099 A    US 5 278 069 A    US 2001/002312 A1

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