thiosulfate leaching of gold

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A novel green method for copper recovery from cuprous ,

Nov 19, 2021 0183 32 At the same time, Newmont Mining Corporation and Barrick Gold Corporation have industrially implemented thiosulfate leaching of gold from carbonaceous gold ores in a large-scale pilot plant Fleming et al, 2003...

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Gold Extraction in Carbonaceous Ore using Thiosulfate

Dec 06, 2017 0183 32 Column leaching tests with thiosulfate further demonstrated that 69 to 78 pct of the gold could be directly recovered while consuming 04 to 54 kg thiosulfate/mt ore Continuous recycle of the leach solution led to increased leaching times for comparable precious metal recoveries, but also significantly increased the concentration of gold in ....

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Effect of Triethanolamine as a New and Efficient Additive ,

Jul 23, 2019 0183 32 Leaching of gold with thiosulfate is one of the non-cyanide leaching techniques that have received much attention as a cyanidation replacement because of global concerns regarding the toxicity and environmental issues of cyanide1,2,3,4,5,6,7 Thiosulfate leaching of gold ore can exert a remarkable leaching effect with cupric tetra-amine acting as the oxidant...

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Leach Gold using Hyposulphite Of Sodium AKA Thiosulfate ,

Jan 11, 2016 0183 32 Leach Gold using Hyposulphite Of Sodium AKA Thiosulfate Gold Extraction Thiosulfate Gold Extraction The fact that gold will dissolve in sodium hyposulphite solutions is known from the lixiviation of silver and gold or The gold will dissolve only in small quantiti According to researchers, if gold leaf is treated for a time with sodium ....

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Thiosulfate leaching of gold catalyzed by ,

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 unclearThis paper reports an in-depth investigation into the electrochemical behavior of gold leaching in ....

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Associated Sulfide Minerals in Thiosulfate Leaching of ,

The effects of some associated minerals on thiosulfate gold leaching were studied through thermodynamic analysis and leaching experiments on composite ore samples containing various minerals and a reference silicate gold ore In the leaching test on the reference gold ore, about 93 of gold was extracted within 30 hours...

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PDF Study on effect of temperature on gold leaching from ,

In optimising the recovery of gold from ores with copper-ammonia-thiosulfate leach solutions it is important to evaluate and minimise any negative effect an ore may have on the leach solution ....

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The role of ligands and oxidants in thiosulfate leaching ,

Despite the fact that the gold mining industry accounts for only 13 of total cyanide consumption there is growing public concern over the use of toxic cyanide for gold extraction Many researchers have identified that thiosulfate leaching is the most likely alternative to cyanidation due to nontoxicity, low cost and other benefits...

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A novel thiosulfate system for leaching gold without the ,

The thiosulfate lixiviant system for leaching of gold has been under extensive investigation for nearly two decades and consists of ammonium thiosulfate, copper and ammonia...

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Gold recovery from thiosulfate leaching

Processes for recovering gold from copper-gold ores thiosulfate leaching or gold ores copper catalyzed thiosulfate leaching using ion exchange technology are disclosed The processes include subjecting the gold-bearing and copper-bearing thiosulfate solution to a pH and/or temperature adjustment to reduce tetrathionate concentration in the ....

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A review of gold extraction using noncyanide lixiviants ,

Apr 14, 2020 0183 32 S Joshi and E Asselin, Kinetics of gold leaching in alkaline sulfide solutions, in Proceedings of the 50th Annual Conference of Metallurgists of CM, Montreal, 2011, p 341 Google Scholar 94 PL Breuer and MI Jeffrey, Thiosulfate leaching kinetics of gold in the presence of copper and ammonia, Miner...

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PDF Thiosulfate leaching of gold from waste mobile ,

The influence of thiosulfate, ammonia and copper sulfate concentrations on the leaching of gold from PCBs of waste mobile phones was investigated Gold extraction was found to be enhanced with solutions containing 15-20 mM cupric, 01-014 M thiosulfate, and 02-03 M ammonia...

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Thiosulfate Leaching Process for Gold Extraction

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 and copper onto resin in...

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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 catalyzed the decomposition and also significantly increased the consumption of thiosulfate This detrimental effect became more severe with increasing pyrite content...

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COMPARISON OF CYANIDE AND THIOSULPHATE ,

leach significant quantities of gold without consuming excessive quantities of reagents Thiosulphate is a more effective lixiviant of preg-robbing and high-copper ores than cyanide because ammoniacal thiosulphate leaching is less sensitive than cyanidation to...

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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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thiosulfate leaching Gold Refining Metal Extraction Forum

May 19, 2011 0183 32 Has anyone here actually used thiosulfate for leaching gold ore,and had positive results,that can be repeatable as a real leaching process? Has anyone found a real working precipitation process to recover the gold,that works well,and is dependable? Also getting the gold out of the precipitates seems to be a real pain...

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Gold leaching in thiosulfate solutions and its ,

Gold and silver leaching in thiosulfate solution is preferable kinetically and environmentally if conducted in a closed vessel systemThe effect silver alloyed with gold was evaluated and the result showed that the dissolution rate of pure gold is higher than that form 4 and 8 wt Ag alloys And the dissolution rate of gold from 20 and 50 ....

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Sodium Thiosulphate Gold Leaching

Jun 02, 2016 0183 32 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 ....

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Effect of Pyrite on Thiosulfate Leaching of Gold and the ,

Ammoniacal thiosulfate has been studied over the last three decades as a nontoxic and highly-efficient alternative lixiviant to cyanide for leaching gold from gold ores with copper II acting as a catalyst 1,2 Much of the work has concentrated on copper-gold ores, carbonaceous gold ores and complex sulfidic gold ores where the recovery of gold by cyanidation is unsatisfactory or the ....

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Cyanide alternative leaching reagents for gold recovery ,

Thiosulfate leaching can be considered a non-toxic process, the gold dissolution rates can be faster than conventional cyanidation and, due to the decreased interference of foreign cations, high ....

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A Review of Thiosulfate Leaching of Gold Focus on ,

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 recovery of dissolved gold In this review, the four solutions to reduce the consumption of thiosulfate, including the control of reaction conditions, the use of additives, the generation of thiosulfate in situ, and ....

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A systematic review of sustainable gold extraction from ,

Download Citation A systematic review of sustainable gold extraction from raw ores using alternative leaching reagents Drawing on recent experimental and commercial developments, this review ....

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