ammonium thiosulfate gold leaching

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Ammoniacal thiosulphate leaching of gold ore & 0183;& 32;PDF 文件Ammoniacal thiosulphate leaching of gold ore R.K. Rath, N. Hiroyoshi, M. Tsunekawa*, T. Hirajima Laboratory of Mineral Processing and Resources Recycling, Graduate School of Engineering, Hokkaido University, Sapporo, 060-8628, Japan Received 30 November 2002; accepted 10 November 2003 ABSTRACT Ammoniacal thiosulphate leaching of gold finds a better substitute as it is non-toxic and ...

Ammonium thiosulfate extraction of gold from printed ... 01/01/2020 & 0183;& 32;Leaching of the metals from PCBs was investigated with varying solid-to-liquid ratio in ammonium thiosulfate solution. As illustrated in Fig. 3, the increase in solid-to-liquid ratio from 0.1 g to 1 g/10 ml resulted in the decrease of metal extraction. At the maximum solid-to-liquid ratio in the present study i.e., 1 g/10 ml , Au extraction was <5% due mainly to the lack of leaching reagent ...Cited by: 13

The treatment of copper–gold ores by ammonium … 01/10/2002 & 0183;& 32;In conclusion, ammonium thiosulfate leaching for gold recovery preferably should be performed at: low thiosulfate concentrations, ranging from 0.1 to 0.2 M; an ammonia to thiosulfate ratio of 1–2; copper concentrations ranging from 50 to 100 ppm; an alkaline pH, preferably 9–10; ambient temperature to 50 & 176;C. 2.3.Cited by: 126

Gold recovery from ammonia-thiosulfate leaching solution ... 01/11/2019 & 0183;& 32;Gold leaching in the ammoniacal thiosulfate system shows a complex dependence on the variation of the thiosulfate, copper and ammonia concentration in the solution. The concentration ratio of thiosulfate to ammonia should be maintained in a range of 0.5–1.0 Xu et al., 2017 in order to keep Cu II as Cu NH 3 4 2 in the appropriate solution concentration.Cited by: 2

Thiosulfate leaching of gold—A review - ScienceDirect 01/02/2001 & 0183;& 32;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 appli ion to different ore types and process options have also been discussed. The thiosulfate leaching process it alysed by copper and has several advantages over the …Cited by: 536

Gold Cementation from Ammonium Thiosulfate Solution by ... & 0183;& 32;PDF 文件Ammonium thiosulfate leaching is an alternative gold ex-traction method to cyanidation because of its low toxicity.1–7 However, the gold recovery method from the leach solution was not widely studied. In our study of gold leaching,8 an optimum condition to extract gold from Hishikari ore was de-veloped. In this paper, the cementation method to recover gold from the leach solution is ...

THIOSULPHATE LEACHING – AN ALTERNATIVE TO CYANIDATION … & 0183;& 32;PDF 文件 The thiosulphate leaching of gold ores has great potential to reduce the impact on the environment compared to the cyanidation process. Unlike cyanide, which is highly toxic, the chemicals used in the thiosulphate leaching process are benign, and there is great potential to apply the technology in those jurisdictions of the world where the use of cyanide is banned outright, or is subject ...文件大小: 414KB

The treatment of copper–gold ores by ammonium … The appli ion of ammonium thiosulfate for the treatment of copper–gold ores has been investigated. Copper minerals and copper–gold samples were leached in an ammonium thiosulfate solution under varying experimental conditions, i.e. aeration, temperature and reagent addition. The behaviour of thiosulfate, tetrathionate and sulfate in solution was studied using ion chromatography ...Cited by: 126

Thiosulphate Leaching SGS Thiosulfate leaching is particularly well suited to state-of-the-art resin-in-pulp RIP gold recovery technologies Thiosulfate leaching is an alkaline process usually operated in the pH 8 to 10 range so there are no concerns with corrosion of equipment in the recovery operation ; The main chemical components of the thiosulfate leaching process ammonium thiosulfate and ammonium sulphate ...

The role of ligands and oxidants in thiosulfate leaching ... & 0183;& 32;PDF 文件gold metal from leach liquor by adding ammonium sulphide 34 . Although a low gold recovery of 82-83% was achieved in non-ammoniacal thiosulfate at elevated temperatures and oxygen partial pressures 19 , a recent study has shown the possible appli ion of iron III -EDTA-thiosulfate-thiourea as a leaching agent for gold, to achieve a much higher gold extraction > 90% under ambient leaching ...Cited by: 73

Leaching gold by reactive flow of ammonium thiosulfate … Here, we present a study of gold leaching, where the gold layer is removed from a microchannel wall within a high aspect ratio channel 8 μm & 215; 4 mm cross-section; 1:500 . The etchant is an aqueous solution of sodium thiosulfate, ammonium hydroxide, and copper sulfate.

THE STUDY OF THE KINETICS OF GOLD LEACHING IN THE AMMONIUM THIOSULFATE … & 0183;& 32;PDF 文件The gold leaching rate in ammonium thiosulfate in the presence of copper species is mainly controlled by the hodic process, which is under diffusion or mixed kinetics control. The results of the rotating gold disk leaching study are consistent with those from ...

Interference of coexisting copper and aluminum on the … Ammonium thiosulfate solution is an ideal lixiviant to extract gold Au from electronic wastes E-wastes because it is non-toxic, less corrosive, and more selective than conventional cyanide or halide solutions. It was reported recently, however, that Au leaching

The treatment of copper-gold ores by ammonium … The appli ion of ammonium thiosulfate for the treatment of copper-gold ores has been investigated. Leaching studies were conducted with copper minerals, copper minerals with gold addition to solution and copper-gold samples of different copper and gold grades. The behaviour of thiosulfate, tetrathionate and sulfate in solution was studied using ion chromatography. The copper sulfide minerals ...

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. Dissolved ...

Gold Cementation from Ammonium Thiosulfate Solution by Zinc, … & 0183;& 32;PDF 文件Keywords: gold, zinc, copper, aluminium, thiosulfate, cementation 1. Introduction Ammonium thiosulfate leaching is an alternative gold ex-traction method to cyanidation because of its low toxicity.1–7 However, the gold recovery method from the leach solution 8

Importance of Solution Chemistry for Thiosulphate … Gold recovery by alytic copper ammonium thiosulphate solution has been studied. Such a process strategy is very attractive for leaching certain difficult-to-treat ores and presents lessened lixiviant toxicity compared to cyanide. Newmont Gold Company has evaluated the ammonium thiosulphate heap leach process for gold recovery from low- grade carbonaceous sulphidic refractory ores following ...

Using Nickel as a alyst in Ammonium Thiosulfate … For extracting gold from the copper bearing sulfide ore, a higher ammonia and thiosulfate concentrations were required with 0.0001 mol/dm 3 of Ni 2 . The ammonium thiuosulfate consumption with nickel as alyst on the copper bearing sulfide ore was about 1∼5 kg/t-ore less than that using copper as alyst.

US6632264B2 - Gold recovery from thiosulfate leaching - … Processes for recovering gold from copper-gold ores thiosulfate leaching or gold ores copper alyzed thiosulfate leaching using ion exchange technology are disclosed. The processes include subjecting the gold-bearing and copper-bearing thiosulfate solution to a ...

Ammonium thiosulfate - Wikipedia Ammonium thiosulfate ammonium thiosulphate in British English is an inorganic compound with the formula NH 4 2 S 2 O 3.It is white crystalline solid with ammonia odor, readily soluble in water, slightly soluble in acetone and insoluble in ethanol and diethyl ether. ...Production & 0183;& 32;Appli ions & 0183;& 32;Safety & 0183;& 32;See also & 0183;& 32;References

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.

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, hodic polarization and leaching experiments were included in this study. The effect of concentration of different reagents, applied potential, pH, temperature, and electrode rotating ...

The role of amino acids in the thiosulphate leaching of gold & 0183;& 32; Ammonium thiosulfate is a noncyanide lixiviant for gold leaching. However, the major problem with this leaching method has been the high consumption of reagents.

Ammonium thiosulphate H8N2O3S2 - PubChem & 0183;& 32; Ammonium thiosulfate is an inorganic ammonium salt composed of ammonium and thiosulfate ions in a 2:1 ratio. It is used in the leaching of gold and silver, as a fertilizer and as a photographic fixing salt.It has a role as a fertilizer, a herbicide safener, a bleaching agent and a reducing agent.

Leaching of Gold from the Waste Mobile Phone Printed ... Jan 02, 2012 & 0183;& 32;A leaching of 56.7% gold was obtained under the optimum condition of 0.1M ammonium thiosulfate, 40 mM copper sulfate, pH: 10-10.5, pulp density: 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 thiosulfate.

Ammonium Thiosulfate Heap Leaching - Technische ... A Novel Thiosulfate System for Leaching Gold Without the Use of Copper and Ammonia Ji, J. / Fleming, C. / West-Sells, P. G. / Hackl, R. P. / TMS 2003 print version

Ammonium thiosulfate complex of gold or silver and an ... Ammonium thiosulfate complex of gold or silver and an amine . United States Patent 6197214 . Abstract: The process of recovering precious metals from ores containing precious metals, such as gold and silver, from an aqueous ammoniacal thiosulfate leach solution to provide a significant practical and economical process for the recovery of gold ...

The Extraction of Gold from E-waste by Hydrometallurgy ... In other words, less than 2 % of the gold remained in the gold leach solution. Then, the organic phase, which is charged with 2 M ammonium hydroxide solution and 0.5 M sodium thiosulfate, was transferred. The results were not positive, and 3.13 and 15.26 % of gold was transferred from organic to …

Method for thiosulfate leaching of precious metal ... Li, J. et al.; “Important Solution Chemistry Factors That Influence the Copper- alyzed 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 alyzed Ammoniacal Thiosulfate Leaching of Gold and Silver—Solution Chemistry,” 34 pages.

Using Nickel as a alyst in Ammonium Thiosulfate ... On a 100 mass%-75 μm of sili e type gold ore containing 16 g/t Au and 0.2 mass% of Fe and C, the nickel alyzed ammonium thiosulfate solution could extract 95% of gold with the 1.2 kg/t-ore of ammonium thiosulfate consumption in 24 hours at the most favorable reagent combination of 0.0001 mol/dm 3 NiSO 4, 0.05 mol/dm 3 NH 4 2 S 2 O 3 and ...

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 ...

PDF A Review of Thiosulfate Leaching of Gold: Focus on ... & 0183;& 32; Using nickel as a alyst in ammonium thiosulfate leaching for gold . extraction. Mater. T rans. 2004, 45, 516–526. 45.

Leaching gold by reactive flow of ammonium thiosulfate ... Here, we present a study of gold leaching, where the gold layer is removed from a microchannel wall within a high aspect ratio channel 8 μm & 215; 4 mm cross-section; 1:500 . The etchant is an aqueous solution of sodium thiosulfate, ammonium hydroxide, and copper sulfate.

Importance of Solution Chemistry for Thiosulphate Leaching ... Gold recovery by alytic copper ammonium thiosulphate solution has been studied. Such a process strategy is very attractive for leaching certain difficult-to-treat ores and presents lessened lixiviant toxicity compared to cyanide. Newmont Gold Company has evaluated the ammonium thiosulphate heap leach process for gold recovery from low- grade carbonaceous sulphidic refractory ores following ...

THE STUDY OF THE KINETICS OF GOLD LEACHING IN THE AMMONIUM THIOSULFATE … & 0183;& 32;PDF 文件The kinetics of gold leaching in ammonium thiosulfate solution in the presence of copper have been studied by electrochemical polarization and direct rotating disk leaching methods. The effects of pH, temperature, rotating velocity and the concentrations of different reagents on the gold leaching rate have been investigated. It was found that the anodic oxidation of gold in ammonium thiosulfate solution is …

Leaching of Gold from the Waste Mobile Phone Printed Circuit Boards ... & 0183;& 32;PDF 文件02/01/2012 & 0183;& 32;56.7% gold was obtained under the optimum condition of 0.1M ammonium thiosulfate, 40 mM copper sulfate, pH: 10-10.5, pulp density: 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 thiosulfate. The decomposition ...

GOLD LECHING FROM A SAUDI ORE BY THE NONPOLLUTING THIOSULFATE … & 0183;& 32;PDF 文件of CIL feed, almost 70% of gold could be extracted at 0.2 M ammonium thiosulfate and 0.3 M ammonium hydroxide after 24 h. Addition of copper II as <0.2 mM only slightly enhanced the gold 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, …

PDF Leaching of Gold from Mobile Phone Manoj Kumar … The maximum leaching was ules for gold Ammonium thiosulfate: 0.1 M, copper sulfate: 40 mM, pH: 10 56.7% gold at leaching conditions i.e. copper sulfate: 40mM, – 10.5, temp.: 25℃, time: 8h, soild/liquid ratio: 40 g/L ammonium thiosulfate: 0.1M, pH: 10-10.5, temperature: 25℃, stirring speed: 250 rpm in time 8 h at a pulp density of 10 g/L. The lower pulp density has been found to be benefi- 5. Conclusions …

DISSOLUTION OF GOLD WITH CYANIDE REPLACING REAGENTS & 0183;& 32;PDF 文件Keywords: gold leaching, ammonium thiosulfate, chloride, thiourea, thiocyanate Introduction The most common hydrometallurgical methods of primary Seven Trust material utilization in the production of gold are based on the use of cyanide Hilson, 2006 . In this method a weak sodium cyanide solution NaCN of 100-500 ppm is used. Since the Baia Mare disaster in Romania in January 2000, the use of cyanide has …

Factors affecting gold leaching in thiosulfate-O2 solutions … 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 …

Thiosulfate Leaching Process for Gold Extraction & 0183;& 32;PDF 文件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 adsorption of the species in resin-solution are also needed, which can be developed using …

Study on Gold Extraction from Thiosulfate-Ethylenediamine … & 0183;& 32;PDF 文件25/03/2020 & 0183;& 32;95%, ammonium thiosulfate concentration is selected as 0.3mol/L, copper ion concentration is selected as 0.005mol/L, ethylenediamine concentration is selected as 0.06mol/L, and the pH value is adjusted to bout 10, liquid to solid mass ratio of 3:a 1, stirring and leaching at room temperature for h, on this basis, the gold leaching rate 7 is 81.05%. 1. Introduction . Thiosulfate is one …

Ammonium thiosulfate complex of gold or silver and an … Where metals other than gold and silver are extracted with the ammoniacal thiosulfate leach solution, such as copper and zinc, such metal values, which may be present as an ammonium complex, and may be selectively extracted from the aqueous solution either before or after the extraction of the precious metal values as discussed above. These metals may be selectively removed by extraction with reagent …

Micromechanism Study of Strengthening Effect of Copper … The treatment of copper-gold ores by ammonium thiosulfate leaching. Molleman, Ellen; Dreisinger, David. Hydrometallurgy 2002 , 66 1-3 , 1-21 CODEN: HYDRDA; ISSN: 0304-386X. Elsevier Science B.V. The appli ion of ammonium thiosulfate to the treatment of copper-gold ores has been investigated. Copper minerals and copper-gold samples were leached in an ammonium thiosulfate soln. under varying …

Thiosulphate Stability In Gold Leaching Process & 0183;& 32;PDF 文件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 ...

Ammonium Thiosulfate Heap Leaching - Technische … A Novel Thiosulfate System for Leaching Gold Without the Use of Copper and Ammonia Ji, J. / Fleming, C. / West-Sells, P. G. / Hackl, R. P. / TMS 2003 print version

Interference of coexisting copper and aluminum on the … Ammonium thiosulfate solution is an ideal lixiviant to extract gold Au from electronic wastes E-wastes because it is non-toxic, less corrosive, and more selective than conventional cyanide or halide solutions. It was reported recently, however, that Au leaching ...

Effect of pyrite on thiosulfate leaching of gold and the … The effect of pyrite and the role of ammonium alcohol polyvinyl phosphate AAPP during gold leaching in ammoniacal thiosulfate solutions were investigated using pure gold foils. The results showed that pyrite alyzed the decomposition and also significantly ...

GOLD RECOVERY FROM PRINTED CIRCUIT BOARDS OF MOBILE PHONES SCRAPS USING A LEACHING … & 0183;& 32;PDF 文件Gold Recovery from Printed Circuit Boards of Mobile Phones Scraps Using a Leaching Solution Alternative to Cyanide 935 Leaching tests with sodium and ammonium thiosulfate In this work, different concentrations of thiosulfate,

FACTORS AFFECTING GOLD LEACHING IN THIOSULFATE … 28/1/2021 & 0183;& 32;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 ...

1-Ammonium Thiosulfate Ecological Viable Alternative to Replace Sodium Cyanide in Gold … & 0183;& 32;PDF 文件Ammonium Thiosulfate Ecological Viable Alternative to Replace Sodium Cyanide in Gold and Silver Dissolution Ores 225 nitrate and oxalic acid, respectively, using phenolphthalein as an indi or in the case of CaO. To facilitate the process, the solutions were

The Extraction of Gold from E-waste by … By increasing 48 mm copper sulfate, a 30-% increase in gold extraction can be expected, and its alytic role in ammonium thiosulfate can be recognized ,Abdollahi , et al. To dissolve the gold in the copper anode sludge screened process, it was leached into aqua regia, and more than 99 % of the gold solution entered aqueous phase together with impurities.

Eco-friendly Gold Leaching Reagents, Gold Dressing … The characteristics of using thiosulfate as a gold recovery chemicals are: 1 non-toxic, 2 fast leaching speed, generally only takes 3 hours to achieve the best economic effect, 3 can process refractory gold ores containing copper, arsenic, antimony, selenium

Micromechanism Study of Strengthening Effect of Copper … To study the effect of copper on gold thiosulfate leaching, the gold dissolution of three different sample powders gold, gold/copper, and gold/copper oxide in a solution of 5 mM Cu2 , 0.4 M ammonia, and 0.1 M thiosulfate was studied. Scanning electron microscopy analysis showed no sulfur passivation on the gold surface, and there were more prominent corrosion pits on the gold surfaces of ...

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