Abstract: The present invention is directed to a precious metal recovery process in which carbonaceous material, such as preg robbing carbon, is floated after sulfide oxidation to separate the carbonaceous material from the precious metal.
Abstract: The present invention is directed to a precious metal recovery process in which basic ferric sulphates and/or jarosites are controlled by hot curing of the autoclave discharge slurry followed by decomposition of argentojarosite using strong acid consumers.
Type:
Grant
Filed:
June 11, 2007
Date of Patent:
August 28, 2012
Assignee:
Barrick Gold Corporation
Inventors:
Yeonuk Choi, Peter D. Kondos, Jacques McMullen
Abstract: A method and system are provided in which a gold and/or silver-collecting resin-in-leach circuit comprises both co-current and counter-current sections.
Abstract: The present invention is directed to a precious metal recovery process in which an acid sulfidic feed material is subjected to acid pressure oxidation and an alkaline sulfidic feed material is subjected to alkaline pressure oxidation, with the discharge slurries from the pressure oxidation processes being combined to reduce neutralization requirements prior to precious metal recovery.
Type:
Application
Filed:
November 21, 2011
Publication date:
May 24, 2012
Applicant:
Barrick Gold Corporation
Inventors:
John William Langhans, JR., Wilson Chung-Yeh Tsu
Abstract: The present invention is directed to a multi-compartment autoclave using inter-compartment dividers having one or more underflow openings for passing a feed stream between compartments.
Abstract: In the process of recovering platinum group metals from platinum group metal- and base metal-containing materials, the present invention uses reductants and a sulfur-deficient matte to aide the separation of the furnace matte from the furnace slag and therefore improve recovery of platinum group metals.
Type:
Grant
Filed:
September 11, 2008
Date of Patent:
September 13, 2011
Assignee:
Barrick Gold Corporation
Inventors:
Simon O. Fekete, Nathan M. Stubina, Jacques McMullen
Abstract: In an embodiment, the present invention relates to an apparatus and a process for producing a concentrated form of basic zinc sulphate from a, typically dilute, acidic zinc sulphate-bearing solution. The process embodiment comprises the steps of precipitating the zinc, preferably primarily as basic zinc sulphate, from the acidic zinc sulphate solution, preferably using calcium oxide, in such a way as to promote the formation of separate gypsum crystals and basic zinc sulphate particles, and upgrading the zinc content in the precipitates by separating the basic zinc sulphate from the gypsum using size separation techniques.
Abstract: Embodiments of the present invention are directed to flotation of sulfidic materials following aerating by an oxidizing gas and contacting by a sulfoxy reagent.
Abstract: The present invention is directed to flotation of refractory gold sulfide ores in which the ore is ground, floated, the tailings reground, and refloated to produce gold-bearing concentrates.
Type:
Grant
Filed:
September 11, 2008
Date of Patent:
April 12, 2011
Assignee:
Barrick Gold Corporation
Inventors:
Daniel Hillier, Barun Gorain, Jacques McMullen
Abstract: A method for suppressing mercury dissolution during pressure oxidation of precious metal-containing materials in the presence of halogens and halides is provided. Pressure oxidation is performed under controlled oxidative conditions to maintain the mercury predominantly in the solid residue.
Type:
Grant
Filed:
September 11, 2008
Date of Patent:
April 5, 2011
Assignee:
Barrick Gold Corporation
Inventors:
Daniel Hillier, Noelene Ahern, Yeonuk Choi
Abstract: A method for recovering zinc ions by selective zinc sulfide precipitation from an aqueous solution comprising zinc ions and metal ions of a metal that precipitates as a metal sulfide at a pH lower than a pH at which zinc ions precipitate as a zinc sulfide.
Type:
Grant
Filed:
October 30, 2007
Date of Patent:
January 4, 2011
Assignee:
Barrick Gold Corporation
Inventors:
Yeonuk Choi, Peter Kondos, Jacques McMullen
Abstract: Precious metal recovery by thiosulfate leaching where thiosulfate lixiviant is generated in situ employing elemental sulfur generated from partial oxidation of sulfidic precious metal-bearing feed and/or employing reactants from processing effluent.
Type:
Grant
Filed:
November 10, 2006
Date of Patent:
August 11, 2009
Assignee:
Barrick Gold Corporation
Inventors:
Yeonuk Choi, Peter Kondos, Mark Graham Aylmore, Jacques McMullen, Gus Van Weert
Abstract: The present invention is directed to flotation of refractory gold sulfide ores in which the ore is ground, floated, the tailings reground, and refloated to produce gold-bearing concentrates.
Type:
Application
Filed:
September 11, 2008
Publication date:
March 19, 2009
Applicant:
BARRICK GOLD CORPORATION
Inventors:
Daniel Hillier, Barun Gorain, Jacques McMullen
Abstract: The present invention is directed to flotation of refractory gold sulfide ores and to pressure oxidized residue neutralization using flotation tailings that have been contacted with an off gas of pressure oxidation.
Type:
Application
Filed:
September 12, 2008
Publication date:
March 19, 2009
Applicant:
Barrick Gold Corporation
Inventors:
Daniel Hillier, Yeonuk Choi, Noelene Ahern
Abstract: In the process of recovering platinum group metals from platinum group metal- and base metal-containing materials, the present invention uses reductants and a sulfur-deficient matte to aide the separation of the furnace matte from the furnace slag and therefore improve recovery of platinum group metals.
Type:
Application
Filed:
September 11, 2008
Publication date:
March 19, 2009
Applicant:
Barrick Gold Corporation
Inventors:
Simon O. Fekete, Nathan M. Stubina, Jacques McMullen
Abstract: A method for suppressing mercury dissolution during pressure oxidation of precious metal-containing materials in the presence of halogens and halides is provided. Pressure oxidation is performed under controlled oxidative conditions to maintain the mercury predominantly in the solid residue.
Type:
Application
Filed:
September 11, 2008
Publication date:
March 19, 2009
Applicant:
BARRICK GOLD CORPORATION
Inventors:
Daniel Hillier, Noelene Ahern, Yeonuk Choi
Abstract: The present invention is directed to a precious metal recovery process in which carbonaceous material, such as preg robbing carbon, is floated after sulfide oxidation to separate the carbonaceous material from the precious metal.
Abstract: A method for recovering zinc ions by selective zinc sulfide precipitation from an aqueous solution comprising zinc ions and metal ions of a metal that precipitates as a metal sulfide at a pH lower than a pH at which zinc ions precipitate as a zinc sulfide.
Type:
Application
Filed:
October 30, 2007
Publication date:
November 6, 2008
Applicant:
Barrick Gold Corporation
Inventors:
Yeonuk Choi, Peter Kondos, Jacques McMullen
Abstract: The present invention is directed to a precious metal recovery process in which basic ferric sulphates and/or jarosites are controlled by hot curing of the autoclave discharge slurry followed by decomposition of argentojarosite using strong acid consumers.
Type:
Application
Filed:
June 11, 2007
Publication date:
December 20, 2007
Applicant:
BARRICK GOLD CORPORATION
Inventors:
Yeonuk Choi, Peter Kondos, Jacques McMullen