Abstract. 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 process options have also been discussed. The thiosulfate leaching process it …
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The application of pressure oxidation (POX) followed by thiosulfate gold leaching is an efficient method used to extract gold from double refractory gold ores containing both sulfide and carbonaceous matter. This process is expected to result in high gold recovery rates, as it liberates gold from sulfides and eliminates the preg-robbing …
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Abstract: Thiosulfate leaching is a promising alternative to cyanidation, and the main hindrances for its wide commercial application are the high thiosulfate consumption and the difficult ...
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A certain amount of sodium sulfite was added to the initial fresh leaching and cyclic leaching of thiosulfate barren solution. On the one hand, thiosulfate can be prevented from decomposing into sulfite and sulfur; on the other hand, it can promote the decomposition of polysulfate and reduce the loss of S 2 O 3 2− [ 9 ].
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For instance, a solution of 1 or 2%, of sodium hyposulphite, 3/4%, of perchloride of iron and 1 or 2%, of soda or lime acetate, diluted up to 10 times its volume, is suitable for the lixiviation of the various gold ores. With the same volume and the same exposed surface of gold, the above solution will dissolve from within 6 to 12 hours, 15 or ...
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Abstract. This work presents a study of the selective electrowinning of gold from thiosulfate electrolyte, taking into account difficulties related with low gold …
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The reaction orders of silver sulfide leaching with respect to copper sulfate, tartrate, and thiosulfate concentrations in copper sulfate-tartrate-thiosulfate solutions are 0.491, 1.366, and 0.916, respectively. A detailed dissolution route of Ag2S was proposed based on XRD analysis of intermediate products such as Ag3CuS 2, AgCuS and (Ag, Cu)2S.
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A direct thiosulfate leaching test was performed on a chalcopyrite concentrate with 3–5 g/L Cu 2+ addition and mild air sparging. A gold extraction of 97% was obtained after 1 h. Analysis of the leach liquors for thiosulfate indicated that 90–95% of the thiosulfate was accounted for and could be recycled (Berezowsky and Sefton, 1979).
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Solution parameters: 0.6 mol/L sodium thiosulfate, 0.2 mol/L sodium carbonate, 0.05 mol/L Cu (II), 0.05 mol/L sodium citrate and 0.025 mol/L EDTA. …
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Solution parameters: 0.6 mol/L sodium thiosulfate, 0.2 mol/L sodium carbonate, 0.05 mol/L Cu (II), 0.05 mol/L sodium citrate and 0.025 mol/L EDTA. However, as shown in Fig. 9 b, the pH variation significantly affects the amount of soluble copper; at pH values above 11, the soluble copper concentration decreases considerably ( Bas et …
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The leaching behavior of gold from an oxide gold ore using copper–tartrate–thiosulfate solutions has been investigated. Experimental parameters, including temperature, initial pH, and concentrations of copper tartrate and thiosulfate, were systematically studied. The capability of gold leaching using copper–tartrate–thiosulfate …
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Also, these undesirable cations introduce may prevent gold leaching in a thiosulfate leach solution 34 The use of copper powder is a reasonable choice to avoid the above problems, but the ...
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As the most promising alternative reagent to cyanide, thiosulfate has received renewed interest. However, the traditional copper–ammonia–thiosulfate system may face critical challenges in terms of process sustainability because ammonia is toxic and unstable. The use of tartrate as an alternative reagent to ammonia offers a green and …
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Thus, leaching reagent was added like sodium thiosulfate from Sigma MEYER brand with an essay quality of [Na2S2O35H2O] of 99.5–. For the leaching of silver, the kinetics leaching s using thiosulfate solutions was done using the following experimental conditions: concentration of sodium thiosulfate [Na2S2O3], 200 to 500 molm3;
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The Au and Ag recovery from mineral tailings using glycine and sodium thiosulphate showed a leaching recovery of Au more than 80% after 48 h leaching tests with thiosulfate at a solid–liquid ratio of 1:1 . Several studies have been carried out over the last decades to establish the commercial feasibility of Au leaching using thiosulphate.
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This study aims to comprehensively investigate the role of glycine (GL) in gold dissolution with thiosulfate (TS), utilizing both experimental and density functional theory (DFT) approaches. Three different leaching systems, namely AM–TS–Cu2+, GL–TS–Cu2+, and AM–GL–TS–Cu2+, were examined and compared using the response surface …
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Hello I try to leach the gold from blacksand from gold panning. I used Iodized Salt bleach and HCL ... Would Sodium Thiosulfate leach be safer faster and eazier . Reply. B. Blacktoadd Active member. Joined Jul 14, 2008 Messages 38 Location …
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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 …
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Thiosulfate is a green gold lixiviant that has promise to replace cyanide at the gold mining industry. Hexaamminecobalt(III) (Co(NH 3) 6 3+) is effective in catalyzing the thiosulfate leaching of gold from ores, but the electrochemical behavior and catalytic leaching mechanisms remain unclear.This paper reports an in-depth investigation into …
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The use of ammoniumâˆ'thiosulfate solutions to leach gold and silver from the oxidizing leaching residue of copper sulfide concentrates was reported by …
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Table 1 shows the initial gold leach rate (0–10 min) and the gold leach rate between 5 and 7 h for each of the experiments. For comparison, the oxygen diffusion limiting rate for gold leaching in air saturated cyanide solutions at 300 rpm is 55 μmol/m 2 s (Jeffrey and Ritchie, 2000).For each of the leaching systems, it can be seen from both Fig. 3 and …
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In 10 mL of thiosulfate solution, 1 mol of thiosulfate extracts 0.4 g of Au. Therefore, thiosulfate levels in high pulp densities are not sufficient for efficient gold extraction [52]. It may be ...
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According to Table 6, it is evident that the leaching yields obtained in this study are considerably lower in comparison with leaching processes, with the greatest gold leaching efficiency (90% Au) observed with high concentrations of sodium thiosulfate (10 mM ≈ 1120 mg / L) [57], chemical potassium cyanide (350 mg/L) and glycine (0.5 M) [63 ...
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was found to be the optimum pH for this process. Sodium hydroxide (1 M), and sulfuric acid (30% v/v) were used to regulate the pH of dierent leaching systems (Merck, Darm-stadt, Germany). Sodium thiosulfate (99%), copper sulfate (99%), AM (25%), GL (99%), and all other solvents were purchased from Sigma Aldrich Co. Iran Mineral Process-
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Within the tanks, the slurry interacts with thiosulfate and a fine, bead-like material called resin that collects the gold. ... 13,400 tons of ore can be processed daily, with leaching taking ...
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To promote the thiosulfate leaching of gold, the elemental gold in the ore is converted to the ionic form during pressure oxidation. This allows for mild thiosulfate leaching conditions where oxygen, copper, and thiosulfate can be used to leach the gold from neutralized residue without adding ammonia. Download : Download full-size image; …
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Thus, leaching reagent was added like sodium thiosulfate from Sigma MEYER brand with an essay quality of [Na2S2O35H2O] of 99.5–. For the leaching of silver, the …
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Electrochemical investigation on effect of sodium thiosulfate (Na2S2O3) and ammonium chloride (NH4Cl) on carbon steel corrosion. ... O. Sitando, G. Senanayake, …
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A novel and sustainable technology to recover gold from thiosulfate medium using ionic liquids, i.e., Cyphos IL 101 (Cy IL 101) and Cyphos IL 102 (Cy IL 102) diluted …
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However, high temperature and pressure also caused high thiosulfate consumption (55.3 kg/t-ore of sodium thiosulfate) and relatively low gold extraction (87.6%) without additives. Addition of ammonium alcohol polyvinyl phosphate (AAPP) in the tests could reduce thiosulfate consumption to 45.7 kg/t-ore, whilst 90.2% of gold …
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