silver leaching with ammonium thiosulfate

    Sodium Thiosulphate Gold Leaching

    2020-06-17· 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 which can make cyanide unattractive in some circumstances. However

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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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Evaluation of gold and silver leaching from printed circuit

After that, acid leaching process to extract silver, using nitric acid, was made. Another test was made, using a commercial reagent, that is, cyanide-based to extract gold. Following, studies using sodium and ammonium thiosulfate was performed to investigate the possibilities of using these leaching agents to extract gold and silver from PCBs. 2.

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Thiosulfate leaching of gold A review Request PDF

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.

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Ammonium thiosulfate Wikipedia

OverviewApplicationsProductionSafetySee also

Ammonium thiosulfate is used in photographic fixer. It is a so-called rapid fixer, acting more quickly than sodium thiosulfate fixers. Fixation involves these chemical reactions (illustrated for silver bromide): AgBr + 2 (NH4)2S2O3 → (NH4)3[Ag(S2O3)2] + NH4Br AgBr + 3 (NH4)2S2O3 → (NH4)5[Ag(S2O3)3] + NH4BrAmmonium thiosulfate is also used for leaching of gold and silver. It works with presence of copper as a cat

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THIOSULPHATE LEACHING AN ALTERNATIVE TO CYANIDATION

2016-02-17· THIOSULPHATE LEACHING AN ALTERNATIVE TO CYANIDATION IN GOLD PROCESSING ALTERNATIVES TO CYANIDE IN GOLD PROCESSING THIOSULPHATE LEACHING Thiosulphate leaching is a process that removes gold from gold bearing ores without the use of cyanide. Although not (ammonium thiosulphate and ammonium sulphate) are common fertilizers,

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Leaching of gold, silver and accompanying metals from circuit

2017-09-13· 16 % gold and 12 % silver into leach after 48 hours of leaching. The results for the same but the pretreated waste by milling have accelerated the process of thiosulfate leaching. Pretreatment enables to achieve for the ammonium thiosulphate leaching with ammonium 98 % gold and 93 % silver extraction after 48 hours of leaching (Fig. 2). 60 Fig. 2.

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(PDF) Silver sulfide leaching with a copper-thiosulfate

Silver sulfide leaching with a copper-thiosulfate solution in the absence of ammonia Article (PDF Available) in Rare Metals 30(2):105-109 · April 2011 with 949 Reads How we measure 'reads'

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Ammonium thiosulfate ecological alternative to replace

2014-11-21· Ammonium thiosulfate ecological alternative to replace sodium cyanide in gold and silver dissolution in low-grade ores, M.C Hernández, E. Acosta, M.C Avitia,...

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DISSOLUTION OF GOLD WITH CYANIDE REPLACING REAGENTS

2014-09-08· Ammonium thiosulfate Bisulfide Iodide Ammonia Bromide Hypochlorite Fig. 1. Potential-pH diagram showing typical operating windows for gold lixiviants (after Aylmore, 2005) In leaching of gold a complexing ligand and oxidant are needed. Dissolution of gold in cyanide solution is shown in Eq. 1. At low cyanide concentrations, the

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Ammoniacal thiosulphate leaching of gold ore

2016-06-02· 344 The European Journal of Mineral Processing and Environmental Protection Vol.3, No.3, 1303-0868, 2003, pp. 344-352 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,

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Role of oxygen and ammonium ions in silver leaching

Leaching silver with 4 mg·L −1 oxygen in the aqueous solution requires high concentration of ammonium and thiosulfate ions. High silver dissolution is achieved at pH of high cupric tetraamine concentration, around pH 9.8, but a high degradation of thiosulfate ions is resulted from their oxidation by the presence of oxygen.

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(PDF) Silver sulfide leaching with a copper-thiosulfate

Silver sulfide leaching with a copper-thiosulfate solution in the absence of ammonia Article (PDF Available) in Rare Metals 30(2):105-109 · April 2011 with 949 Reads How we measure 'reads'

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Ammonium thiosulfate ecological alternative to replace

2014-11-21· Ammonium thiosulfate ecological alternative to replace sodium cyanide in gold and silver dissolution in low-grade ores, M.C Hernández, E. Acosta, M.C Avitia,...

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DISSOLUTION OF GOLD WITH CYANIDE REPLACING REAGENTS

2014-09-08· Ammonium thiosulfate Bisulfide Iodide Ammonia Bromide Hypochlorite Fig. 1. Potential-pH diagram showing typical operating windows for gold lixiviants (after Aylmore, 2005) In leaching of gold a complexing ligand and oxidant are needed. Dissolution of gold in cyanide solution is shown in Eq. 1. At low cyanide concentrations, the

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Ammonium thiosulfate Wikipedia

2020-05-23· 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.

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thiosulfate gold leaching 」

Effect of additives on thiosulfate leaching of a gold ore *S.J. Dai, P.C. Li, Q.Q. Wang,D.W. Feng University of Science and Technology, Liaoning, Anshan, China Received August 15, 2017, Revised November 15, 2017 The effect of additives on gold leaching was investigated using ammonium thiosulfate or calcium thiosulfate.

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ammonium thiosulfate gold leaching

Ammoniacal Thiosulfate Leaching. Ammonium thiosulfate has been used in photography for many decades. It is also used as fertilizer and from an environmental standpoint, has a definite advantage over cyanide. Dissolution rates of gold and silver in thiosulfate are comparable to those for thiourea and faster than cyanide. Inquire Now

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Thiosulphate Leaching Mining SGS

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

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thiosulfate gold leaching

The results for leaching gold with alternative reagents, sodium thiosulfate and ammonium hydroxide, show that the best extraction was achieved at 0.1M sodium thiosulfate and 0.2M ammonium hydroxide, when adding 0.1M of hydrogen peroxide as an oxidation agent, obtaining approximately 11% of gold.

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