Patent Us Gold Recovery From Thiosulfate Leaching

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US Patent for Gold recovery from thiosulfate leaching,

Processes for recovering gold from copper-gold ores thiosulfate leaching or gold ores copper catalyzed thiosulfate leaching using ion exchange technology are disclosed. The processes include subjecting the gold-bearing and copper-bearing thiosulfate solution to a pH and/or temperature adjustment to reduce tetrathionate concentration in the thiosulfate solution prior to contacting with anUS6632264B2 - Gold recovery from thiosulfate leaching,,Processes for recovering gold from copper-gold ores thiosulfate leaching or gold ores copper catalyzed thiosulfate leaching using ion exchange technology are disclosed. The processes include subjecting the gold-bearing and copper-bearing thiosulfate solution to a pH and/or temperature adjustment to reduce tetrathionate concentration in the thiosulfate solution prior to contacting with anUS Patent Application for Gold recovery from thiosulfate,,Processes for recovering gold from copper-gold ores thiosulfate leaching or gold ores copper catalyzed thiosulfate leaching using ion exchange technology are disclosed. The processes include subjecting the gold-bearing and copper-bearing thiosulfate solution to a pH and/or temperature adjustment to reduce tetrathionate concentration in the thiosulfate solution prior to contacting with an

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US Patent for Gold recovery from refractory carbonaceous,

Justia Patents Gold(au) Recovered As Free Metal US Patent for Gold recovery from refractory carbonaceous ores by pressure oxidation, thiosulfate leaching and resin-in-pulp adsorption Patent (Patent # 5,785,736)AU5181201A - Gold recovery from thiosulfate leaching,,AU5181201A - Gold recovery from thiosulfate leaching - Google Patents Gold recovery from thiosulfate leaching Download PDF Info Publication number,2001-04-17 Priority to US09/837,756 priority patent/US6632264B2/en 2001-06-07 Application filed by University of British Columbia filed Critical University of British ColumbiaUS Patent for Gold recovery from refractory carbonaceous,,A process for recovering gold in which an ore slurry of refractory sulfidic and refractory carbonaceous ore having preg-robbing characteristics due to the presence of organic carbon is subjected to pressure oxidation in an autoclave. The oxidized ore slurry is mixed with a thiosulfate salt lixiviant, which mixture is maintained at a pH between 7 and 8.7 while the slurry is agitated in a,

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Gold recovery from thiosulfate leaching - ZHANG HONGGUANG

Processes for recovering gold from copper-gold ores thiosulfate leaching or gold ores copper catalyzed thiosulfate leaching using ion exchange technology are disclosed. The processes include subjectin,Gold recovery from thiosulfate leaching . United States Patent Application 20030051581 . Kind Code: A1 . Abstract: Processes for recovering,US5536297A - Gold recovery from,- Google Patents,A process for recovering gold in which an ore slurry of refractory sulfidic and refractory carbonaceous ore having preg-robbing characteristics due to the presence of organic carbon is subjected to pressure oxidation in an autoclave. The oxidized ore slurry is mixed with a thiosulfate salt lixiviant, which mixture is maintained at a pH between 7 and 8.7 while the slurry is agitated in a,Gold recovery from ammonia-thiosulfate leaching solution,,Nov 01, 2019· Recovery of gold from thiosulfate leaching solution.,(Patent No. 123626, 2001). That capability is directly related to the presence of a large number of protonated amino groups of PEI on the surface of MNPs, and to the availability of a large number of active sites on the surface of the magnetic material that allow greater attraction of the,

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METHOD FOR CARBON-CATALYSED THIOSULFATE LEACHING OF

The catalyzed thiosulfate leach of gold from oxide ores was been evaluated. The pretreatment process of U.S. Pat. No. 10,161,016 was tested but it was sometimes difficult to reproduce results. Since a process that can increase the recovery of gold in thiosulfate leaching to such extent is promising, it was decided to further investigate it.Gold recovery from thiosulfate leaching - ZHANG HONGGUANG,Processes for recovering gold from copper-gold ores thiosulfate leaching or gold ores copper catalyzed thiosulfate leaching using ion exchange technology are disclosed. The processes include subjectin,Gold recovery from thiosulfate leaching . United States Patent Application 20030051581 . Kind Code: A1 . Abstract: Processes for recovering,Gold recovery from ammonia-thiosulfate leaching solution,,Nov 01, 2019· Recovery of gold from thiosulfate leaching solution.,(Patent No. 123626, 2001). That capability is directly related to the presence of a large number of protonated amino groups of PEI on the surface of MNPs, and to the availability of a large number of active sites on the surface of the magnetic material that allow greater attraction of the,

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US Patent for Recovery of precious metals from thiosulfate,

In one aspect, the present invention provides a method for recovering precious metal, and particularly gold, from a particulate substrate loaded with a precious metal-containing coating, in which a portion, but less than substantially all, of the particulate substrate is dissolved away to physically release precious metal-containing coating from the particulate substrate.The recovery of gold from ammoniacal thiosulfate solutions,,Mar 01, 2004· Recent publications and patents O'Malley and Nicol, 2001, Zhang and Dreisinger, 2002a, Fleming et al., 2002 have shown the possibility of using ion exchange resins to recover gold from thiosulfate solutions and leach pulps. Therefore the loading and elution behavior of gold and copper has been investigated in the current work using ion exchange,Recovering gold from thiosulfate leach pulps via ion,,A.R. March bank et al., “Gold Recovery from Refractory Carbonaceous Ores by Pressure Oxidation and Thiosulfate Leaching,” U.S. patent 5,536,297 (15 February 1995). 3. R.Y. Wan and K.M. LeVier, “Research and Development Activities for the Recovery of Gold from Non Cyanide Solutions” (Paper presented at the SME Conference, Salt Lake City,

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Thiosulphate Leaching | SGS

In recovery operations that are affected by “preg-robbing” ores, it can yield substantially better recovery than cyanide. Thiosulfate leaching is particularly well suited to state-of-the-art resin-in-pulp (RIP) gold recovery technologies Thiosulfate leaching is an alkaline process (usually operated in the pH 8 to 10 range) so there are no,METHOD FOR CARBON-CATALYSED THIOSULFATE LEACHING OF GOLD,The catalyzed thiosulfate leach of gold from oxide ores was been evaluated. The pretreatment process of U.S. Pat. No. 10,161,016 was tested but it was sometimes difficult to reproduce results. Since a process that can increase the recovery of gold in thiosulfate leaching to such extent is promising, it was decided to further investigate it.US 2010/0111751 A1 - Method For Thiosulfate Leaching Of,,The Lens serves almost all the patents and scholarly work in the world as a free, open and secure digital public good, with user privacy a paramount focus.

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Ammonium thiosulfate complex of gold or silver and an,

United States Patent 6197214,from an aqueous ammoniacal thiosulfate leach solution to provide a significant practical and economical process for the recovery of gold or silver. After leaching of the ore with an aqueous ammoniacal thiosulfate solution, the leach solution is contacted with a precious metal extraction reagent to extract the,US 8821613 B2 - Method For Thiosulfate Leaching Of,,The Lens serves almost all the patents and scholarly work in the world as a free, open and secure digital public good, with user privacy a paramount focus.Improvement of thiosulfate stability in gold leaching,Ammonium thiosulfate is a noncyanide lixiviant for gold leaching. However, the major problem with this leaching method has been the high consumption of reagents. To leach a mild-refractory copper-bearing gold ore, the authors used a reagent combination of 0.3M (NH4)2S2O3, 0.03M CuSO4 and 3M NH3 at pH 10.2 for 24 hours. In the testing, thiosulfate consumption was 30 kg/t of ore.

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Ion Exchange Resin Technology in Recovery of Precious and,

Zhang H (2003) 264 D Dreisinger. US Patent 6, 632, undefined 2003, Gold recovery from thiosulfate leaching, 6,632,264.,O’Malley GP (2001) Recovery of gold from thiosulfate solutions and pulps with ion-exchange resins.,Brunt SD (2010) Ion exchange adsorption and elution for recovering gold thiosulfate from leach solutions,Solution chemistry factors for gold thiosulfate heap leaching,Sep 29, 2003· Gold recovery was achieved with copper cementation. After gold recovery, the barren solution was recycled back to the heap for leaching. A total of 55,790 oz of gold was produced from the thiosulfate leach technology. In this paper, the solution chemistry factor for gold leaching with ammonium thiosulfate was discussed.THIOSULPHATE LEACHING – AN ALTERNATIVE TO,• Thiosulphate leaching yields similar gold recovery as cyanide in some cases, while in cases such as preg-robbing ores (naturally occurring carbonaceous material that preferentially absorbs the gold cyanide complex but not the gold thiosulphate complex), it can yield substantially better recovery than cyanide.

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Recovering gold from thiosulfate leach pulps via ion,

A.R. March bank et al., “Gold Recovery from Refractory Carbonaceous Ores by Pressure Oxidation and Thiosulfate Leaching,” U.S. patent 5,536,297 (15 February 1995). 3. R.Y. Wan and K.M. LeVier, “Research and Development Activities for the Recovery of Gold from Non Cyanide Solutions” (Paper presented at the SME Conference, Salt Lake City,"Method for Aqueous Gold Thiosulfate Extraction Using,,A gold thiosulfate leaching process uses carbon to remove gold from the leach liquor. The activated carbon is pretreated with copper cyanide. A copper (on the carbon) to gold (in solution) ration of at least 1.5 optimizes gold recovery from solution. To recover the gold from the carbon, conventional elution technology works but is dependent on the copper to gold ratio on the carbon.Solution chemistry factors for gold thiosulfate heap leaching,Sep 29, 2003· Gold recovery was achieved with copper cementation. After gold recovery, the barren solution was recycled back to the heap for leaching. A total of 55,790 oz of gold was produced from the thiosulfate leach technology. In this paper, the solution chemistry factor for gold leaching with ammonium thiosulfate was discussed.

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[title]

The recovery of gold from ammoniacal thiosulfate solutions,

Mar 01, 2004· Recent publications and patents O'Malley and Nicol, 2001, Zhang and Dreisinger, 2002a, Fleming et al., 2002 have shown the possibility of using ion exchange resins to recover gold from thiosulfate solutions and leach pulps. Therefore the loading and elution behavior of gold and copper has been investigated in the current work using ion exchange,Thiosulphate Leaching | SGS,In recovery operations that are affected by “preg-robbing” ores, it can yield substantially better recovery than cyanide. Thiosulfate leaching is particularly well suited to state-of-the-art resin-in-pulp (RIP) gold recovery technologies Thiosulfate leaching is an alkaline process (usually operated in the pH 8 to 10 range) so there are no,Ammonium thiosulfate complex of gold or silver and an,,United States Patent 6197214,from an aqueous ammoniacal thiosulfate leach solution to provide a significant practical and economical process for the recovery of gold or silver. After leaching of the ore with an aqueous ammoniacal thiosulfate solution, the leach solution is contacted with a precious metal extraction reagent to extract the,

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THE RECOVERY OF GOLD FROM A PREAGNANT GOLD-THIOSULFATE

These results indicate that gold can be removed from thiosulfate solutions rapidly and loaded on resins to very high concentrations. Subsequent gold elution with thiocyanate ions was very efficient; the concentration of gold on resin was reduced from about 2-3 kg/L down to less than 10 ppm (99,9% elution) under ambient temperature in 2-4 hours.US 2010/0111751 A1 - Method For Thiosulfate Leaching Of,,The Lens serves almost all the patents and scholarly work in the world as a free, open and secure digital public good, with user privacy a paramount focus.Ammoniacal thiosulfate leaching of pressure oxidized,,Jan 01, 2015· The major problems facing thiosulfate processes are the high consumption of thiosulfate and the challenges posed by the recovery of the gold after the leaching stage (Muir and Aylmore, 2004, Hilson and Monhemius, 2006). One of the challenges to evaluation and adoption of the thiosulfate process is the complicated chemistry of the leaching,

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[title]

Ion Exchange Resin Technology in Recovery of Precious and,

Zhang H (2003) 264 D Dreisinger. US Patent 6, 632, undefined 2003, Gold recovery from thiosulfate leaching, 6,632,264.,O’Malley GP (2001) Recovery of gold from thiosulfate solutions and pulps with ion-exchange resins.,Brunt SD (2010) Ion exchange adsorption and elution for recovering gold thiosulfate from leach solutions,Thiosulphate leaching: Recovery of gold from pregnant,,Co-Current and Counter Current Resin-in-Leach in Gold Leaching Processes. US Patent. Jan 2012,of commercially available anion exchange resins for the recovery of gold from thiosulfate leach,US 8597399 B2 - Method For Thiosulfate Leaching Of,,The Lens serves almost all the patents and scholarly work in the world as a free, open and secure digital public good, with user privacy a paramount focus.

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The treatment of copper–gold ores by ammonium thiosulfate,

Oct 01, 2002· The application of a thiosulfate salt lixiviant to recover gold from an oxidative pressure leach slurry is described in a patent granted to Marchbank et al. (1996). A slurry of refractory sulfidic and refractory carbonaceous ore is subjected to pressure oxidation in an autoclave under neutral or alkaline conditions followed by leaching with a,Patent Issued to Montana Tech Faculty Member, Dr. Courtney,,Patent Issued to Montana Tech Faculty Member, Dr. Courtney Young, for Gold Recovery from Thiosulfate Leach Solutions. 01/14/2014. On April 26, 2011, Dr. Courtney Young, Department Head of the Metallurgical and Materials Engineering at Montana Tech, filed a patent, “Method for Aqueous Gold Thiosulfate Extraction Using Copper-Cyanide Pretreated Carbon Adsorption,” based on several,

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