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(11)    Patent No :    AP 1982   
(21)    Application No :    AP/P/2007/004035   
(22)    Filing Date :    12.12.2005   
(24)    Date of Grant &    24.03.2009   
           
(45)    Publication :

(30)  Priority Data       
(33) Country    (31) Number    (32) Date
US    60/638,685    22.12.2004
US    60/678,001    04.05.2005
US    11/249,120    11.10.2005

et al

(84)    Designated State

BW    GM  GH   KE   LS   MW  MZ   NA   SL

SD    SZ   T Z   UG   ZM   ZW


(73) Applicant(s)

PLACER DOME TECHNICAL SERVICES LIMITED, 1600 -1055

Dunsmunir Street, Vancouver, British Columbia  V7X 1P1,
Canada

(72) Inventors

KING James A, Canada

JI Jinxing, Canada

FLEMING Christopher Andrew, Canada

et al

(74) Representative

GILL, GODLONTON & GERRANS

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

(54)    Title

Reduction of lime consumption when treating refractory gold ores or concentrates

(57)    Abstract

The present invention is directed to a precious metal recovery process in which basic sulphates and/or jarosites are controlled by a number of mechanisms, including control of the oxidation reaction conditions in the first autoclave compartment, hot curing of the autoclave discharge slurry, and/or contacting of the autoclave feed slurry with the hot cured discharge liquid. Through curing, reactive iron-containing precipitate, such as basic iron pupate, is allowed to react with acid to form a dissolved iron-containing species, such as ferric sulphate.


(56)    Documents Cited :    US 4 606 763 A    US 5 071 477 A    US 5 489 326 A

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