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how to make thiosulfate leaching of gold

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  Method for thiosulfate leaching of precious metal

  2015-10-29 · gold surface that hindered the gold dissolution 7 . Moreover the heavy metal ions in thiosulfate solution reacted with thiosulfate by competing with gold and thus hindering gold leaching 8 9 . It was reported that arsenopyrite was also detrimental to thiosulfate leaching of gold. It inhibited gold dissolution but had unobvious effect on

  FACTORS AFFECTING GOLD LEACHING IN THIOSULFATE-O 2

  The research into leaching of gold with thiosulfate as an alternative lixiviant to cyanide has predominantly involved the use of copper in the presence of ammonia which serves as the oxidant. However there are concerns about the health and environmental risks of ammonia (or ammonium). At CSIRO continued research has been carried out to look for different oxidants for the thiosulfate leaching

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  Thiosulphate Leaching SGS

  Thiosulphate Leaching. Thiosulfate leaching is a process that recovers gold from ore without the use of cyanide. SGS developed the thiosulfate leaching process because in some jurisdictions increased regulation pressure means that cyanide cannot be used or transported. We are a global technical leader in the field of thiosulfate leaching.

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  Ammoniacal thiosulphate leaching of gold ore

  2016-6-2 · leaching of gold as its absence makes gold passive by the build up of sulphur coating on the surface as a result of decomposition of thiosulphate. It is known that thiosulphate is a meta-stable species that readily undergoes decomposition in aqueous solutions. Ammonia adsorbs onto the gold surface preferentially over

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  Thiosulfate leaching of gold—A reviewScienceDirect

  Thiosulfate leaching can be considered a non-toxic process the gold dissolution rates can be faster than conventional cyanidation and due to the decreased interference of foreign cations high gold recoveries can be obtained from the thiosulfate leaching of complex and carbonaceous-type ores. In addition thiosulfate can be cheaper than cyanide.

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  Improved thiosulfate leaching of a refractory

  2015-1-6 · Thiosulfate leaching without additive was not effective to treat a refractory gold concentrate calcine with high iron sulfur and arsenic due to its low gold extraction (72.7 ) and high thiosulfate consumption (42.4 ). Thus several additives including sodium chloride

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  Fundamental aspects of gold leaching in thiosulfate

  The kinetics and mechanism of gold leaching in the ammonia-thiosulfate-copper (ATS-Cu) system have been studied using the rotating electrochemical quartz crystal microbalance (REQCM). Anodic polarization cathodic polarization and leaching experiments were included in this study. The effect of concentration of different reagents applied potential pH temperature and electrode rotating

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  Thiosulfate Leaching Process for Gold Extraction

  2017-2-20 · Understanding gold thiosulfate leaching system plays a crucial role in order to effectively extract gold in which the kinetics and equilibrium adsorption of thiosulfate polythionates gold thiosulfate and copper onto resin in resin-solution systems are taken into account. Process models associated with the

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  Improved thiosulfate leaching of a refractory gold

  2015-2-1 · The roles of these additives in thiosulfate leaching of gold are widely believed to be that they can compete with thiosulfate anions to complex with cupric ions at axial coordinate sites and thus reduce the interaction between cupric ions and thiosulfate (Breuer and Jeffrey 2003b Feng and van Deventer 2011 Senanayake 2012).

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  US6632264B2Gold 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 an ion

  A Novel Thiosulfate System for Leaching Gold Without the

  A Comparison of Cyanide and Thiosulfate Leaching for the Recovery of Gold from a Copper Containing Ore. Dai X. / Chu C. K. / Jeffrey M. / Breuer P. / TMS 2003. print version. 139 A Review of the Chemistry Electrochemistry and Kinetics of the Gold Thiosulfate Leaching Process. Breuer P. L. /

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  Recovery of Gold from Thiosulfate Solutions and Pulps

  2010-12-21 · 3.6 CHEMISTRY OF GOLD LEACHING WITH THIOSULFATE 100 3.6.1 The Rate of Conversion of Copper (II) to Copper (I) 100 3.6.2 Stability of Copper (II) Amine in a Thiosulfate Solution 100 3.7 ADSORPTION EXPERIMENTS 102 3.7.1 Gold Loading on Various Commercial Resins 102 3.7.2 Loading of Sulfur Anions 102

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  Ammoniacal thiosulphate leaching of gold ore

  2016-6-2 · leaching of gold as its absence makes gold passive by the build up of sulphur coating on the surface as a result of decomposition of thiosulphate. It is known that thiosulphate is a meta-stable species that readily undergoes decomposition in aqueous solutions. Ammonia adsorbs onto the gold surface preferentially over

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  Study of the gold-thiosulfate interface under leaching

  Sweep voltammetry chronocoulometry and Surface Enhanced Raman Spectroscopy (SERS) were employed in this research program to characterize the gold-electrolyte interface under leaching conditions in alkaline thiosulfate solution. A new methodology was established that allowed for the measurement of the leaching currents from current-potential curves with minimal interference of the applied

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  Effect of arsenopyrite on thiosulfate leaching of gold

  2015-10-29 · gold surface that hindered the gold dissolution 7 . Moreover the heavy metal ions in thiosulfate solution reacted with thiosulfate by competing with gold and thus hindering gold leaching 8 9 . It was reported that arsenopyrite was also detrimental to thiosulfate leaching of gold. It inhibited gold dissolution but had unobvious effect on

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  Effect of additives on thiosulfate leaching of a gold ore

  2018-3-24 · Effect of additives on thiosulfate leaching of a gold ore S.J. Dai P.C. Li Q.Q. Wang D.W. Feng University of Science and Technology Liaoning Anshan China Received August 15 2017 Revised November 15 2017 The effect of additives on gold leaching was investigated using ammonium thiosulfate or calcium thiosulfate.

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  Gold recovery from thiosulfate leachingThe University

  Abstract 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

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  FACTORS AFFECTING GOLD LEACHING IN THIOSULFATE-O 2

  The research into leaching of gold with thiosulfate as an alternative lixiviant to cyanide has predominantly involved the use of copper in the presence of ammonia which serves as the oxidant. However there are concerns about the health and environmental risks of ammonia (or ammonium). At CSIRO continued research has been carried out to look for different oxidants for the thiosulfate leaching

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  Gold recovery from thiosulfate leachingThe University

  Abstract 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

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  Study on oxygen pressure thiosulfate leaching

  2019-5-13 · Thermodynamic calculations showed that the improvement of temperature and pressure was favorable to gold leaching by thiosulfate. However high temperature and pressure also caused high thiosulfate consumption (55.3 kg/t-ore of sodium thiosulfate) and relatively low gold extraction (87.6 ) without additives.

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  (PDF) Thiosulfate leaching of gold—A review Mark Aylmore

  Hemmati et al. (1989) investigated the thiosulfate leaching of gold from carbonaceous ore that contained 2.5 organic carbon. The optimum conditions for gold extraction were found to be 35°C and 103 kPa oxygen over pressure pH 10.5 3M NH3 with a lixiviant containing 0.71M (NH4)2S203 0.15M CuSO4 and 0.1M (NH4)2SO3.

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  (PDF) A Review of Thiosulfate Leaching of Gold Focus on

  2017-6-15 · Ahern N. Thiosulfate Degradation during Gold Leaching in Ammoniacal Thiosulfate So lutions A Focus Trithionate. Ph .D. Thesis Univer sity of British Columbia V

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  Factors affecting gold leaching in thiosulfate-O2 solutions

  2013-5-30 · ALTA 2013 Gold Conference Perth WA Australia 25 May1 June 2013 Pages 9p Abstract The research into leaching of gold with thiosulfate as an alternative lixiviant to cyanide has predominantly involved the use of copper in the presence of ammonia which serves as the oxidant.

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  A review of ammoniacal thiosulfate leaching of gold An

  This literature review provides an update of ammoniacal thiosulfate as a potential lixiviant of gold the history of thiosulfate leaching and recent progress on thiosulfate leaching of gold as well as the production oxidation and stabilization of thiosulfate. The leaching results of different types of gold ores including oxide sulfide carbonaceous and refractory ores/concentrates and the

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  A Novel Thiosulfate System for Leaching Gold Without the

  A Comparison of Cyanide and Thiosulfate Leaching for the Recovery of Gold from a Copper Containing Ore. Dai X. / Chu C. K. / Jeffrey M. / Breuer P. / TMS 2003. print version. 139 A Review of the Chemistry Electrochemistry and Kinetics of the Gold Thiosulfate Leaching Process. Breuer P. L. /

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  Biooxidation‒thiosulfate leaching of refractory gold

  2019-7-21 · A process of biooxidation followed by thiosulfate leaching of gold from refractory gold concentrate was investigated. Mineralogical studies on the concentrate showed that very fine gold grains (<10 μm) were encapsulated in pyrite and arsenopyrite while the proportion of monomer gold was only 21 . The gold-bearing sample was identified as a high-sulfur fine-sized wrapped-type refractory gold

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  Method for thiosulfate leaching of precious metal

  Li J. et al. "Important Solution Chemistry Factors That Influence the Copper-Catalyzed Ammonium Thiosulfate Leaching of Gold " Presented at the 125th SME Annual Meeting held in Phoenix Arizona Mar. 11-14 1996 pp. 1-20. Li J. et al. "Copper Catalyzed Ammoniacal Thiosulfate Leaching of Gold and Silver—Solution Chemistry " 34 pages.

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  US6632264B2Gold 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 an ion

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