Ammonia Gold Dissolution Leaching

2017-12-12 · Han and Meng (1993) carried out a detailed investigation on the dissolution kinetics of gold in ammoniacal media between 100°C and 200°C in an autoclave. The study revealed that the kinetics of gold dissolution in …

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Thermodynamic analysis of gold leaching by ammoniacal …

2001-11-1 · Thiosulfate offers a nontoxic alternative to cyanide for processing gold ores. The mechanism of leaching gold using ammoniacal thiosulfate solution is driven by the Cu(II)-Cu(I) redox couple and is complicated by competing ligands such as NH3 and S2O32−. It is shown that an understanding of the copper speciation and sulfur speciation is required to optimize this …

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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 extraction. In the present study, an attempt is made to assess the feasibility of ... Ammoniacal thiosulphate leaching of gold ore. 2003. Tsuyoshi Hirajima. Download Download PDF.

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Ammoniacal thiosulphate leaching of gold ore

2003-1-1 · The gold leaching is minimum in the presence of an inert gas such as nitrogen and the leaching increases in presence of other gases like oxygen …

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Thiosulfate leaching of gold

2001-2-1 · The ammoniacal thiosulfate leaching process for gold and silver extraction has been reviewed in terms of leaching mechanism, thermodynamics, thiosulfate stability, and gold recovery options. The ...

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Ammoniacal thiosulfate leaching of refractory oxide gold ore

2017-7-10 · Ammoniacal thiosulfate leaching of refractory oxide gold ore was investigated. According to X-ray fluorescence and fire assay analyses, the ore contained about 33.01 wt% Si, 8.53 wt% Al, 7.26 wt% K, 3.00 wt% Fe, and 2.80 ppm Au.Moreover, X-ray diffraction analysis and mineralogical studies using polished thin sections showed that the ore was composed of …

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Ammoniacal thiosulfate and sodium cyanide leaching of …

2020-12-17 · preg-robbing behavior of the parent ore. For carbonaceous matters from non-autoclaved ores, ammoniacal thiosulfate leaching only solubilized about 40% of the gold initially present in the carbonaceous matter, indicating that approximately 60% of the gold was encapsulated in sulfides. The percentage of gold leached by ammoniacal thiosulfate was ...

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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 thiosulfate, 0.02 M copper(II), 1.0 M ammonia, and 0.24 M sulfite. Under these conditions, a maximum gold leaching efficiency of 85.05% was obtained.

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Ammoniacal thiosulfate leaching of refractory oxide gold ore

Abstract Ammoniacal thiosulfate leaching of refractory oxide gold ore was investigated. According to X-ray fluorescence and fire assay analyses, the ore contained about 33.01 wt% Si, 8.53 wt% Al, 7.26 wt% K, 3.00 wt% Fe, and 2.80 ppm Au. Moreover, X-ray diffraction analysis and mineralogical studies using polished thin sections showed that the ore was composed of …

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Ammoniacal thiosulfate leaching of refractory oxide gold ore

2017-7-10 · The ammoniacal thiosulfate leaching of the ore was investigated as a function of time. The results are given in Fig. 7.As it is seen, the gold extraction increases with increase in time and attains 40% after 2 h leaching.The effective dissolution is achieved by a sufficient amount of thiosulfate concentration and none of ash layer around the particles.

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The role of ligands and oxidants in thiosulfate leaching …

2017-8-28 · have lead to investigations on non-ammoniacal thiosulfate processes. In the absence of added ammonia and copper(II) the thiosulfate leaching of gold has been carried out at high temperatures up to 80°C and at oxygen partial pressures up to 100 psig (19). For example, a carbonaceous ore of gold grade 9-10 Au g/t contained 81.8% of gold ...

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A Case Study on the Limited Gold Recovery from Non …

2022-5-7 · The POX process followed by thiosulfate gold leaching is expected to deliver high gold recovery through gold liberation from sulfides and elimination of preg-robbing behavior of carbonaceous matter. However, the alkaline POX discharge from Goldstrike mine, Nevada, USA, still suffers from low gold recovery in thiosulfate leaching.

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Sodium Thiosulfate Gold Leaching

2  · Polysulphide Ore by Ammoniacal Thiosulfate. A Review of Ammoniacal Thiosulfate Leaching of Gold An. Thiosulfate Leaching as an Alternative to Cyanidation. types of thiosulfate leaching of gold from ores. An Electrochemical and SERS Study of the Gold Thiosulfate. Thiosulphate Dropped Testing for PM Page 2 Gold. thiosulfate gold 4 / 45

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-【 ...

Leaching of Micro-disseminated Gold Ore Deposit in Guizhou by Thiosulfate PDF 3.46 g/t,,,、 ...

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[PDF] Gold and silver extraction by ammoniacal thiosulfate …

Abstract An investigation has been carried out to identify the parameters of importance in the dissolution of gold and silver values from an ore using ammoniacal thiosulfate solutions containing copper. The chemistry of the dissolution process has been analyzed through the construction of E H −pH diagrams. The experimental results show that it is possible to solubilize about 70% of …

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Gold and silver extraction by ammoniacal thiosulfate …

An investigation has been carried out to identify the parameters of importance in the dissolution of gold and silver values from an ore using ammoniacal thiosulfate solutions containing copper. The chemistry of the dissolution process has been analyzed through the construction of E H −pH diagrams. The experimental results show that it is possible to solubilize about 70% of silver …

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Gold Extraction by Ammoniacal Thiosulfate Leaching from ...

Abstract: An investigation has been carried out to identify the important parameters in the dissolution of gold from a gold ore containing copper using ammoniacal thiosulfate solution containing copper at room temperature,these parameters include thiosulfate (S 2O 2- 3),sulfite (SO 2- 3),copper ion (Cu 2+ ) and ammonia (as NH 4OH) concentration in leaching …

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Ammoniacal thiosulfate leaching of refractory oxide gold ore

AbstractAmmoniacal thiosulfate leaching of refractory oxide gold ore was investigated. According to X-ray fluorescence and fire assay analyses, the ore contained about 33.01wt% Si, 8.53wt% Al, 7.26wt% K, 3.00wt% Fe, and 2.80ppm Au.

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Ammoniacal thiosulfate leaching of gold from a …

The thiosulfate leaching tests (24 h) on the ground ore (-38 µm particle size, 25% w/w pulp density) were performed in glass reactors equipped with a …

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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 extraction. In the present study, an attempt is made to assess the feasibility of ammoniacal thiosulphate leaching of gold ore samples from two different mines namely Akeshi and Hishikari of Japan. In this study, the …

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Thiosulfate Leaching of the Auriferous Ore from Castromil …

Ammoniacal thiosulfate leaching is one of the most important alternatives to cyanidation. In this article, some experimental studies carried out in order to assess the feasibility of thiosulfate as a leaching agent for the ore from the unexploited Portuguese gold mine of Castromil. ... Yazici, Y., Deveci, H., Treatment of copper-rich gold ore ...

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(PDF) Ammoniacal thiosulfate leaching of gold …

2014-10-20 · A two-level full factorial design (23) was adopted to investigate the effects of concentration of thiosulfate (0.2-1 M Na2S2O3), ammonia (0.5-1 M NH3) and copper (0.05-0.1 M CuSO4) on the ...

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(PDF) Ammoniacal thiosulfate leaching of gold from a …

2014-10-20 · A two-level full factorial design (23) was adopted to investigate the effects of concentration of thiosulfate (0.2-1 M Na2S2O3), ammonia (0.5-1 M NH3) and copper (0.05-0.1 M CuSO4) on the ...

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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.

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Effect of Mechanical Activation on the Kinetics of …

Aazami et al. [27] investigated the effect of different additives on the thiosulfate leaching of gold from Zarshouran refractory gold ore and indicated that gold recovery and thiosulfate consumption in the presence of EDTA (ethylene diamine tetraacetic acid) are higher and lower than that achieved in the presence of ammonia, respectively.

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Thiosulfate leaching of gold

2001-2-1 · The ammoniacal thiosulfate leaching process for gold and silver extraction has been reviewed in terms of leaching mechanism, thermodynamics, thiosulfate stability, and gold recovery options. The application to different ore types and …

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Thiosulfate Leaching of Gold from Copper Bearing Ores

2018-5-26 · Thiourea leaching from an oxidized gold-copper ore with 90-95% gold extraction was also reported (McInnes et al., 1989). However, acid pre-leaching of soluble copper was required in order to reduce thiourea consumption to acceptable levels. Ammoniacal Thiosulfate Leaching. Ammonium thiosulfate has been used in photography for many decades.

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Gold and silver extraction by ammoniacal thiosulfate …

1988-1-1 · An investigation has been carried out to identify the parameters of importance in the dissolution of gold and silver values from an ore using ammoniacal thiosulfate solutions containing copper. The chemistry of the dissolution process has been analyzed through the construction of EH −pH diagrams. The experimental results show that it is ...

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Ammoniacal thiosulfate leaching of gold from a refractory …

Most studies have focused on thiosulfate leaching of free milling ores and, to some extent, pregrobbing ores. In this study, leaching of gold from the refractory Kaletas ore (in which gold/silver alloy is the only mode of occurrence detected) in …

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pressure conditions thiosulfate leaching of a refractory …

A case study on the limited gold recovery from non-ammoniacal thiosulfate leaching of a refractory gold ore oxidized in alkaline pressure conditions Sugyeong Lee, Farzaneh Sadri*, and Ahmad Ghahreman The Robert M. Buchan Department of Mining, Queen''s University, Kingston, ON, Canada K7L 3N6

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Leaching and Recovery of an Oxide Gold Concentrate …

2019-2-16 · Thiosulfate leaching-resin adsorption recovery, an environmentally friendly process, has been developed to efficiently extract gold from an oxide gold concentrate. 80.5% of gold extraction could be achieved by thiosulfate leaching under the conditions of (NH 4) 2 S 2 O 3 0.2 mol/L, CuSO 4 0.025 mol/L, NH 3 1.5 mol/L and leaching time 8 h, and the thiosulfate …

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Ammoniacal Thiosulphate Leaching of Gold Ore

2016-6-2 · by Alymore and Muir (2001) in which the chemistry and thermodynamics of ammoniacal thiosulphate leaching process of gold has been outlined. In the present study, an attempt is made to assess the feasibility of ammoniacal thiosulphate leaching of gold ore samples from two different mines namely Akeshi and Hishikari of Japan. In this study, the ...

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Ammonium thiosulfate complex of gold or silver and an …

1999-4-26 · It has now been found that by leaching the gold containing ore with an aqueous ammoniacal thiosulfate solution and extracting the metal values therefrom, a viable, practical process is provided, affording a simple means for avoiding the problem arising from the presence of other metals present with the precious metals in the aqueous ammoniacal ...

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Gold and silver extraction by ammoniacal thiosulfate …

T1 - Gold and silver extraction by ammoniacal thiosulfate leaching from a rhyolite ore. AU - Zipperian, D. AU - Raghavan, S. ... N2 - An investigation has been carried out to identify the parameters of importance in the dissolution of gold and silver values from an ore using ammoniacal thiosulfate solutions containing copper. The chemistry of ...

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Chapter 237: 2. Thiosulfate Leaching Chemistry

Early reports by Jeffrey and co-workers considered the fundamental kinetic and electrochemical aspects of gold and silver leaching with ammoniacal thiosulfate and compared alternative lixiviants such as cyanide and chloride/hypochlorite Breuer et al., Breuer and Jeffrey, Jeffrey, In general, the initial rate of leaching with 0.1 thiosulfate ...

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(PDF) Ammoniacal thiosulphate leaching of gold ore

Gold and silver extraction by ammoniacal thiosulfate

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A study of thiosulfate leaching of gold from carbonaceous …

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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AMMONIACAL THIOSULPHATE LEACHING OF A COPPER …

2011-1-1 · Thiosulfate leaching can be considered a non-toxic process, the gold dissolution rates can be faster than conventional cyanidation and, due …

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[PDF] A review of factors affecting gold leaching in non …

2018-6-1 · Semantic Scholar extracted view of "A review of factors affecting gold leaching in non-ammoniacal thiosulfate solutions including degradation and in-situ generation of thiosulfate" by O. Sitando et al. ... Leaching of gold from a free milling gold ore in copper-citrate-thiosulfate solutions at elevated temperatures. Jian Wang, F. Xie, W. Wang, ...

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The ammoniacal thiosulfate system for precious metal …

1995-12-31 · The hydrometallurgical treatment of gold and silver ores by ammoniacal thiosulfate solutions in the presence of a copper catalyst has been actively studied in recent years. Such a process strategy is very attractive due to the low toxicity of the lixiviant and the efficient recovery of the precious metals from difficult-to-treat ores. Important features of the ammoniacal …

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