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Leaching Gold From Ore With Thiosulfate

Thiosulphate Leaching | SGS

Thiosulphate Leaching 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. We are a global technical leader in the field of thiosulfate leaching.THIOSULPHATE LEACHING – AN ALTERNATIVE TO CYANIDATION IN GOLD . as preg-robbing ores (naturally occurring carbonaceous material that preferentially absorbs the gold cyanide complex but not the gold thiosulphate complex), it can yield substantially better recovery than cyanide. • The thiosulphate leaching of gold ores has great potential to reduce the impact on the environment compared to the cyanidation .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.

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 .(PDF) Ammoniacal thiosulphate leaching of gold ore The ammoniacal thiosulphate leaching of gold is dependant on both ammonia and thiosulphate concentration. The leaching is improved significantly at a particular ratio of ammonia to thiosulphate.Ammoniacal thiosulphate leaching of gold ore the leaching systems were fluctuating 150−160 and 170−180mV vs. SHE respectively. The times of leaching were restricted for about 5h for the rest of the leaching experiments. Figure 1. Ammoniacal thiosulphate leaching of Akeshi and Hishikari gold ores a) as a function of time and b) as a function of pH and E

A study of thiosulfate leaching of gold from carbonaceous ore .

It was also shown that thiosulfate will leach gold from oxide ores but not as effectively as cyanide. While a high percent extraction of gold was obtained from the carbonaceous ore, poor recovery of gold was observed from the sulfide ore, which is also a refractory ore as is the carbonaceous ore.A study of thiosulfate leaching of gold from carbonaceous ore . A comparison of thiosulfate with cyanide leaching of gold from carbonaceous ore showed that thiosulfate is chemically better and economically more advantageous. Description Online access for this thesis was created in part with support from the Institute of Museum and Library Services (IMLS) administered by the Nevada State Library, Archives .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 cations, high .

Ammoniacal thiosulfate leaching of gold from a refractory ore .

CONCLUSION In this study, thiosulfate-ammonia-copper leaching of gold from the refractory Kaletaş ore as an alternative to cyanide leaching was evaluated using a 23 full factorial design. The highest gold extraction of 68.8% was achieved in the presence of 1.0 M Na2S2O3, 0.05 M CuSO4 and 1.0 M NH3.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 Leaching of Middle-Refractory Gold Ore with . Leaching of middle-refractory gold ore show that both of the consumption of thiosulfate and leaching rate was decreased compare to the traditional copper–ammonia thiosulfate system. Thiourea is not stable in base solution, but it was found that gold dissolution rates can be increased with a little thiourea ,the mechanism is still unclear.

Biooxidation-thiosulfate leaching of refractory gold .

A process of biooxidation followed by thiosulfate leaching of gold from refractory gold concentrate was investigated. Mineralogical studies on the concentrate showed that very fine gold grains (<10 µm) were encapsulated in pyrite and arsenopyrite, while the proportion of monomer gold was only 21%. The gold-bearing sample was identified as a high-sulfur fine-sized wrapped-type refractory .A study of thiosulfate leaching of gold from carbonaceous ore . A comparison of thiosulfate with cyanide leaching of gold from carbonaceous ore showed that thiosulfate is chemically better and economically more advantageous. Description Online access for this thesis was created in part with support from the Institute of Museum and Library Services (IMLS) administered by the Nevada State Library, Archives .Ammoniacal thiosulfate leaching of gold from a refractory ore . CONCLUSION In this study, thiosulfate-ammonia-copper leaching of gold from the refractory Kaletaş ore as an alternative to cyanide leaching was evaluated using a 23 full factorial design. The highest gold extraction of 68.8% was achieved in the presence of 1.0 M Na2S2O3, 0.05 M CuSO4 and 1.0 M NH3.

GOLD LECHING FROM A SAUDI ORE BY THE NONPOLLUTING THIOSULFATE .

leaching in the ammoniacal thiosulfate solution. Gold leaching drastically decreased as the concentration of copper(II) increased 0.2 mM due to the degradation of S 2 O 3 2-. Keywords: gold, extraction, leaching, thiosulfate, Saudi ore Introduction Gold dissolution in an alkaline cyanide solution was first reported by Elsner in 1846.The role of ligands and oxidants in thiosulfate leaching of gold the thiosulfate leaching of gold has been carried out at high temperatures up to 80°C and at oxygen partial pressures up to 100 psig (19). For example, a carbonaceous ore of gold grade 9-10 Au g/t contained 81.8% of gold associated with Gold Bulletin 2005 • 38/4 171 Figure 1 Effect of additives (0.1 M) on gold extraction and thiosulfateThiosulphate Stability In Gold Leaching Process Ammonium thiosulphate is an alternative gold leaching Laaviant used to replace cyanide. 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

The modes of gold loss in the calcium thiosulfate leaching .

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 .GOLD LECHING FROM A SAUDI ORE BY THE NONPOLLUTING THIOSULFATE . leaching in the ammoniacal thiosulfate solution. Gold leaching drastically decreased as the concentration of copper(II) increased 0.2 mM due to the degradation of S 2 O 3 2-. Keywords: gold, extraction, leaching, thiosulfate, Saudi ore Introduction Gold dissolution in an alkaline cyanide solution was first reported by Elsner in 1846.Thiosulphate Stability In Gold Leaching Process Ammonium thiosulphate is an alternative gold leaching Laaviant used to replace cyanide. 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

Effect of additives on thiosulfate leaching of a gold ore

S.J. Dai et al.: Effect of additives on thiosulfate leaching of a gold ore 50 The leaching of sulfide minerals increased with the addition of EDTA, as reflected by the increased sulfur concentration in solution. CMC slightly increased gold recovery at low concentration but hindered gold leaching at a high concentration. AtThe modes of gold loss in the calcium thiosulfate leaching . 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 .Using Nickel as a Catalyst in Ammonium Thiosulfate Leaching . On a 100 mass%-75 μm of silicate type gold ore containing 16 g/t Au and 0.2 mass% of Fe and C, the nickel catalyzed ammonium thiosulfate solution could extract 95% of gold with the 1.2 kg/t-ore of ammonium thiosulfate consumption in 24 hours at the most favorable reagent combination of 0.0001 mol/dm 3 NiSO 4, 0.05 mol/dm 3 (NH 4) 2 S 2 O 3 and .

Gold extraction - Wikipedia

If the gold can not be concentrated for smelting, then it is leached by an aqueous solution: . The cyanide process is the industry standard.; Thiosulfate leaching has been proven to be effective on ores with high soluble copper values or ores which experience preg-robbing: the absorption by carbonaceous components which preferentially absorbs gold and gold-cyanide complexes.

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