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(11)    Patent No :    AP 2503    (73) Applicant(s)       
(21)    Application No :    AP/P/2009/004799    ENPAR TECHNOLOGIES INC., 449 Laird Road, Unit 12,       
            Guelph, Ontario N1G 4W1,       
(22)    Filing Date :    13.09.2007    Canada       
(24)    Date of Grant &    24.10.2012           
(45)    Publication :

(30)    Priority Data            (72) Inventors   
    (33) Country    (31) Number    (32) Date    SEED Leonard Paul, Canada   
    GB    0618025.1    13.09.2006    SHELP Gene Sidney, Canada   
                (74) Representative   
(84)    Designated State           
    BW  T Z   ZW            FISHER CORMACK & BOTHA   
(51)    International    Classification    C22B 3/06 (2006.01)    C01G  53/00 (2006.01)   
            C22B 23/06 (2006.01)    C22B 7/00 (2006.01)   
            C25C 1/08 (2006.01)    C25C 7/02 (2006.01)   
            C25C 7/06 (2006.01)       

(54)    Title

Extraction of metals from sulphide minerals

(57)    Abstract

Nickel entrained in the sulphide mineral pyrrhotite is engineered to dissolve in leaching acid in a two step procedure. First, a slurry of the mineral and the acid is activated by oxidation. This is done in a time Tl by electrolysis; or alternatively chemically, by adding e.g an oxidising acid to the mineral. After activation, the slurry is then kept under anoxic conditions for a time T2. During T2, the sulphide starts to dissolve much more rapidly, and the rapid breakdown of the sulphide enables the nickel to dissolve and thus to be leached out of the mineral. The dissolved nickel is extracted from the leaching

(56)    Documents Cited :    THOMAS, J.E., C.F. SKINNER, W M SMART R.S.C.    US 4024218 A    US 4571262 A


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