Home--->of thiosulfate in gold leaching

  • Improvement of thiosulfate stability in gold leaching

    2003-5-1 · 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.

    A fundamental study of gold leaching in a thiosulfate

    2020-3-1 · Leaching tests using gold powder showed that the gold dissolution in a thiosulfate‑oxygen‑copper system in the absence of activated carbon was very slow, with only 2% gold dissolved over 24 h. In contrast, in the presence of activated carbon as an additive the gold leach recovery was dramatically improved to over 95% in the same period.

    THIOSULPHATE LEACHING AN ALTERNATIVE TO

    and greater efficiency with gold deposits associated with preg-robbing ores. The thiosulphate leaching process, followed by resin-in-pulp gold extraction, has been developed by SGS to the point where it is a technically and economically viable alternative to cyanidation for some gold bearing ore bodies. Whether the leaching is performed in

    Thiosulphate Stability In Gold Leaching Process

    2004-11-29 · Ammonium thiosulphate is an alternative gold leaching Laaviant used to replace cyanide. The current problem of thiosulphate gold leaching is the high reagent consumption, To understand the decomposition chemistry of thiosulphate, solution stability tests were conducted in open and sealed vessek mder ambient temperature

    Thiosulfate Leaching Process for Gold Extraction

    2017-2-20 · Thiosulfate leaching appears to be one of the most promising alternatives to cyanidation. 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

    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.

    Sodium Thiosulphate Gold Leaching 911 Metallurgist

    2016-6-2 · 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.

    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

    Anaerobic thiosulfate leaching: Development of in situ

    2008-5-1 · The focus of this work was to evaluate alternative oxidants for the in situ, thiosulfate leaching of gold. Emphasis was placed on evaluation of iron(III) based oxidants in anaerobic or low-oxygen environments, to simulate the oxygen conditions likely to be found in deposits such as the Victorian Deep Leads. 2. Experimental methods2.1.

    COMPARISON OF CYANIDE AND THIOSULPHATE

    2016-6-2 · Before leaching the gold, ore must be crushed and grinded into small particles, usually particle size varies between 30 and 180 μm. Free milling ores are ready for leaching after crushing and grinding whereas refractory ores need pretreatment. It is important to pretreat a refractory ore before leaching to achieve better gold extraction.

    (PDF) Thiosulfate leaching of gold—A review Mark

    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.

    Biooxidation-thiosulfate leaching of refractory gold

    2020-8-15 · 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

    FUNDAMENTAL ASPECTS OF GOLD LEACHING IN

    2020-7-24 · Figure 2.25 Mechanism of gold leaching in ATS system in the presence of copper ion (Ouyang, 2001) 42 Figure 2.26 The electrochemical model for the copper catalysis mechanism of leaching gold with ammoniacal thiosulfate.( Aylmore et al, 2001a) 43 Figure 2.27 The effect of pyridine on gold leaching in ATS-Cu system 45

    Thiosulphate leaching of gold in the presence of

    Improvement of thiosulfate stability in gold leaching. Minerals & Metallurgical Processing 20 (2), 68–72. Xu, Y., Schoonen, M.A.A., 1995. The stability of thiosulfate in the presence of pyrite in low-temperature aqueous solutions. Geochimica et Cosmochimica 45

    A study of thiosulfate leaching of gold from

    A comparison of thiosulfate with cyanide leaching of gold from carbonaceous ore showed that thiosulfate is chemically better and economically more advantageous. Description. Online access for this thesis was created in part with support from the Institute of Museum and Library Services (IMLS) administered by the Nevada State Library, Archives

    A Novel Thiosulfate System for Leaching Gold

    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. /

    Method for thiosulfate leaching of precious metal

    Where gold is the precious metal, thiosulfate leaching techniques have typically relied on the use of copper ions to catalyze and accelerate the oxidation of gold, ammonia to facilitate the formation and stabilization of cupric ammine ions and/or a pH at pH 9 or above to maintain a region of stability where both the cupric ammine and gold

    Barrick Thiosulfate Leaching of Double Refractory Ore

    2021-4-26 · The thiosulfate-gold complex formed in thiosulfate leaching is not attracted to carbon so this failure to remove the carbon is no longer an issue. Thus, the use of thiosulfate with autoclave-processed double refractory ores does not result in the loss of the gold complex in the tails.

    Associated Sulfide Minerals in Thiosulfate Leaching of

    2020-2-24 · The effects of some associated minerals on thiosulfate gold leaching were studied through thermodynamic analysis and leaching experiments on composite ore samples containing various minerals and a reference silicate gold ore. In the leaching test on the reference gold ore, about 93% of gold was extracted within 3.0 hours.

    Goldstrike TCM Leaching Ausenco

    Ausenco has been involved in Barrick’s gold processing operations at the Goldstrike Mine for nearly a decade. Goldstrike is Barrick’s largest and most productive mining operation, with gold production of more than 40 million ounces since 1987 It is located on the Carlin Trend, approximately 40 km north-west of Elko, Nevada, USA.

    Study on Gold Extraction from Thiosulfate

    2020-3-25 · thiosulfate, gold leaching system, ethylenediamine, leaching rate . Abstract: A gold mine in Myanmar is used as the research object in this paper. The thiosulfate-ethylenediamine-copper ion process conditions are discussed from the three aspects that affect the leaching effect: thiosulfate concentration, ethylenediamine

    FUNDAMENTAL ASPECTS OF GOLD LEACHING IN

    2020-7-24 · Figure 2.25 Mechanism of gold leaching in ATS system in the presence of copper ion (Ouyang, 2001) 42 Figure 2.26 The electrochemical model for the copper catalysis mechanism of leaching gold with ammoniacal thiosulfate.( Aylmore et al, 2001a) 43 Figure 2.27 The effect of pyridine on gold leaching in ATS-Cu system 45

    Thiosulphate leaching of gold in the presence of

    Improvement of thiosulfate stability in gold leaching. Minerals & Metallurgical Processing 20 (2), 68–72. Xu, Y., Schoonen, M.A.A., 1995. The stability of thiosulfate in the presence of pyrite in low-temperature aqueous solutions. Geochimica et Cosmochimica 45

    A study of thiosulfate leaching of gold from

    A comparison of thiosulfate with cyanide leaching of gold from carbonaceous ore showed that thiosulfate is chemically better and economically more advantageous. Description. Online access for this thesis was created in part with support from the Institute of Museum and Library Services (IMLS) administered by the Nevada State Library, Archives

    A Novel Thiosulfate System for Leaching Gold

    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. /

    Gold Leaching i n Thiosulfate Solutions a nd Its

    2017-2-20 · Gold leaching in thiosulfate solutions was evaluated environmentally and kinetically in different ways: (1) applying a closed system to leach gold (2) evaluating the environmental and metallurgical optimum thiosulfate leaching characteristics for pure gold and pure silver and gold silver alloys (4, 8, 20 and 50 wt

    Method for thiosulfate leaching of precious metal

    Where gold is the precious metal, thiosulfate leaching techniques have typically relied on the use of copper ions to catalyze and accelerate the oxidation of gold, ammonia to facilitate the formation and stabilization of cupric ammine ions and/or a pH at pH 9 or above to maintain a region of stability where both the cupric ammine and gold

    Study on oxygen pressure thiosulfate leaching of gold

    2019-5-13 · Study on oxygen pressure thiosulfate leaching of gold without the catalysis of copper and Hydrometallurgy ( IF 3.338) Pub Date : 2019-05-13, DOI: 10.1016/j.hydromet.2019.05.006 Yongbin Yang, Wei Gao, Bin Xu, Qian Li, Tao Jiang

    [PDF] Gold dissolution in non-ammoniacal

    Thiosulphate has received much attention as an alternative non-cyanide lixiviant for gold recovery over the last three decades. In particular, a number of studies have shown that an ammoniacal copper(II)/thiosulphate system offers fast leaching kinetics, but there are difficulties in controlling the complex solution chemistry and there are concerns over the use of ammonia.

    GOLD LECHING FROM A SAUDI ORE BY THE

    2014-9-8 · 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.

    FUNDAMENTAL ASPECTS OF GOLD LEACHING IN

    2020-7-24 · Figure 2.25 Mechanism of gold leaching in ATS system in the presence of copper ion (Ouyang, 2001) 42 Figure 2.26 The electrochemical model for the copper catalysis mechanism of leaching gold with ammoniacal thiosulfate.( Aylmore et al, 2001a) 43 Figure 2.27 The effect of pyridine on gold leaching in ATS-Cu system 45

    Gold leaching in thiosulfate solutions and its

    Gold and silver leaching in thiosulfate solution is preferable kinetically and environmentally if conducted in a closed vessel system.The effect silver alloyed with gold was evaluated and the result showed that the dissolution rate of pure gold is higher than that form 4 and 8 wt% Ag alloys. And the dissolution rate of gold from 20 and 50%

    FACTORS AFFECTING GOLD LEACHING IN

    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

    Thiosulfate Leaching of Middle-Refractory Gold Ore

    Leaching of middle-refractory gold ore show that both of the consumption of thiosulfate and leaching rate was decreased compare to the traditional copper–ammonia thiosulfate system. Thiourea is not stable in base solution, but it was found that gold dissolution rates can be increased with a little thiourea ,the mechanism is still unclear.

    (PDF) Thiosulfate leaching of gold from waste mobile

    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

    Effect of arsenopyrite on thiosulfate leaching of gold

    2015-10-29 · thiosulfate leaching of gold was unclear, especially on the chemical components of the coated layer on the gold surface. This study focused on the identification of species on the leached gold foil surface by X-ray photon spectroscopy (XPS) analysis, and further investigated the

    GOLD LECHING FROM A SAUDI ORE BY THE

    2014-9-8 · 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.

    Gold recovery from thiosulfate leaching The

    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

    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

    Kinetic studies of gold leaching from a gold concentrate

    2018-12-24 · The leaching of gold from a gold concentrate calcine using a novel thiosulfate leaching method that utilizes cobalt-ammonia complex as the oxidant in place of the traditional copper-ammonia catalysis was investigated. The result shows that the

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