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(11)    Patent No :    AP 2270    (73) Applicant(s)       
(21)    Application No :    AP/P/2008/004397    BHP BILLITON SA LIMITED, 200 Malibongwe Drive,       
            Randburg 2194,       
                   
(22)    Filing Date :    15.09.2006    South Africa       
(24)    Date of Grant &    09.08.2011           
                   
(45)    Publication :

(30)    Priority Data            (72) Inventors   
    (33) Country    (31) Number    (32) Date    RORKE Gary, Vernon, South Africa   
    ZA    2005/07453    15.09.2006    (74) Representative   
(84)    Designated State           
               
    BW  NA   ZM            HONEY & BLANCKENBERG   
               
(51)    International    Classification    C22B 3/00 (2006.01)   



(54)    Title

Bioleaching process control.

(57)    Abstract

A process of bioleaching a sulphide mineral slurry in a reactor which is controlled by varying the rate of supply of sparging gas to the reactor, and the energy supplied to a motor-driven agitator in the reactor, in response to the measured or Inferred oxygen demand of the slurry.


(56)    Documents Cited :    US 5 007 620 A    WO 02/42504 A   WO 02/081761 A

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