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of thiosulfate in 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.

THIOSULPHATE LEACHING – AN ALTERNATIVE TO CYANIDATION IN GOLD ...

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 the ...

Ammoniacal thiosulphate leaching of gold ore

leaching of gold as its absence makes gold passive by the build up of sulphur coating on the surface as a result of decomposition of thiosulphate. It is known that thiosulphate is a meta-stable species that readily undergoes decomposition in aqueous solut ...

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 ions high gold recoveries can be obtained from the thiosulfate leaching of complex and carbonaceous-type ores. In addition thiosulfate can be cheaper than cyanide.

Thiosulfate leaching of gold - A review Request PDF

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 ions high ...

Anaerobic thiosulfate leaching: Development of in situ gold ...

The gold concentration after six days was similar for the oxalate system with 50 mM thiosulfate 59.4 mg/L gold and the EDTA system with 100 mM thiosulfate 54.4 mg/L gold . The corresponding average leach rates are 0.25 and 0.22 μmol/m 2 s respectively more than an order of magnitude faster than the highest anaerobic leach rate measured in the absence of thiourea.

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

Thiosulphate Leaching SGS

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

Fundamental aspects of gold leaching in thiosulfate solutions ...

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 hodic polarization and leaching experiments were included in this study. The effect of concentration of different reagents applied potential pH temperature and electrode rotating ...

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 NH4 2S2O3 0.03M CuSO4 and 3M NH3 at pH 10.2 for 24 hours. In the testing thiosulfate consumption was 30 kg/t of ore. Dissolved ...

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