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fundamental of thiosulfate leach of gold

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Gold leaching in thiosulfate solutions and its ,

Thiosulfate is one of the most promising alternative substitutes to cyanide kinetically and environmentallyGold leaching in thiosulfate solutions was evaluated environmentally and kinetically in different ways: (1) applying a closed system to leach gold (2) evaluating the environmental and metallurgical optimum thiosulfate leaching characteristics for pure gold and pure silver and gold ,...

Biooxidation‒thiosulfate leaching of refractory gold ,

21-07-2019· A process of biooxidation followed by thiosulfate leaching of gold from refractory gold concentrate was investigated Mineralogical studies on the concentrate showed that very fine gold grains (<10 μm) were encapsulated in pyrite and arsenopyrite, while the proportion of monomer gold was only 21% The gold-bearing sample was identified as a high-sulfur fine-sized wrapped-type refractory gold ....

The process design of gold leaching and carbon-in-pulp ,

The leaching of gold can be conveniently represented by the Elsener equation: [1] Although air agitated leach tanks were commonly used in the industry, mechanically agitated reactors are preferred due to lower operating costs Typical residence times in the leach section may range from 20–40 hours depending on the head-...

Gold recovery from refractory gold concentrates by ,

be exposed Mohammadi et al investigated ammoniacal thiosulfate leaching of refractory oxide gold ore, and they obtained maximum gold extraction of 55% (Mohammadi et al, 2017) Shen et al had researched the direct thiosulfate leaching of gold from refractory ore, and they achieved gold recovery of only 70% (Shen et al, 2013)...

Gold recovery from refractory gold concentrates by ,

be exposed Mohammadi et al investigated ammoniacal thiosulfate leaching of refractory oxide gold ore, and they obtained maximum gold extraction of 55% (Mohammadi et al, 2017) Shen et al had researched the direct thiosulfate leaching of gold from refractory ore, and they achieved gold recovery of only 70% (Shen et al, 2013)...

THE RECOVERY OF GOLD FROM A PREAGNANT GOLD-THIOSULFATE ,

gold-thiosulfate leach solution containing 01 M ammonium thiosulfate (ATS) and 10 mg/L Au onto the columns of Amberjet-4200 and IRA-400 res-ins are shown in Fig 2 The effluent was collected in fractions at different times in order to observe the kinetics of the loading process...

A fundamental study of gold leaching in a thiosulfate ,

A fundamental electrochemical study of gold and gold/silver alloys in thiosulfate solutions showed that although the oxidation is a complex process, there was no selective dissolution of either ....

THIOSULPHATE LEACHING – AN ALTERNATIVE TO CYANIDATION ,

• Cementation of gold from thiosulphate leach solution onto copper metal powder, or some other reductant, following separation of solids and liquids in the leach slurry by filtration or counter current decantation Use of the resin-in-pulp method is limited to those deposits requiring mild...

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 ....

leaching of gold with thiosulfate - moc-anandanl

06-07-2020· Fundamental of thiosulfate leach of gold A Review of Ammoniacal Thiosulfate Leaching of Gol ABSTRACT This literature review provides an update of ammoniacal thiosulfate as a potential lixiviant of gold, the history of thiosulfate leaching and recent progress on thiosulfate leaching of gold, as well as the production, oxidation, and stabilization of thiosulfate ...

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 ....

Recovery of Gold and Silver from Oxidation Leach Residues ,

An atmospheric ammoniacal thiosulphate leach system was developed to recover gold and silver from residues of the amoniacal oxidation leaching of sulphidic copper concentrat Extractions of 88 - 95% Au and 83 - 98% Ag were attained within 2 to 4 hours at 40 - 60°C in ,...

Fundamental aspects of gold leaching in thiosulfate ,

Fundamental aspects of gold leaching in thiosulfate solutions Li, Cheng Abstract 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)...

DISSOLUTION OF GOLD WITH CYANIDE REPLACING REAGENTS

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...

Recovering gold from thiosulfate leach pulps via ion ,

However, the thiosulfate process lacks a proven inpulp method of recovering the dissolved gold because activated carbon is not effective for the absorption of the gold-thiosulfate complex This paper describes work aimed at evaluating the effectiveness of commercially available anion exchange resins for the recovery of gold from thiosulfate leach liquors and pulps...

thiosulfate leaching - Gold Refining Forum

19-05-2011· out if Thiosulfate is a viable process for extracting gold I would like to hear the facts,from someone that has used it in a real mining situationBits and pieces of information are what is dangerous with any process I have edited this to include some information that may help the forum members in the future, and one in particular...

Cyanide alternative leaching reagents for gold recovery ,

gold loss due to dissipation, the need for a variety of time consumptive processing steps until precious metals can be recovered [12, 13] Although cyanide is the established gold recovery process, there are many reagents which are also ca-pable to form soluble gold complex But only thiosulfate, thiourea, halide, thiocyanate and sulfide...

THE INCREASED ACTIVITY IN THE DEVELOPMENT OF THIOSULFATE ,

this past research has focused on the leaching of gold from ores with thiosulfate and fundamental studies of the complex system chemistry and interactions with minerals, particularly the detrimental impact of sulfide minerals There has also been a number of thiosulfate leach systems investigated which are characterised by the oxidant system used...

THE DISSOLUTION OF GOLD COLLOIDS IN AQUEOUS THIOSULFATE ,

gold, thiosulfate ions and the mixed complex Cu(NH 3) p(S 2O 3) 0 The half order reactions support electrochemical mechanisms in some cas The initial dissolution rates of gold colloid, massive gold and gold-silver alloys by oxygenated copper(II) solutions also suggest a reaction that is first order with...

THIOSULPHATE LEACHING – AN ALTERNATIVE TO CYANIDATION ,

• Cementation of gold from thiosulphate leach solution onto copper metal powder, or some other reductant, following separation of solids and liquids in the leach slurry by filtration or counter current decantation Use of the resin-in-pulp method is limited to those deposits requiring mild...

fundamental of thiosulfate leach of gold

fundamental of thiosulfate leach of gold thiosulfate leaching - Gold Refining Forum2011/05/19 out if Thiosulfate is a viable process for extracting gold I would like to hear the facts,from someone that has used it in a real mining situationBits and pieces of information are what is dangerous with any process...

Fundamental aspects of gold leaching in thiosulfate solutions

Download Citation | On Jan 1, 2003, Cheng Li published Fundamental aspects of gold leaching in thiosulfate solutions | Find, read and cite all the research you need on ResearchGate...

Recovering gold from thiosulfate leach pulps via ion ,

However, the thiosulfate process lacks a proven inpulp method of recovering the dissolved gold because activated carbon is not effective for the absorption of the gold-thiosulfate complex This paper describes work aimed at evaluating the effectiveness of commercially available anion exchange resins for the recovery of gold from thiosulfate leach liquors and pulps...

Fundamental aspects of gold leaching in thiosulfate solutions

Download Citation | On Jan 1, 2003, Cheng Li published Fundamental aspects of gold leaching in thiosulfate solutions | Find, read and cite all the research you need on ResearchGate...

IN-FIELD TESTING AND VALIDATION OF THIOSULPHATE: A ,

recovery of leachable gold, taking into account the economics of longer leach residency time vs diminishing gold recovery returns This KPI in particular has been met with resounding success—the thiosulphate leaching solution led to an 85% gold recovery rate Note: This project was initiated using vat leaching tanks in the process...

use of thiosulfate in gold leaching

Gold extraction Wikipedia Thiosulfate leaching has been proven to be effective on ores with high soluble copper values or ores which experience preg robbing the absorption by carbonaceous components which preferentially absorbs gold and gold cyanide complexes Leaching through Bulk Leach Extractable Gold or BLEG is also a process that is used to test an area for gold...

Thiosulfate Leaching Of Gold - oldtimer-ig-bad-berleburgde

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...

Gold leaching in thiosulfate solutions and its ,

Thiosulfate is one of the most promising alternative substitutes to cyanide kinetically and environmentallyGold leaching in thiosulfate solutions was evaluated environmentally and kinetically in different ways: (1) applying a closed system to leach gold (2) evaluating the environmental and metallurgical optimum thiosulfate leaching characteristics for pure gold and pure silver and gold ,...

Ammoniacal thiosulphate leaching of gold ore

Ammoniacal thiosulphate leaching of gold finds a better substitute as it is non-toxic and environmentally safe as compared to the toxic cyanide system for gold extraction In the present study, an attempt is made to assess the feasibility of ammoniacal thiosulphate leaching of gold ore samples from two...

An Electrochemical Study of the Dissolution of Pure Gold ,

A fundamental electrochemical study of gold and gold/silver alloys in thiosulfate solutions showed that although the oxidation is a complex process, there was no selective dissolution of either gold or silver from the alloys during oxidation...