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THIOSULPHATE LEACHING – AN ALTERNATIVE TO

Thiosulphate leaching is a process that removes gold from gold bearing ores without the use of cyanide. Although not as aggressive a leaching agent as cyanide, thiosulphate offers several technological advantages including its lower toxicity and greater efficiency with gold deposits associated with preg-robbing ores. 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 alternative to cyanidation for some gold

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Thiosulphate Stability In Gold Leaching Process

2004-11-29  The current problem of thiosulphate gold leaching is the high reagent consumption, To understand the decomposition chemistry of thiosulphate, solution stability tests were conducted in open and sealed vessek mder ambient temperature and normal pressure conditions.

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DISSOLUTION OF GOLD WITH CYANIDE REPLACING

2014-9-8  Keywords: gold leaching, ammonium thiosulfate, chloride, thiourea, thiocyanate Introduction The most common hydrometallurgical methods of primary raw 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

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Thiosulfate leaching of gold—A review - ScienceDirect

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 process options have also been discussed. The thiosulfate leaching process it catalysed by copper and has ...

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Thiosulfate leaching of gold—A review - ScienceDirect

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 gold recoveries can be obtained from the thiosulfate leaching of complex and carbonaceous-type ores. In addition, thiosulfate can be cheaper than cyanide.

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Sodium Thiosulphate Gold Leaching

2016-6-2  By necessity, all form strong complexes with gold enabling gold to be leached in a practical Eh range. Thiosulphate provides the strongest alternative complex although this does not compare closely to cyanide. Failed to fetch Error: URL to the PDF file must be on exactly the same domain as the current web page. Click here for more info

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Leaching of Gold with Copper-citrate-thiosulfate Solutions

Leaching tests using gold powder showed that the gold dissolution in a thiosulfate‑oxygen‑copper system in the absence of activated carbon was very slow, with only 2% gold dissolved over 24 h.

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Thiosulfate leaching of gold - A review Request PDF

2021-2-25  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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Gold Extraction in Carbonaceous Ore using Thiosulfate

2017-12-6  Hemmati, et al (1989) proved that the thiosulfate leaching system could be used to recover gold directly from high grade refractory carbonaceous ores. Much higher recoveries were obtained when using thiosulfate as a lixiviant instead of cyanide, however reagent consumption was high due to the extreme leach

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Leaching Gold and Silver with an Alternative System ...

2019-7-9  The leaching tests were carried out with sodium thiosulfate, glycine and sodium thiosulfate-glycine to compare the efficiency and stability of extractants in the recovery of gold and silver. All tests were carried out under the following conditions: 1000 g of mineral with 1000, 2000 and 3000 ml of solution (liquid–solid ratio 1:1, 2:1 and 3:1).

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Ammoniacal thiosulphate leaching of gold ore

2016-6-2  leaching of gold as its absence makes gold passive by the build up of sulphur coating on the surface as a result of decomposition of thiosulphate. It is known that thiosulphate is a meta-stable species that readily undergoes decomposition in aqueous solutions. Ammonia adsorbs onto the gold surface preferentially over

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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 system.The 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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Improvement of thiosulfate stability in gold leaching ...

2003-5-1  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 ...

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Factors affecting gold leaching in thiosulfate-O2 solutions

2013-5-30  ALTA 2013 Gold Conference, Perth, WA, Australia, 25 May - 1 June 2013 Pages: 9p Abstract: 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.

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Thiosulfate Leaching Process for Gold Extraction

2017-2-20  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

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Selective Electrochemical Gold Recovery from Leaching ...

2017-5-3  The electro-recovery of gold from thiosulfate leaching systems was evaluated on Pt electrode using S3 solution with a gold concentration of 0.0014 mol L −1 (27.4 mg of dissolved gold). In Figure 5 the characteristic oxidation Cu/Cu(I)/Cu(II) and reduction Cu(II)/Cu(I)/Cu peaks discussed in the previous results are observed.

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Recovery of Gold from Thiosulfate Solutions and Pulps

2010-12-21  3.6 CHEMISTRY OF GOLD LEACHING WITH THIOSULFATE 100 3.6.1 The Rate of Conversion of Copper (II) to Copper (I) 100 3.6.2 Stability of Copper (II) Amine in a Thiosulfate Solution 100 3.7 ADSORPTION EXPERIMENTS 102 3.7.1 Gold Loading on Various Commercial Resins 102 3.7.2 Loading of Sulfur Anions 102 ...

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An assessment of the environmental risks posed by the ...

2021-7-23  thiosulfate gold leaching process combined with dry tails stacking. Simon C. Apte, Jason Kirby, Chad V. Jarolimek , Cathy Fiebiger and Caroline Johnston Reproduced from Report EP211345 . May 2021 . Report prepared for Clean Mining Pty Ltd . Commercial-in-confidence .

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金矿非氰化浸金研究进展 - USTB

2020-11-15  Liu X L, Xu B, Yang Y B, et al. Effect of galena on thiosulfate leaching of gold. Hydrometallurgy, 2017, 171: 157 doi: 10.1016/j.hydromet.2017.05.011 [14] Yang Y B, Gao W, Xu B, et al. Study on oxygen pressure thiosulfate leaching of gold without the catalysis

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FUNDAMENTAL ASPECTS OF GOLD LEACHING IN

2020-7-24  thiosulfate leaching of gold (Jiang et al, 1993a) 38 Figure 2.25 Mechanism of gold leaching in ATS system in the presence of copper ion (Ouyang, 2001) 42 Figure 2.26 The electrochemical model for the copper catalysis mechanism of leaching gold with ammoniacal thiosulfate.( Aylmore et al, 2001a) 43

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Factors affecting gold leaching in thiosulfate-O2 solutions

2013-5-30  ALTA 2013 Gold Conference, Perth, WA, Australia, 25 May - 1 June 2013 Pages: 9p Abstract: 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.

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ammonium thiosulfate leaching gold - jcc2019.cl

Leaching of gold and silver from printed circuit board . Leaching of gold and silver from printed circuit board of mobile phones. Inquire Now; Leaching of Gold DocCopper Copper, Gold and . Leaching of Gold with Various ... Gold will dissolve in the presence of ammonium thiosulfate as ... Here is a more scientific explanation of thiosulfate ...

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Gold recovery from thiosulfate leaching - The University ...

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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Thiosulfate Leaching of Middle-Refractory Gold Ore with ...

Leaching of middle-refractory gold ore show that both of the consumption of thiosulfate and leaching rate was decreased compare to the traditional copper–ammonia thiosulfate system. Thiourea is not stable in base solution, but it was found that gold dissolution rates can be increased with a little thiourea ,the mechanism is still unclear.

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Gold Leaching from Printed circuit Board Scrap with ...

The optimum leaching conditions were as follows; leaching time was 4h, leaching temperature was 25 °C, thiosulfate concentration was 0.5moll-1, ammonia concentration was 1.2moll-1, copper ion concentration was 0.04moll-1, slurry pH was 10, stirring speed was 300rpm, Na 2 SO 3 concentration was 0.1moll-1 respectively. The gold leaching ratio of ...

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Recovery of Gold from Thiosulfate Solutions and Pulps

2010-12-21  3.6 CHEMISTRY OF GOLD LEACHING WITH THIOSULFATE 100 3.6.1 The Rate of Conversion of Copper (II) to Copper (I) 100 3.6.2 Stability of Copper (II) Amine in a Thiosulfate Solution 100 3.7 ADSORPTION EXPERIMENTS 102 3.7.1 Gold Loading on Various Commercial Resins 102 3.7.2 Loading of Sulfur Anions 102 ...

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金矿非氰化浸金研究进展 - USTB

2020-11-15  Liu X L, Xu B, Yang Y B, et al. Effect of galena on thiosulfate leaching of gold. Hydrometallurgy, 2017, 171: 157 doi: 10.1016/j.hydromet.2017.05.011 [14] Yang Y B, Gao W, Xu B, et al. Study on oxygen pressure thiosulfate leaching of gold without the catalysis

Get Price

DISSOLUTION OF GOLD WITH CYANIDE REPLACING

2014-9-8  Keywords: gold leaching, ammonium thiosulfate, chloride, thiourea, thiocyanate Introduction The most common hydrometallurgical methods of primary raw 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

Get Price