thiosulfate gold leaching

Thiosulfate leaching of gold—A review - ScienceDirect

2001-2-1  Thiosulfate is considered a non-toxic alternative to cyanide and can leach gold faster than cyanide. In the conventional cyanide process, the recovery of gold and silver from ores is hindered by a variety of metal impurities like copper, arsenic, antimony, zinc and nickel, since these consume either cyanide or oxygen.

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THIOSULPHATE LEACHING – AN ALTERNATIVE TO

Thiosulphate leaching is a process that removes gold from gold bearing ores without the use of cyanide. Although not as aggressive a leaching agent as cyanide, thiosulphate offers several technological advantages including its lower toxicity 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

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Sodium Thiosulphate Gold Leaching

2016-6-2  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 ...

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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

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Thiosulphate Leaching SGS

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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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

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Biooxidation‒thiosulfate leaching of refractory gold ...

2019-7-21  Ammoniacal thiosulfate was used for gold extraction from the biooxidation residue of the refractory gold concentrate. The results showed that the optimal reagent conditions were 0.18 M

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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

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Thiosulphate Stability In Gold Leaching Process

2016-6-2  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

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The ultrasound leaching kinetics of gold in the ...

2020-9-1  The leaching of thiosulfate requires oxidant to speed up the leaching process, which results in high consumption of thiosulfate. Copper is one of the most commonly used oxidants in the thiosulfate leaching process because it can significantly accelerate gold dissolution (Xia et al., 2003; Senanayake, 2010; Senanayake and Zhang, 2012).

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Thiosulphate Leaching SGS

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.

More

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

More

Thiosulphate Stability In Gold Leaching Process

2016-6-2  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

More

(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.

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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 ...

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© University of Science and Technology Beijing and ...

2021-4-27  Thiosulfate is not only cheap and non-toxic, but also can form stable gold complexes. It is also suitable for leaching typical oxidized gold ores [8]. With the leaching of certain sulfide minerals with thiosulfate, however, previous studies have shown that while a large amount of thiosulfate is consumed, only a poor leaching rate is obtained.

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Selective Electrochemical Gold Recovery from

2017-5-3  The electro-recovery of gold from thiosulfate leaching systems was evaluated on Pt electrode using S3 solution with a gold concentration of 0.0014 mol L −1 (27.4 mg of dissolved gold). In Figure 5 the characteristic oxidation Cu/Cu(I)/Cu(II) and reduction Cu(II)/Cu(I)/Cu peaks discussed in the previous results are observed.

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Gold recovery from refractory gold concentrates by ...

2019-3-1  that gold recovery is difficult by thiosulfate leaching without any pre-treatment, and the recovery of gold only is 10.1%. After roasting and oxidizing, the gold leaching rate increases substantially. The leaching rate of gold reaches 71.2% with the optimal leaching technological parameters (Li et al.,

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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.

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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

More

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

More

Thiosulfate degradation during gold leaching in

Thiosulfate has shown considerable promise as an alternative to cyanide for gold leaching. However, one of the main limitations of the thiosulfate system is the high consumption of thiosulfate. Besides increasing the cost of the process, the degradation products of thiosulfate have been claimed to passivate gold surfaces and the polythionates often produced are loaded onto resins proposed for ...

More

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 ...

More

Factors affecting gold leaching in thiosulfate-O2

2013-5-30  ALTA 2013 Gold Conference, Perth, WA, Australia, 25 May - 1 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.

More

© University of Science and Technology Beijing and ...

2021-4-27  Thiosulfate is not only cheap and non-toxic, but also can form stable gold complexes. It is also suitable for leaching typical oxidized gold ores [8]. With the leaching of certain sulfide minerals with thiosulfate, however, previous studies have shown that while a large amount of thiosulfate is consumed, only a poor leaching rate is obtained.

More

Selective Electrochemical Gold Recovery from

2017-5-3  The electro-recovery of gold from thiosulfate leaching systems was evaluated on Pt electrode using S3 solution with a gold concentration of 0.0014 mol L −1 (27.4 mg of dissolved gold). In Figure 5 the characteristic oxidation Cu/Cu(I)/Cu(II) and reduction Cu(II)/Cu(I)/Cu peaks discussed in the previous results are observed.

More

金矿非氰化浸金研究进展 - USTB

2020-11-15  Liu X L, Xu B, Yang Y B, et al. Effect of galena on thiosulfate leaching of gold. Hydrometallurgy, 2017, 171: 157 doi: 10.1016/j.hydromet.2017.05.011 [14] Yang Y B, Gao W, Xu B, et al. Study on oxygen pressure thiosulfate leaching of gold without the catalysis

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Gold recovery from refractory gold concentrates by ...

2019-3-1  that gold recovery is difficult by thiosulfate leaching without any pre-treatment, and the recovery of gold only is 10.1%. After roasting and oxidizing, the gold leaching rate increases substantially. The leaching rate of gold reaches 71.2% with the optimal leaching technological parameters (Li et al.,

More

Cyanide alternative leaching reagents for gold recovery ...

2019-7-31  an efficient gold recovery via thiosulfate leaching requires a strict process control, which is hardly manageable when a complex input material like crushed e-waste is used. In superficial leaching ex-periments of holistic RAM’s a formation of a passive layer was observed, which hindered or slowed ...

More

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

More

Thiosulphate Leaching SGS China

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.

More

Thiosulfate degradation during gold leaching in

Thiosulfate has shown considerable promise as an alternative to cyanide for gold leaching. However, one of the main limitations of the thiosulfate system is the high consumption of thiosulfate. Besides increasing the cost of the process, the degradation products of thiosulfate have been claimed to passivate gold surfaces and the polythionates often produced are loaded onto resins proposed for ...

More

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 ...

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Factors affecting gold leaching in thiosulfate-O2

2013-5-30  ALTA 2013 Gold Conference, Perth, WA, Australia, 25 May - 1 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.

More

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

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Selective Electrochemical Gold Recovery from

2017-5-3  The electro-recovery of gold from thiosulfate leaching systems was evaluated on Pt electrode using S3 solution with a gold concentration of 0.0014 mol L −1 (27.4 mg of dissolved gold). In Figure 5 the characteristic oxidation Cu/Cu(I)/Cu(II) and reduction Cu(II)/Cu(I)/Cu peaks discussed in the previous results are observed.

More

金矿非氰化浸金研究进展 - USTB

2020-11-15  Liu X L, Xu B, Yang Y B, et al. Effect of galena on thiosulfate leaching of gold. Hydrometallurgy, 2017, 171: 157 doi: 10.1016/j.hydromet.2017.05.011 [14] Yang Y B, Gao W, Xu B, et al. Study on oxygen pressure thiosulfate leaching of gold without the catalysis

More

Gold recovery from refractory gold concentrates by ...

2019-3-1  that gold recovery is difficult by thiosulfate leaching without any pre-treatment, and the recovery of gold only is 10.1%. After roasting and oxidizing, the gold leaching rate increases substantially. The leaching rate of gold reaches 71.2% with the optimal leaching technological parameters (Li et al.,

More

Cyanide alternative leaching reagents for gold recovery ...

2019-7-31  an efficient gold recovery via thiosulfate leaching requires a strict process control, which is hardly manageable when a complex input material like crushed e-waste is used. In superficial leaching ex-periments of holistic RAM’s a formation of a passive layer was observed, which hindered or slowed ...

More