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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)

MAELGWYN MINERAL SERVICES AFRICA (PTY) LTD, 1332

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

FISHER CORMACK & BOTHA
 

(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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