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[15] Feng D. and van Deventer J. S. J. 2006 Ammoniacal thiosulphate leaching of gold in the presence of pyrite Hydrometallurgy 82 126. Crossref; Google Scholar [16] Grosse A. C., Dicinoski G. W., Shaw M. J. and Haddad P. R. 2003 Leaching and recovery of gold using ammoniacal thiosulfate leach liquors (a review) …
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The benefits and drawbacks of microbial gold leaching over traditional cyanide-based gold leaching are discussed. ... In a commercial-scale gold tank cyanidation, a sodium or potassium cyanide solution usually is used with a concentration of 0.01–0.05% ... and sulfite ions to solubilize gold and silver. About 79% of the gold and …
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The leaching kinetics of antimony from refractory gold ore in alkaline sodium sulfide was investigated under ultrasound. The influence of factors such as stirring speed, temperature, the concentration of sodium hydroxide and sodium sulfide and particle size, was studied. The leaching kinetics has also been studied under …
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It is shown that gold does not virtually dissolve in alkaline (pH 12.5) solutions containing either thiocarbamide or sodium sulfite. Gold dissolves in alkaline solutions simultaneously ... The use of copper as a catalyst for gold leaching in ammonium thiosulfate solution might cause the high consumption of thiosulfate. Also, the high …
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By including sodium sulfite in the gold-thiourea system, it was possible to obtain the Au(I)-TU complex at alkaline pH, with a presence of 95.13%. ... The gold leaching kinetics were monitored by ...
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DOI: 10.1016/J.CHERD.2020.09.029 Corpus ID: 224863309; Leaching Kinetics of Antimony from Refractory Gold Ore in Alkaline Sodium Sulfide under Ultrasound @article{Hu2020LeachingKO, title={Leaching Kinetics of Antimony from Refractory Gold Ore in Alkaline Sodium Sulfide under Ultrasound}, author={Yuting Hu and Ping Guo and …
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The extraction of gold from refractory gold ores (RGOs) without side reactions is an extremely promising endeavor. However, most RGOs contain large amounts of sulfide, such as pyrite. Thus, investigation of the influence of sulfide on the gold leaching process is important to maximize the utilization of RGOs. In this work, the effects of …
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Rizki et al. reported that although the addition of sodium sulfite to the leaching system did not improve the gold recovery, the remaining thiourea in solution …
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Thiosulfate leaching is a promising alternative to cyanidation, and the main hindrances for its wide commercial application are the high thiosulfate …
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The effects of these stabilizers on the activation energy of alkaline thiourea gold leaching was also studied. The results showed that sodium silicate was more suitable as a stabilizer in this system than sodium sulfite because the peak current of gold dissolution with sodium sulfite was higher than that with sodium silicate, but the …
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Following leaching, gold ions remain dissolved in the solution, together with other elements. It is necessary to recover gold ions from this solution, separating them from the other dissolved metals present. This section of the paper reviews some of the most common methods used to recover gold from leaching solution. 5.1. Activated carbon (AC)
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Compared with leaching without sodium sulfite, the addition of sodium sulfite significantly increases gold dissolution. This effect becomes more pronounced as the sodium sulfite concentration is increased. Without using any stabilizing additives, only 45% of the gold is recovered from the leach solution.
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The sodium sulfite slurry is prepared by passing sulfur dioxide through soda ash solution. Oxidation of polysulfides generates thiosulfate as follows (Greenwood et al, …
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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, …
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Most gold deposits occur associated with sulphides like pyrite and arsenopyrite; thus, precious metal dissolution is possible by oxidizing auriferous sulfide concentrate using simultaneous pressure oxidation and cyanidation. The effectiveness of this process of extraction can be influenced by the temperature, cyanide (NaCN) …
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Malononitrile was comparable to equal molar quantities of sodium cyanide in leaching gold from oxide ore and yielded 10–20 % higher recovery in leaching a refractory carbonaceous ore, although dissolution was slower with malononitrile than with cyanide (Heinen et al., 1970). Nitriles are also toxic, but they are far less harmful than cyanide.
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In the leaching process, due to the small stable constant of Ag (SO 3) 2 3 − which was measured to be 7.9 (Baltrunas et al., 2008) and readily oxidizing sulfite by oxygen dissolved in aqueous solution, a high concentration of sodium sulfite is inevitably implemented for the silver recovery, consequently, leading to a high consumption …
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Gold leaching from its ores using thiosulfate solutions has been extensively investigated and is relatively well understood over the past several decades ... With the addition of 0.1 M sodium sulfite, however, …
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Gold leaching by thiourea has been investigated in an alkaline solution. In the presence of both Na 2 SO 3 and Na 2 S 2 O 8, the chemical dissolution of gold can be accomplished in the alkaline thiourea solution. It was found that used as a buffer, SO 2- 3 can prevent thiourea from further decomposing into some insoluble species in contact …
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The effects of these stabilizers on the activation energy of alkaline thiourea gold leaching was also studied. The results showed that sodium silicate was more suitable as a stabilizer in this system than sodium sulfite because the peak current of gold dissolution with sodium sulfite was higher than that with sodium silicate, but the …
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Selected leaching results Unlike gold cyanidation, thiosulfate leaching involves relatively high concentrations of reagents, while the gold extraction is largely dependent on the presence or absence of various background reagents. The complexity of thiosulfate leaching of gold is exemplified in Figure 1 (14). It shows that sulfite,
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Alkaline sulfur-containing lixiviants, including thiosulfate, polysulfides, and alkaline sulfide solutions, stand out as a promising class of alternatives to cyanide …
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Semantic Scholar extracted view of "Recovery of tellurium from high tellurium-bearing materials by alkaline sulfide leaching followed by sodium sulfite precipitation" by Guo Xueyi et al. ... when eliminating the adverse effects ofTelluride on the leaching of gold and silver, provides new ideas for the extraction of rare elementtellurium. ...
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Loaded gold on CMA was easily eluted using a sodium sulfite solution, achieving a gold recovery of 62.2 %, even after four adsorption–desorption cycles. Finally, in the actual gold ore leachate adsorption and slurry adsorption method, the adsorption of gold and copper by CMA is approximately 98 % and 7 %, respectively.
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Copper sulfide was then recovered from the leach solution via precipitation by sodium hydrosulfide. Gold leaching in the glycine + permanganate system was thoroughly studied with an emphasis on the process's kinetics mechanisms. It was revealed that gold leaching in the glycine and permanganate system starts with a rapid phase …
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So in this paper, with a silver-containing gold ore taken as the research object, the effects of additive sodium sulfite, main gold-bearing mineral pyrite and gangue mineral quartz on silver leaching during roasting process are studied by roasting leaching test, SEM-EDS analysis, thermodynamic calculation and TG-DSC analysis.
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A process using soda roasting–alkaline leaching–acid leaching to remove selenium, tellurium and copper sequentially from the copper anode slime with high content of Ni was tested. ... Recovery of gold from secondary sources—A review [J] ... Leaching kinetics of selenium from selenium–tellurium-rich materials in sodium sulfite solutions ...
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The linear potential sweep voltammetry and electrochemical methods were used to study the mechanism and kinetics of gold dissolution in thiourea solution in the absence and presence of sodium sulphite. The results show that in the absence of sodium sulfite the dissolution rate of gold in thiourea solution is relatively slow and it increases with the …
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The use of thiosulfate to extract gold from refractory ores is promising because of its non-toxicity and high selectivity. Sulfide minerals (i.e., pyrite, arsenopyrite, chalcopyrite), major gold carriers in refractory gold ores, however, hinder gold extraction due to the high consumption of a lixiviant. In this study, a new method to improve gold …
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The leaching behaviors of gold and silver from a complex sulfide concentrate in copper-tartrate-thiosulfate solutions were investigated in this paper. Experimental parameters, including temperature, initial pulp pH, and concentration of copper, tartrate, and thiosulfate, were systematically studied. The copper-tartrate-thiosulfate leaching system …
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