Search Patents
  • Production of zinc sulphate concentrates from a dilute zinc sulphate solution
    Patent number: 8900535
    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.
    Type: Grant
    Filed: January 7, 2011
    Date of Patent: December 2, 2014
    Assignee: Barrick Gold Corporation
    Inventor: Yeonuk Choi
  • PRODUCTION OF ZINC SULPHATE CONCENTRATES FROM A DILUTE ZINC SULPHATE SOLUTION
    Publication number: 20110165059
    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.
    Type: Application
    Filed: January 7, 2011
    Publication date: July 7, 2011
    Applicant: BARRICK GOLD CORPORATION
    Inventor: Yeonuk Choi
  • Co-current and counter current resin-in-leach in gold leaching processes
    Patent number: 9790572
    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.
    Type: Grant
    Filed: August 5, 2013
    Date of Patent: October 17, 2017
    Assignee: Barrick Gold Corporation
    Inventors: Yeonuk Choi, Samir Chefai
  • Co-current and counter current resin-in-leach in gold leaching processes
    Patent number: 10415116
    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.
    Type: Grant
    Filed: October 5, 2017
    Date of Patent: September 17, 2019
    Assignee: Barrick Gold Corporation
    Inventors: Yeonuk Choi, Samir Chefai
  • Co-current and counter current resin-in-leach in gold leaching processes
    Patent number: 8715389
    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.
    Type: Grant
    Filed: December 7, 2011
    Date of Patent: May 6, 2014
    Assignee: Barrick Gold Corporation
    Inventors: Yeonuk Choi, Samir Chefai
  • Co-Current and Counter Current Resin-In-Leach in Gold Leaching Processes
    Publication number: 20140035207
    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.
    Type: Application
    Filed: August 5, 2013
    Publication date: February 6, 2014
    Applicant: BARRICK GOLD CORPORATION
    Inventors: Yeonuk CHOI, Samir CHEFAI
  • CO-CURRENT AND COUNTER CURRENT RESIN-IN-LEACH IN GOLD LEACHING PROCESSES
    Publication number: 20120183433
    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.
    Type: Application
    Filed: December 7, 2011
    Publication date: July 19, 2012
    Applicant: BARRICK GOLD CORPORATION
    Inventors: Yeonuk Choi, Samir Chefai
  • Co-Current and Counter Current Resin-In-Leach in Gold Leaching Processes
    Publication number: 20180030571
    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.
    Type: Application
    Filed: October 5, 2017
    Publication date: February 1, 2018
    Inventors: Yeonuk CHOI, Samir CHEFAI
  • Method for pre-treatment of gold-bearing oxide ores
    Patent number: 10161016
    Abstract: The disclosure relates to pre-treatment of precious metal-bearing oxide ores, prior to precious metal leaching by thiosulfate. The process comprises mixing oxide ore in oxygenated water in the presence of a carbon-based material (e.g., activated carbon or other type of carbon). The carbon-based material can be separated from the ore slurry, and, the gold is thereafter leached by a thiosulfate lixiviant.
    Type: Grant
    Filed: May 27, 2014
    Date of Patent: December 25, 2018
    Assignee: Barrick Gold Corporation
    Inventors: Yeonuk Choi, Ahmad Ghahremaninezhad Gharelar
  • METHOD FOR PRE-TREATMENT OF GOLD-BEARING OXIDE ORES
    Publication number: 20140356225
    Abstract: The disclosure relates to pre-treatment of precious metal-bearing oxide ores, prior to precious metal leaching by thiosulfate. The process comprises mixing oxide ore in oxygenated water in the presence of a carbon-based material (e.g., activated carbon or other type of carbon). The carbon-based material can be separated from the ore slurry, and, the gold is thereafter leached by a thiosulfate lixiviant.
    Type: Application
    Filed: May 27, 2014
    Publication date: December 4, 2014
    Inventors: Yeonuk Choi, Ahmad Ghahremaninezhad Gharelar
  • METHOD FOR PRE-TREATMENT OF GOLD-BEARING OXIDE ORES
    Publication number: 20200165702
    Abstract: The disclosure relates to pre-treatment of precious metal-bearing oxide ores, prior to precious metal leaching by thiosulfate. The process comprises mixing oxide ore in oxygenated water in the presence of a carbon-based material (e.g., activated carbon or other type of carbon). The carbon-based material can be separated from the ore slurry, and, the gold is thereafter leached by a thiosulfate lixiviant.
    Type: Application
    Filed: January 29, 2020
    Publication date: May 28, 2020
    Applicant: Barrick Gold Corporation
    Inventors: Yeonuk Choi, Ahmad Ghahremaninezhad Gharelar
  • Method for pre-treatment of gold-bearing oxide ores
    Patent number: 10597752
    Abstract: The disclosure relates to pre-treatment of precious metal-bearing oxide ores, prior to precious metal leaching by thiosulfate. The process comprises mixing oxide ore in oxygenated water in the presence of a carbon-based material (e.g., activated carbon or other type of carbon). The carbon-based material can be separated from the ore slurry, and, the gold is thereafter leached by a thiosulfate lixiviant.
    Type: Grant
    Filed: October 11, 2017
    Date of Patent: March 24, 2020
    Assignee: BARRICK GOLD CORPORATION
    Inventors: Yeonuk Choi, Ahmad Ghahremaninezhad Gharelar
  • Use of cationic surfactants in the cyanidation of refractory carbonaceous ores for recovery of metals
    Patent number: 9803260
    Abstract: A process for recovery of precious metals from ores or concentrates containing refractory carbonaceous material by cyanidation leaching. The process involves addition to the ores or concentrates at least one cationic surfactant before or during the addition of cyanide-containing solution. The agent enables the recovery of precious metals by cyanidation from high preg-robbing carbonaceous ores and improves the recovery of precious metals by cyanidation from medium to low preg-robbing carbonaceous ores. The agent also prevents froth and foaming formation during the cyanidation process.
    Type: Grant
    Filed: April 17, 2014
    Date of Patent: October 31, 2017
    Assignee: AKZO NOBEL CHEMICALS INTERNATIONAL B.V.
    Inventors: Qiong Zhou, Junhua Jiang, Yeonuk Choi
  • METHOD FOR PRE-TREATMENT OF GOLD-BEARING OXIDE ORES
    Publication number: 20180030572
    Abstract: The disclosure relates to pre-treatment of precious metal-bearing oxide ores, prior to precious metal leaching by thiosulfate. The process comprises mixing oxide ore in oxygenated water in the presence of a carbon-based material (e.g., activated carbon or other type of carbon). The carbon-based material can be separated from the ore slurry, and, the gold is thereafter leached by a thiosulfate lixiviant.
    Type: Application
    Filed: October 11, 2017
    Publication date: February 1, 2018
    Inventors: Yeonuk Choi, Ahmad Ghahremaninezhad Gharelar
  • Method for pre-treatment of gold-bearing oxide ores
    Patent number: 11401580
    Abstract: The disclosure relates to pre-treatment of precious metal-bearing oxide ores, prior to precious metal leaching by thiosulfate. The process comprises mixing oxide ore in oxygenated water in the presence of a carbon-based material (e.g., activated carbon or other type of carbon). The carbon-based material can be separated from the ore slurry, and, the gold is thereafter leached by a thiosulfate lixiviant.
    Type: Grant
    Filed: January 29, 2020
    Date of Patent: August 2, 2022
    Assignee: Barrick Gold Corporation
    Inventors: Yeonuk Choi, Ahmad Ghahremaninezhad Gharelar
  • Process for mercury control during pressure oxidation
    Patent number: 7918919
    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
  • Recovery of Metals from Materials Containing Lithium and Iron
    Publication number: 20240313285
    Abstract: Methods for recycling lithium and iron containing material, such as batteries, include selectively leaching lithium from the material by disposing the material in a powder form in a solution comprising formic acid and hydrogen peroxide, filtering the solution to obtain a first leach liquor comprising lithium and a residue comprising iron phosphate and carbon, subjecting the first leach liquor to a first precipitation to remove residual iron from the leach liquor and obtain a second leach liquor, and subjecting the second leach liquor to a second precipitation, wherein lithium is precipitated and a third leach liquor is obtained. The third leach liquor may be subjected to a third precipitation using trisodium phosphate or sodium carbonate. The material may be a battery cathode, such as a lithium iron phosphate battery cathode.
    Type: Application
    Filed: December 17, 2021
    Publication date: September 19, 2024
    Inventors: Ahmad Ghahreman, Harshit Mahandra, Yeonuk Choi
  • MICROBIAL PRE-TREATMENT OF DOUBLE REFRACTORY GOLD ORES
    Publication number: 20090158893
    Abstract: The present invention is directed to recovery of gold from refractory and double refractory ores using a fungal agent and/or culture media.
    Type: Application
    Filed: November 24, 2008
    Publication date: June 25, 2009
    Applicant: BARRICK GOLD CORPORATION
    Inventors: Wan-Tai Yen, Richard Kwasi Amankwah, Yeonuk Choi
  • Process for reduced alkali consumption in the recovery of silver
    Patent number: 8252254
    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
  • PROCESS FOR MERCURY CONTROL DURING PRESSURE OXIDATION
    Publication number: 20090074608
    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
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