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leaching gold ore thiosulphate

Sodium Thiosulphate Gold Leaching - 911 Metallurgist

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...

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thiosulphate leaching – an alternative to cyanidation in gold - SGS

Thiosulphate leaching is a process that removes gold from gold bearing ores without the use of cyanide. Although not as aggressive a leaching agent as cyanide, thiosulphate offers several technological advantages including its lower toxicity and greater efficiency with gold deposits associated with preg-robbing ores. The.

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alkaline cyanide or thiosulphate solution and consume reagent and oxygen. Certain sulfide minerals are characteristically associated with gold, and the most important are pyrite, chalcopyrite, pyrrhotite, galena and arsenopyrite (Habashi, 1999). All sulfide minerals contain sulfide (S. 2-. ) anion. Before leaching the gold, ore...

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A Review of Thiosulfate Leaching of Gold: Focus on ... - MDPI

Jun 15, 2017 ... a copper bearing gold ore. The main reasons for excessive thiosulfate consumption are as follows: thiosulfate itself is metastable and easily oxidized by Cu(II) and, furthermore, certain associated minerals can accelerate its oxidation [7,14]. 2.1. Electrochemical-Catalytic Mechanism of Thiosulfate Leaching.

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Leaching of Ovacık gold ore with cyanide, thiourea and thiosulphate ...

In this study, leaching kinetics of Ovacık gold ore, which is the first project of what is potentially a large new mining industry in Turkey, has been investigated and major parameters have been determined using cyanide, thiourea and thiosulphate. The dissolution of gold is discussed in terms of extraction rates and reagent...

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Thiosulphate leaching for gold hydrometallurgy -

leaching for the extraction of gold from precious metals ores on a laboratory scale. The experimental work has allowed the authors to point out the influence of temperature, thiosulphate concentration, ammonia concentration and copper sulphate concentration on the gold dissolution from an ore (51.6 g/t Au) that originated...

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Thiosulphate Stability In Gold Leaching Process - Bibliothèque et ...

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. A low-grade mild refiacto ry copper-bearing gold ore.

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Thiosulfate leaching of gold - A review - ResearchGate

Nov 30, 2017 ... Request (PDF) | Thiosulfate leaching... | 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. The application to different ore types and process options have also been...

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1 INTRODUCTION. A growing interest has emerged in leach- ing gold with thiosulfate solution, instead of cyanide-dependent methods yielding high gold recoveries, without toxicity and at a fast leach~ ing rate. Particulary, for sulfide gold ores am- moniacal thiosulfate method has some advan- tages ofits own. ' Over the past...

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Patent US6632264 - Gold recovery from thiosulfate leaching ...

Oct 14, 2003 ... 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...

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