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(11)    Patent No :    AP 2137   
(21)    Application No :    AP/P/2007/004063   
(22)    Filing Date :    15.12.2005   
(24)    Date of Grant &    19.07.2010   
(45)    Publication :

(30)  Priority Data       
(33) Country    (31) Number    (32) Date
ZA    2004/10146    15.12.2004

(84)    Designated State

BW    GM    GH    KE    LS    MW  MZ   NA   SL
SD    SZ    T Z    UG    ZM    ZW

(73) Applicant(s)


Club House Street, Maraisburg 1709, Gauteng,
South Africa

(72) Inventors

SINGH Adrian, South Africa

TINNISWOOD Brian, South Africa

BATTERSBY Michael, United Kingdom

et al

(74) Representative


(51)  International  Classification   C22B 1/00 (2006.01)    C22B  3/00 (2006.01)
C22B    3/04 (2006.01)    C22B 11/00 (2006.01)
C22B 11/08 (2006.01)   

(54)    Title

Extraction process for metals like gold and platinum including fine grinding, pulping and oxygenating

(57)    Abstract

This invention relates to a process for obtaining metal values, typically base metals,platinum or gold from a feed material. In a first step of the process of the invention, feed material containing metal values is ground to a particle size d90 of 100 microns or less to form an ultra fine pulp. In a second step of the rocess of the invention, the ultra fine ground pulp from the first step is oxygenated by pumping it in multiple passes through an in-line high shear static oxygenation device (30), while re-circulating it on a tank (28) or

any other vessel. The process of the invent ion results in a significant reduction in the required leach time, improved recoveries, reduced cyanide consumptions, a steadier gold tail, as well as reduced capital and operational expenditure.

(56)    Documents Cited :    AU 2718292 A    US 4738718 A    EP 0574175 A


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