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(11)    Patent No :    AP 2609    (73) Applicant(s)       
(21)    Application No :    AP/P/2009/004867    UNIVERSITY OF CAPE TOWN, Lovers Walk, Rondebosch,       
            Cape Town, 7701,       
                   
(22)    Filing Date :    13.11.2007    South Africa       
(24)    Date of Grant &    05.03.2013           
                   
(45)    Publication :

(30)    Priority Data            (72) Inventors   
    (33) Country    (31) Number    (32) Date    BRADSHAW Deirdre Jane, Australia   
    ZA    2006/09492    15.11.2006    NEWELL Andrew James Haigh, Australia   
                   
                (74) Representative   
(84)    Designated State           
                   
    BW  T Z   ZM   ZW        FISHER CORMACK & BOTHA   
                   
(51)    International    Classification    C22B 1/00 (2006.01)    C22B 3/02 (2006.01)   
            C22B 15/00 (2006.01)    C22B 23/00 (2006.01)   
            B03D 1/00 (2006.01)       

(54)    Title

Sulfidisation process and apparatus for enhanced recovery of oxidised and surface oxidised base and precious metal minerals

(57)    Abstract

A method of treating value bearing material comprising oxidised or surface oxidised mineral values includes the steps of crushing the value bearing material, contacting the crushed material with a sulfide solution to sulfide the oxidised or surface oxidised mineral values, and adding ions of a selected base metal to the crushed value bearing material. The value bearing material may comprise oxidised or surface oxidised base metal or precious metal minerals. The crushed value bearing material is prepared as a slurry or pulp comprising from 15% to 40% solids and the remainder comprising water. The sulfide solution preferably comprises a soluble sulfidiser such as sodium hydrosulfide and the base -metal ion solution preferably comprises metal salt of base metals like copper or iron. In a preferred embodiment of the method, the sulfide ion concentration in the slurry is measured with an ion- specific probe which measures the sulfide ion concentration as a potential, and the quantity of sulfidiser solu tion in the slurry is adjusted to maintain the measured sulfide ion concentration at or near the predetermined value. The invention extends to an installation for treating value bearing material according to the method.

(56)    Documents Cited :    NEWELL A.J.H. et : Vol. 19, 2006, Pages 675-686    NEWELL A.H.J.et al: vol. 84, 2007, pages

108-117, XP002474860 PAGE 110: FIGURES 1,2.    NEWELL A.J.H:BRADSHAW W D.J.
MINERALS ENGINEERING, NO. 20, 2007, PAGES 1039-1047, XP002474861. PAGE 104,

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