Improvement of thiosulfate stability in gold leaching

Ammonium thiosulfate is a noncyanide lixiviant for gold leaching. However, the major problem with this leaching method has been the high consumption of reagents. To leach a mild refractory copper bearing gold ore, the authors used a reagent combination of 0.3M (NH 4 ) 2 S 2 O 3 , 0.03M CuSO 4 and 3M NH 3 at pH 10.2 for 24 hours.

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Sodium Thiosulphate Gold Leaching

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.

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A review Request PDF ResearchGate

Thiosulfate leaching of gold A review. Another alternative that has been studied (in the laboratory) in previous works on the leaching of silver in sulfide or metal form with thiosulfate, is the addition of metal ions Zn 2+ and Cu 2+ , where these two oxidize the noble metals while thiosulfate

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THIOSULPHATE LEACHING AN ALTERNATIVE TO

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.

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Thiosulfate leaching of goldA review ScienceDirect

The thiosulfate leaching process it catalysed by copper and has several advantages over the conventional cyanidation process. 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

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Mining SGS sgs

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.

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Gold leaching by organic base polythionates new non toxic

Polythionates in the gold leaching. After the highly basic anion exchanger regeneration, it is transferred to the process of the thiosulfate gold complex sorption. The technical advantage resides in a faster leaching, a higher gold yield and a lower consumption of the leaching agent.

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Effect of additives on thiosulfate leaching of a gold ore

Effect of additives on thiosulfate leaching of a gold ore *S.J. Dai, P.C. Li, Q.Q. Wang , D.W. Feng University of Science and Technology, Liaoning, Anshan, China Received August 15, 2017, Revised November 15, 2017 The effect of additives on gold leaching was investigated using ammonium thiosulfate or calcium thiosulfate.

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Thiosulfate leaching of goldA review ScienceDirect

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 discussed.

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