a review of thiosulfate leaching of gold

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.

(PDF) A Review of Thiosulfate Leaching of Gold: Focus on ...

A Review of Thiosulfate Leaching of Gold: Focus on Thiosulfate Consumption and Gold Recovery from Pregnant Solution June 2017 Metals - Open Access Metallurgy Journal 7(6):222

Thiosulfate leaching of gold—A review - ScienceDirect

Feb 01, 2001  Thiosulfate leaching of gold--a review 151 5.00E-04 4.00E-04 c 3.00E-04 O C O 2.00E-04 o O 1.00E-04 0.00E+00 -6 Ag(S2Os)3s" Ag(S~Os)~~" -5 -4 -3 -2 Log [NHs] (M) -1 Ag(NHs)~ 0 (a) 5.00E-04 4.00E-04 c 3.00E-04 o ~ 2.00E-04 o 1.00E-04 4 i Ag(NHs)2* J ~S Ag(S2Os)~ 0.00E+00 -6 -5 -4 -3 -2 -1 0 1 log [S2Os2"] (M) (b) Fig.ll Distribution of silver ...

Thiosulfate leaching of gold - A review Request PDF

Feb 25, 2021  The ammoniacal thiosulfate leaching process for gold and silver extraction has been reviewed in terms of leaching mechanism, thermodynamics, thiosulfate stability, and gold

metals-07-00222-v2.pdf - metals Review A Review of ...

metals Review A Review of Thiosulfate Leaching of Gold: Focus on Thiosulfate Consumption and Gold Recovery from Pregnant Solution Bin Xu, Wenhao Kong, Qian Li *, Yongbin Yang, Tao Jiang * and Xiaoliang Liu School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China; [email protected] (B.X.); [email protected] (W.K.); [email protected] (Y.Y.); [email ...

COMPARISON OF CYANIDE AND THIOSULPHATE LEACHING

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

Barrick Thiosulfate Leaching of Double Refractory Ore

The leaching of gold is then accomplished by maintaining a temperature of 50-70⁰C.7 The 2009 Patent15 mentions that the thiosulfate concentration in the leaching container may have to be subsidized with more thiosulfate as the test goes along “to prevent the re- precipitation of gold as its sulfide.” The overall thiosulfate leaching ...

(PDF) Thiosulfate leaching of gold from waste mobile ...

Thiosulfate leaching of gold from waste mobile phones Ha V.H., Lee J.-C., Jeong J., Hai H.T., Jha M.K. Institute for Environmental Science and Technology, Hanoi University of Technology (HUT), 1 - Dai Co Viet, Hanoi, Viet Nam; Mineral Resources Research Division, Korea Institute of Geoscience and Mineral Resources (KIGAM), 92, Gwahang-no, Yuseong-gu, Daejeon 305-350, South Korea; Metal ...

Sodium Thiosulphate Gold Leaching

Mar 17, 2017  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.

THIOSULPHATE LEACHING – AN ALTERNATIVE TO

equivalent rates of gold leaching, and a typical thiosulphate leach solution will have a reagent concentration of 5 to 20 g/L versus a cyanide concentration of only 0.25 to 1 g/L. The higher concentration of thiosulphate required leads to higher reagent consumption, which is at least .

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

(PDF) Thiosulfate leaching of gold from waste mobile ...

Thiosulfate leaching of gold from waste mobile phones Ha V.H., Lee J.-C., Jeong J., Hai H.T., Jha M.K. Institute for Environmental Science and Technology, Hanoi University of Technology (HUT), 1 - Dai Co Viet, Hanoi, Viet Nam; Mineral Resources Research Division, Korea Institute of Geoscience and Mineral Resources (KIGAM), 92, Gwahang-no, Yuseong-gu, Daejeon 305-350, South Korea; Metal ...

(PDF) 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

Ammoniacal thiosulphate leaching of gold ore

thiosulphate leaching of gold finds a better substitute as it is non-toxic and environmentally safe. There are few reports available in the literature on ammoniacal thiosulphate leaching of gold (Yen et al., 1996; Fujita et al., 1997; Breuer and Jeffery, 2000; Navarro et al., 2002). An excellent review

Effect of additives on thiosulfate leaching of a gold ore

In a resin-in-leach system, full gold recovery was also achievable with sufficient resin after 24 h leach with 0.06 M fresh ammonium thiosulfate and 2 mM EDTA at an agitation speed of 250 r/min. Key words: Gold leaching, Thiosulfate, Additives, Leaching kinetics, Thiosulfate stability

[PDF] Gold leaching by copper(II) in ammoniacal ...

Gold leaching by copper(II) in ammoniacal thiosulphate solutions in the presence of additives. Part I: A review of the effect of hard–soft and Lewis acid-base properties and interactions of ions @article{Senanayake2012GoldLB, title={Gold leaching by copper(II) in ammoniacal thiosulphate solutions in the presence of additives.

Adsorption of gold in gold-thiosulfate solution onto a ...

1.Introduction. Gold is commonly extracted via cyanide leaching , but this technique produces highly-toxic cyanide pollution.Due to increasing environmental protection awareness, cyanide-free leaching methods have been proposed by many scholars , , , .Thiosulfate-gold leaching provides a simple and nontoxic method that has a good gold leaching effect and fast gold leaching speed; thus, it has ...

Thiosulfate Leaching of Gold and Silver from Waste Mobile ...

Thiosulfate leaching of gold and silver from waste mobile phones were investigated, the results indicated that gold and silver contents of waste mobile phones were 0.211mg/g, 0.67mg/g, respectively.

Thiosulphate Leaching SGS

Thiosulfate leaching offers a number of benefits related to gold recovery yields and environmental concerns: Thiosulfate leaching of gold ores has great potential to reduce the impact on the environment. Unlike cyanide, which is highly toxic, the chemicals used in the thiosulfate leaching process are benign.

A review of factors affecting gold leaching in non ...

A review of factors affecting gold leaching in non-ammoniacal thiosulfate solutions including degradation and in-situ generation of thiosulfate O. Sitandoa,b, G. Senanayakea,*, X. Daib, A.N. Nikoloskia, P. Breuerb aChemical Metallurgical Engineering Chemistry, Murdoch University, 90 South Street, Murdoch, Perth WA6150, Australia

(PDF) A Review on Alternative Gold Recovery Reagents to ...

The most tested leaching agents for gold are thiosulfate, thiourea, thiocyanate and halides [19][20] [21]. An effective Au recovery process from mining wastes could provide new resources for ...

The treatment of copper-gold ores by ammonium thiosulfate ...

The application of ammonium thiosulfate for the treatment of copper-gold ores has been investigated. Leaching studies were conducted with copper minerals, copper minerals with gold addition to solution and copper-gold samples of different copper and gold grades. The behaviour of thiosulfate, tetrathionate and sulfate in solution was studied using ion chromatography. The copper sulfide

US6632264B2 - 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 thiosulfate solution prior to contacting with an

A review of ammoniacal thiosulfate leaching of gold: An ...

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. The leaching results of different types of gold ores including oxide, sulfide, carbonaceous, and refractory ores/concentrates and the ...

FUNDAMENTAL ASPECTS OF GOLD LEACHING IN

2 LITERATURE REVIEW 4 2.1 Aqueous Chemistry 4 2.2 Stability of thiosulfate solution 16 2.3 Leaching of gold in thiosulfate system 19 2.4 Research on the kinetics and mechanism 25 2.4.1 Passivation phenomena 25 2.4.2 Kinetics study of gold thiosulfate leaching 27 2.4.3 Mechanism of gold thiosulfate leaching 37 2.5 Additives studies 44 3.

A review of factors affecting gold leaching in non ...

A review of factors affecting gold leaching in non-ammoniacal thiosulfate solutions including degradation and in-situ generation of thiosulfate O. Sitandoa,b, G. Senanayakea,*, X. Daib, A.N. Nikoloskia, P. Breuerb aChemical Metallurgical Engineering Chemistry, Murdoch University, 90 South Street, Murdoch, Perth WA6150, Australia

Leaching and recovery of gold using ammoniacal thiosulfate ...

A review is presented summarising the leaching of gold with ammoniacal thiosulfate solutions, and evaluating the current use and development of ion exchange resins for the recovery of gold and silver from such leach liquors. Comparisons are also made with other recovery processes, including carbon adsorption, solvent extraction, electrowinning and precipitation.

(PDF) Review Gold leaching by copper(II) in ammoniacal ...

Review Gold leaching by copper(II) in ammoniacal thiosulphate solutions in the presence of additives. Part I: A review of the effect of hard–soft and Lewis acid-base properties and interactions of ions

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 this study. The effect of concentration of different reagents, applied potential, pH, temperature, and electrode rotating ...

Adsorption of gold in gold-thiosulfate solution onto a ...

1.Introduction. Gold is commonly extracted via cyanide leaching , but this technique produces highly-toxic cyanide pollution.Due to increasing environmental protection awareness, cyanide-free leaching methods have been proposed by many scholars , , , .Thiosulfate-gold leaching provides a simple and nontoxic method that has a good gold leaching effect and fast gold leaching speed; thus, it has ...

Effect of Silver in Thiosulfate Leaching of Gold–Silver ...

One promising alternative to cyanide for the leaching of gold is thiosulfate due to its low toxicity and efficiency in leaching gold from low-grade and carbonaceous ores and concentrates. Much of the published research focuses to optimizing the reagent concentrations to develop a suitable process for industrial applications. However, there are few studies on the effect of silver content on ...

P H O P Invited Review A review of gold extraction using ...

Currently, the ammoniacal leaching and nonammoniac-al thiosulfate leaching of gold are being extensively studied, and several studies on the leaching of gold using polysulf-ide solutions have also been published. However, no spe-cialized review for sulfur-containing leaching agents has

WO2011154607A1 - Method of gold leaching - Google Patents

A process for recovering gold from gold-bearing raw material is provided. The method comprises a step of leaching the raw material in leach solution comprising thiosulphate anions and trace amount of

Sodium thiosulfate - Wikipedia

Sodium thiosulfate (sodium thiosulphate) is an inorganic compound with the formula Na 2 S 2 O 3. x H 2 O. Typically it is available as the white or colorless pentahydrate, Na 2 S 2 O 3 5H 2 O.The solid is an efflorescent (loses water readily) crystalline substance that dissolves well in water.. Sodium thiosulfate is used in gold mining, water treatment, analytical chemistry, the development ...

The Mechanisms of Thiosulfate Toxicity against ...

Apr 22, 2021  Breuer, P.L.; Jeffrey, M.I. The reduction of copper (II) and the oxidation of thiosulfate and oxysulfur anions in gold leaching solutions. Hydrometallurgy 2003, 70, 163–173. [Google Scholar] Packer, L.; Mustafa, M.G. Pathways of electron flow established by tetramethyl-phenylenediamine in mitochondria and ascites tumor cells. BBA-Enzymol.

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