Thiosulphate Leaching Of Gold From Ores

THIOSULPHATE LEACHING – AN ALTERNATIVE TO CYANIDATION …

• The thiosulphate leaching of gold ores has great potential to reduce the impact on the environment compared to the cyanidation process. Unlike cyanide, which is highly toxic, the chemicals used in the thiosulphate leaching process are benign, and there is great potential to apply the technology in those jurisdictions of the world where the use of cyanide is banned outright, or is subject ...

Ammoniacal thiosulphate leaching of gold ore

The ammoniacal thiosulphate leaching of two gold ore samples namely Akeshi and Hishikari was carried out as a function of time and the results are given in Figure 1a. In this experiment, the thiosulphate and ammonia concentrations were kept at 0.5 and 1M respectively. The solid concentrations of the ores were kept at 40% and the stirrer was maintained at a speed of 400rpm. As …

Thiosulphate Leaching | SGS

Thiosulphate Leaching. Thiosulfate leaching is a process that recovers gold from ore without the use of cyanide. Read more. 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. Our laboratory and industry experts have ...

Sodium Thiosulphate Gold Leaching

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 there are also ...

Gold strike with thiosulphate - CSIRO

The first gold bar produced with the thiosulphate process was poured in late 2014 at Barrick’s Goldstrike plant in Nevada, USA and operations are ramping up to recover gold from four million tonnes of stockpiled ore that was uneconomic to process by traditional methods. CSIRO's Danielle Hewitt, who worked at the Barrick demonstration plant to develop and prove the Barrick-CSIRO technology ...

Thiosulphate Leaching | SGS

Thiosulphate Leaching. Thiosulfate leaching is a process that recovers gold from ore without the use of cyanide. Read more. 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. Our laboratory and industry experts have ...

Gold strike with thiosulphate - MINING.COM

2015-06-19· Thiosulphate has long been seen as a potential alternative to cyanide for liberating gold from ores, but until now it has proved difficult to master. Cyanide is highly toxic and an environmental ...

Thiosulphate Leaching | SGS Chile

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. This technology offers great potential in those jurisdictions where the use of cyanide is banned outright, or is subject to intense negative publicity for environmental reasons ; This process ...

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.

Thiosulphate leaching for gold hydrometallurgy - …

1995-10-01· Ammoniacal thiosulphate solution allows the solubilization of gold as stable anionic complex. Leaching of gold occurs at appreciable dissolution rates. The aim of this work is devoted to a preliminary evaluation of the feasibility of thiosulphate leaching for the extraction of gold from precious metals ores on a laboratory scale. The ...

Thiosulphate as an alternative to cyanide for gold …

2013-07-18· Thiosulphate is an attractive alternative reagent to cyanide for processing gold ores. It is relatively cheap and non-toxic, forms relatively strong gold and silver complexes, and readily leaches gold ores in ammoniacal solutions, catalysed by Cu(II). It is particularly suited to carbonaceous ores where the recovery of gold by cyanide is poor. However, research over the past 20 years has ...

(PDF) Leaching of OvacIk gold ore with cyanide, …

The use of ammonium thiosulphate as leaching agent for gold from a flotation concentrate has been studied. The gold content in the concentrate was 95 g/t, whereas the main mineralogical species ...

The modes of gold loss in the calcium thiosulfate …

The processing of gold is becoming more complicated due to the increasingly complex nature of the remaining gold-bearing ore bodies. This worldwide phenomenon is the driving force for the development of alternative technologies for the leaching and recovery of gold from so-called double refractory ores. Barrick Gold recently commercialized a unique calcium thiosulfate leaching plant to treat ...

L.R. Freitas, R.B.E. Trindade and T. Carageorgos

THIOSULPHATE LEACHING OF GOLD-COPPER ORES FROM IGARAPE BAHIA MINE (CVRD) L.R. Freita/. R.B.E. Trindade2 and T. Carageorgos3 1Centre of Technology, Companhia Vale do Rio Doce, Santa Luzia-MO, Brazil [email protected] 2CETEM/MCT, Rio de Janeiro-RJ, Brazil [email protected] 3LENEP/UENF, Macaé-RJ, [email protected] ABSTRACT …

IN-FIELD TESTING AND VALIDATION OF THIOSULPHATE: A REPLACEMENT FOR CYANIDE IN GOLD …

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. Continued analysis and the associated learnings has led us to introduce the use of agitated tanks into the process. This has resulted in even greater recovery rates. As such, this new ...

Thiosulphate as an alternative to cyanide for gold …

2013-07-18· Thiosulphate is an attractive alternative reagent to cyanide for processing gold ores. It is relatively cheap and non-toxic, forms relatively strong gold and silver complexes, and readily leaches gold ores in ammoniacal solutions, catalysed by Cu(II). It is particularly suited to carbonaceous ores where the recovery of gold by cyanide is poor. However, research over the past 20 years has ...

EXTRACTION OF GOLD AND SILVER FROM TURKISH GOLD …

Thiosulphate leaching of precious metals is one of the processes that were developed as an alternative and nontoxic technique to conventional cyanidation. The aim of this experimental study was to investigate the possibilities of leaching gold and silver in ammoniacal thiosulphate solutions on a laboratory scale. Samples used in the experiments were taken from Ovacık Gold Mine, located in the ...

Thiosulphate Leaching | SGS Chile

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. This technology offers great potential in those jurisdictions where the use of cyanide is banned outright, or is subject to intense negative publicity for environmental reasons ; This process ...

(PDF) Thiosulphate leaching for gold hydrometallurgy | …

The thiosulphate concentration was determined by iodometric titration. The pH of the pulp ranged from 8.5 to 10.5.Adsorption studies were carried out with the actual ammoniacal thiosulphate solution coming from the leaching of the gold ore sample. The gold concentration of the solution was in the range from 2 mg/l to 16.60 mg/1 and the pH was ...

Barrick Thiosulfate Leaching of Double Refractory Ore

In general, the cyanide solution pulls the gold out of the ore and into solution. However, when the standard cyanide leaching solution is used to recover gold from double refractory ores instead of single refractory ores, gold has a strong affinity for the carbon in the ore slurry along with the activated carbon used to capture the gold in solution and thus, can be lost through the tails. This ...

Leaching Kinetics of Gold Involved in the System S2O32- …

Thiosulphate gold leaching is an alternative technology to the cyanidation of gold ores. Ethylenediaminetetraacetic acid is referred to as EDTA.A study on the leaching kinetics of gold involved in the system S 2 O 3 2--EDTA-Cu 2+ for the gold in this paper. The effect of temperature and of the addition of copper has been also analyzed, temperature has a remarkable effect over the overall ...

The modes of gold loss in the calcium thiosulfate …

The processing of gold is becoming more complicated due to the increasingly complex nature of the remaining gold-bearing ore bodies. This worldwide phenomenon is the driving force for the development of alternative technologies for the leaching and recovery of gold from so-called double refractory ores. Barrick Gold recently commercialized a unique calcium thiosulfate leaching plant to treat ...

Thiosulphate Leaching | SGS South Africa

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. This technology offers great potential in those jurisdictions where the use of cyanide is banned outright, or is subject to intense negative publicity for environmental reasons ; This process ...

(PDF) Conference Proceeding: AMMONIACAL …

Keywords: Leach, thiosulphate, copper-gold ore, gold, Taguchi design (received 31 March 2011, accepted 2 May 2011) Introduction Cyanide is the most preferable leaching agent since it forms strong complexes with gold. Due to high toxicity of cyanide and, hence, stringent environmental regulations, there has been growing interest on alternative lixiviants such as thiosulphate, thiourea ...

Thiocyanate leaching of gold - UBC Library Open …

This study focused on evaluating sodium thiocyanate as an alternative reagent to the conventional cyanidation process for leaching of gold ores. Goldcorp’s Coffee project in Yukon-Canada supplied three mineral samples namely, Supremo Oxide 68151, Supremo oxide 68151, Supremo Composite 72142 for this study. As a baseline for comparison with thiocyanate extraction results, cyanidation …

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