Thiosulfate Leaching Of Gold

  • 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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  • What are the Cyanide-Free Gold Recovery Methods?

    In the kinetic study of thiosulfate gold leaching, it is revealed that copper and ammonia have catalytic effects in the gold leaching process. This cyanide-free gold recovery method has high leaching rate and low toxicity. However, the thiosulfate system has poor thermal stability, high leaching agent consumption, and narrow range of allowable ...

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  • (PDF) Thiosulphate leaching for gold hydrometallurgy ...

    The thiosulphate concentration was determined by iodometric titration. The pH of the pulp ranged from 8.5 to 10.5.Adsorption studies were carried out with the actual ammoniacal thiosulphate solution coming from the leaching of the gold ore sample. The gold concentration of the solution was in the range from 2 mg/l to 16.60 mg/1 and the pH was 10.5.

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  • Sodium Thiosulphate Gold Leaching

    The gold industry has been seeking alternative reagents for leaching gold from low-grade ores for the past 25 years. The cost and transport of cyanide, the poor recovery of gold from carbonaceous ores, the lack of selectivity of cyanide towards copper minerals and the cost of waste treatment are real factors which can make cyanide unattractive in some circumstances. …

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  • (PDF) Thiosulfate leaching of gold from waste mobile phones | …

    Thiosulfate leaching of gold from waste mobile phones Ha V.H., Lee J.-C., Jeong J., Hai H.T., Jha M.K. Institute for Environmental Science and Technology, Hanoi University of Technology (HUT), 1 - Dai Co Viet, Hanoi, Viet Nam; Mineral Resources Research Division, Korea Institute of Geoscience and Mineral Resources (KIGAM), 92, Gwahang-no, Yuseong-gu, Daejeon 305-350, South Korea; Metal ...

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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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  • Thiosulfate leaching of gold—A review - ScienceDirect

    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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  • WO2005017215A1 - Improved thiosulphate leach process ...

    An improved thiosulphate leach process for the recovery of gold from ores and other gold-bearing materials, characterised in that the leach solution comprises thiosulphate, thiourea or a reagent chemically related thereto, and an oxidant that does not oxidise thiosulphate, the process producing a pregnant leach solution from which gold may be recovered.

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  • A Method for Leaching or Dissolving Gold from Ores or ...

    lurgical gold extraction routes utilize a leaching step to produce a gold-bearing solution as an intermediate product while the recycling of secondary gold from electronic and precious metal scrap is based on the selective and fast dissolu-tion of the precious metal. Therefore, A Method for Leaching or Dissolving Gold from Ores or Precious

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  • Leaching Kinetics of Gold Involved in the System S2O32 ...

    Abstract: Thiosulphate gold leaching is an alternative technology to the cyanidation of gold ores. Ethylenediaminetetraacetic acid is referred to as EDTA.A study on the leaching kinetics of gold involved in the system S 2 O 3 2--EDTA-Cu 2+ for the gold in this paper. The effect of temperature and of the addition of copper has been also analyzed, temperature has a …

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  • 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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  • 4 Reasons and Solutions of Poor Gold Leaching Effect

    Therefore, during cyanide leaching process, it is difficult for the cyanide solution to contact with gold mineral, so the gold leaching rate is often low. Solution After reaching a certain degree of monomer dissociation, for gold ores with low arsenic content, aqueous solution oxidation, aqueous chlorination, bacterial oxidation, etc. can be used.

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  • Leaching and recovery of cold in thiosulfate based system ...

    Research at ICM on gold leaching and recovery related to thiosulfate system is briefed. Ammonia was found to promote the thiosulfate leaching of gold by preferential adsorption on the gold surface and dissolution of gold as an auroammine intermediate which then converts into thiosulfate complex.

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  • Thiosulphate Leaching | SGS China

    Thiosulfate leaching offers a number of benefits related to gold recovery yields and environmental concerns: Thiosulfate leaching of gold ores has great potential to reduce the impact on the environment. Unlike cyanide, which is highly toxic, the chemicals used in the thiosulfate leaching process are benign.

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  • The role of ligands and oxidants in thiosulfate leaching ...

    The complexity of thiosulfate leaching of gold is exemplified in Figure 1 (14). It shows that sulfite, sulfide, sulfate glycine and ethylenediaminetetracetic acid (EDTA) have beneficial effects on gold extraction, compared to standard thiosulfate leaching with 0.03 M copper sulfate,

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  • Gold strike with thiosulphate - CSIRO

    As part of the thiosulphate process at Goldstrike, gold-bearing ore is heated as a thick slurry of ore, air, water and limestone in large pressure chambers or autoclaves and then pumped into the new ‘resin-in-leach’ circuit that takes place inside large stainless steel tanks.

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  • (PDF) Thiosulphate leaching for gold hydrometallurgy | Stefano …

    The thiosulphate concentration was determined by iodometric titration. The pH of the pulp ranged from 8.5 to 10.5.Adsorption studies were carried out with the actual ammoniacal thiosulphate solution coming from the leaching of the gold ore sample. The gold concentration of the solution was in the range from 2 mg/l to 16.60 mg/1 and the pH was 10.5.

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  • Improvement of thiosulfate stability in gold leaching - Mining, …

    Abstract 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 (NH 4) 2 S 2 O 3, 0.03M CuSO 4 and 3M NH 3 at pH 10.2 for 24 hours.

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  • Micromechanism Study of Strengthening Effect of Copper on Gold Thiosulfate Leaching …

    The gold dissoln. rate of the gold ore could reach 94.3% and the thiosulfate consumption could be reduced to 1.12 kg/t ore in the thiosulfate gold leaching system contg. 0.1 mol/L of sodium thiosulfate, 0.06 M ethanediamine, 0.005 M copper ion and 1.5 kg/t of CTAB and operated at a …

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  • Gold Leaching by Thiosulfate Solution and Recovery

    Jan 01, 2003· "In this investigation, a sponge gold sample (99.92% pure) has been leached with ammonium thiosulfate solution. The effects of CuSO4, (NH4)2S2O3, (NH4)2SO4, NH4OH and retention time on the gold leaching % (extraction %) and thiosulfate oxidation % (consumption %) have been studied. The copper ion acts as a catalyst in gold dissolution.

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  • Gold strike with thiosulphate - MINING.COM

    Jun 19, 2015· The CSIRO-patented cyanide-free thiosulphate process is adding value to Barrick Gold Corporation‘s gold operation. The first gold bar produced with the thiosulphate process was poured in late ...

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  • GOLD LECHING FROM A SAUDI ORE BY THE NONPOLLUTING …

    leaching in the ammoniacal thiosulfate solution. Gold leaching drastically decreased as the concentration of copper(II) increased 0.2 mM due to the degradation of S 2 O 3 2-. Keywords: gold, extraction, leaching, thiosulfate, Saudi ore Introduction Gold dissolution in an alkaline cyanide solution was first reported by Elsner in 1846.

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  • Goldstrike TCM Leaching | Ausenco

    Successful gold production uses patented thiosulfate processing method Project Goldstrike TCM Leach Project. Location Elko, Nevada, United States . Timeframe 2011 - 2015. Client ... involved a $620 million investment that included major upgrades to the Goldstrike leaching circuits and …

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  • thiosulfate leach of gold plate - YouTube

    Feb 24, 2014· recovered powders from a sodium thiosulfate leach of gold plated pins. if all my experiments can be perfected, i will have a safe, non-toxic process to remov...

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  • Leaching of Gold from the Waste Mobile Phone Printed Circuit Boards (PCBs) with Ammonium Thiosulphate …

    A leaching of 56.7% gold was obtained under the optimum conditions of 0.JM ammonium thio-sulphate, 40 mM copper sulphate, pH.- 10-10.5, pulp den-sity: 10 g/L at room temperature and stirring speed of 250 rpm in 8h duration. The maximum leaching of gold in the pH range 10-10.5 may be attributed to the higher stability of the ammonium thiosulphate.

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  • Leaching of gold and silver from printed circuit board of ...

    The results for leaching gold with alternative reagents, sodium thiosulfate and ammonium hydroxide, show that the best extraction was achieved at 0.1M sodium thiosulfate and 0.2M ammonium hydroxide, when adding 0.1M of hydrogen peroxide as an oxidation agent, obtaining approximately 11% of gold.

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  • THIOSULPHATE LEACHING – AN ALTERNATIVE TO …

    equivalent rates of gold leaching, and a typical thiosulphate leach solution will have a reagent concentration of 5 to 20 g/L versus a cyanide concentration of only 0.25 to 1 g/L. The higher concentration of thiosulphate required leads to higher reagent consumption, which is at least .

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  • Leaching of Gold from the Waste Mobile Phone Printed ...

    A leaching of 56.7% gold was obtained under the optimum conditions of 0.JM ammonium thio-sulphate, 40 mM copper sulphate, pH.- 10-10.5, pulp den-sity: 10 g/L at room temperature and stirring speed of 250 rpm in 8h duration. The maximum leaching of gold in the pH range 10-10.5 may be attributed to the higher stability of the ammonium thiosulphate.

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  • (PDF) Ammoniacal thiosulphate leaching of gold ore

    Ammoniacal thiosulphate leaching of gold finds a better substitute as it is non-toxic and environmentally safe as compared to the toxic cyanide system for gold …

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  • Biooxidation‒thiosulfate leaching of refractory gold ...

    Jul 21, 2019· The gold leaching efficiency of this biooxidation‒thiosulfate process increased by 25.2% and 56.5% compared with those of direct cyanidation and direct thiosulfate leaching of the concentrate. Biooxidation pretreatment followed by ammoniacal thiosulfate leaching technology is highly suitable for gold extraction from high-sulfur fine-sized ...

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