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PDF Thiosulphate leaching for gold hydrometallurgy ,

With leaching at high thiosulphate concentrations, namely 2 M 20 -, the rate of gold extraction is high a recovery of about 60 after the first hour of attack is achieved When leaching proceeds further the dissolution of gold increases a little to about 70 at the third hour Fig 2...

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Recent Advances in the Development of an Alternative to ,

Thiosulphate leaching of gold and silver ores has been studied by many researchers over the years and there is an extensive literature on the subject Some recent examples are the papers by Tozawa et al, 1981, Langhans et al, 1992 and Li et al, 1995 The chemistry...

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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 ,...

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Thiosulphate Stability In Gold Leaching Process

Ammonium thiosulphate is an alternative gold leaching Laaviant used to replace cyanide 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...

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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 Review of Thiosulfate Leaching of Gold Focus on ,

15-06-2017 0183 32 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 ,...

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Thiosulphate Stability In Gold Leaching Process

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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Leaching of Gold from the Waste Mobile Phone Printed ,

02-01-2012 0183 32 lixiviant for gold leaching which efficiently recovers gold 3 but this is not an economical route for the gold leaching due to its high consumption and cost Thiosulfate leaching to recover gold from ores is known for several decades but extensive researches have been started only for the past two decad 4...

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Leaching of the Mixture of Metallic Gold and Silver ,

30-04-2017 0183 32 In both thiosulfate and thiourea solution, gold was not dissolved at all The presence of ferric ion in acidic thiourea solution showed a favorable effect on the leaching of silver but further study is necessary to elucidate the combined effect of ferric ion and sulfuric ac...

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COMPARISON OF CYANIDE AND THIOSULPHATE LEACHING FOR GOLD ,

cyanide for gold leaching These two lixiviants have been compared based on the information available in scientific literature Thiosulphate leaching can be considered as a non-toxic process It has its own pros and cons which have been discussed ,...

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Improved thiosulfate leaching of a refractory gold ,

Abstract One of the major problems of thiosulfate leaching was the high consumption of thiosulfate In this work, additive was used to reduce thiosulfate consumption and simultaneously increase gold leaching Thiosulfate leaching without additive was not effective to treat a refractory gold concentrate calcine with high iron, sulfur and arsenic due to its low ,...

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Associated Sulfide Minerals in Thiosulfate Leaching of ,

Thiosulfate-copper-ethylenediamine system was found effective in the leaching of gold The leaching kinetics was significantly slower than that of the conventional thiosulfate-copper-ammonia leaching The consumption of thiosulfate, however, was largely reduced This leaching system worked...

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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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The modes of gold loss in the calcium thiosulfate leaching ,

Barrick Gold recently commercialized a unique calcium thiosulfate leaching plant to treat these problematic ores after an autoclave pre-treatment with simultaneous recovery of the dissolved gold-thiosulfate complex onto anion exchange resins Nonetheless, this new process can experience unexpected losses in gold from solution...

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Sodium Thiosulphate Gold Leaching

02-06-2016 0183 32 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 Thiosulphate-Gold-Leaching-Process Comparison-of-Cyanide-and-Thiosulphate-Leaching-for-Gold-Production...

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Thiosulphate Leaching SGS South Africa

Thiosulphate Leaching Thiosulfate leaching is a process that recovers gold from ore without the use of cyanide SGS developed the thiosulfate leaching process because in some jurisdictions, increased regulation pressure means that cyanide cannot be used or transported We are a global technical leader in the field of thiosulfate leaching...

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Fundamental aspects of gold leaching in thiosulfate ,

The kinetics and mechanism of gold leaching in the ammonia-thiosulfate-copper ATS-Cu system have been studied using the rotating electrochemical quartz crystal microbalance REQCM Anodic polarization, cathodic polarization and leaching experiments were included in ,...

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PDF A Review of Thiosulfate Leaching of Gold Focus on ,

15-06-2017 0183 32 Ahern, N Thiosulfate Degradation during Gold Leaching in Ammoniacal Thiosulfate So lutions A Focus Trithionate Ph D Thesis, Univer sity of British Columbia, V anc ouv er, BC, Canada, October ....

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sodium thiosulphate And hypochloride leaching Gold ,

27-10-2016 0183 32 Thiosulfate leaching is not a preferred method for several reasons The leach solutions are generally in the range 5 to 30 grams per litre ammonium thiosulfate, around 7 grams per litre blue copper sulfate with ammonium hydroxide added to pH 95 to 10 This is a fairly narrow pH slot in which to operate...

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THE INCREASED ACTIVITY IN THE DEVELOPMENT OF THIOSULFATE ,

concentration gold thiosulfate solutions eg leaching of gravity concentrates , sulfide precipitation and copper cementation are alternative gold recovery options However, unlike the resin technology which produces a high grade gold product, sulfide precipitation and copper cementation produce a...

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Study on Gold Extraction from Thiosulfate

The leaching conditions are grinding fineness -74μm 95 , ammonium thiosulfate concentration is selected as 03mol/L, copper ion concentration is selected as 0005mol/L, ethylenediamine concentration is selected as 006mol/L, and the pH value is adjusted to about 10, liquid to solid mass ratio of 3 1, stirring and leaching at room temperature for 7h, on this basis, the gold ,...

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Hydrometallurgical Recovery of Gold from Mining Wastes ,

There are a considerable number of gold leaching methods which are currently tested or developed as pilot-scale studies, but only a few are available on commercial scale The most tested leaching agents for gold are thiosulfate, thiourea, thiocyanate and halides 19, 20, 21...

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THIOSULPHATE LEACHING FOR GOLD PRODUCTION JACOB ,

07-06-2018 0183 32 Thiosulfate leaching is a process that recovers gold from ore without the use of cyanide Jacob Jason Demedici developed the thiosulfate leaching process because in some jurisdictions, increased....

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Gold dissolution in non

Keywords Thiosulphate, gold oxidation, leaching, electrochemistry, kinetics Introduction Concern about the environmental impact of the widely used cyanidation technology has generated a lot of interest in searching for an alternative process for gold leaching over the past years Thiosulphate has been considered by many...

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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 ,...

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