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Ammoniacal thiosulphate leaching of gold ore

2016-6-2 · Ammoniacal thiosulphate leaching of gold finds a better substitute as it is non-toxic and environmentally safe as compared to the toxic cyanide system for gold extraction. In the present study, an attempt is made to assess the feasibility of ammoniacal thiosulphate leaching of gold ore samples from two

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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. The thiosulphate leaching process, followed

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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.

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Thiosulphate leaching of gold in the presence of

2011-1-1 · Gold leaching in ammoniacal thiosulphate solutions is an electrochemical reaction, with the constituent half reactions being the oxidation of gold to gold thiosulphate, and the reduction of the cupric tetra-amine to the cuprous thiosulphate, as expressed in Eqs.

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The copper–ethanediamine–thiosulphate leaching of

2014-12-1 · The leaching of thiosulphate gold for a gold ore containing limonite was investigated. The results indicate that the copper ion–ethanediamine (en)–thiosulphate system was more suitable than the copper ion–ammonia–thiosulphate system for gold extraction of the gold ore. The use of cetyltrimethyl ammonium bromide (CTAB) as an effective synergistic

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Oxidative pre-treatment in thiosulphate leaching of

2010-2-19 · Thiosulphate gold leaching has received much attention as an alternative technology to the cyanidation of gold ores in recent years due to the growing environmental and public concerns over the use of cyanide. Acceptable gold leaching rates using thiosulphate have been achieved in the presence of ammonia with cupric ion acting as the oxidant.

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Sodium Thiosulphate Gold Leaching 911 Metallurgist

2016-6-2 · 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

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Effect of additives on thiosulfate leaching of a gold ore

2018-3-24 · thiosulfate leaching of gold and the stability of thiosulfate and gold thiosulfate species. Specifically, sulfide minerals retard gold leaching and catalyse the degradation of thiosulfate and gold thiosulfate. Other reductants, e.g. carbonaceous matter, have also been found to affect the stability of thiosulfate and gold thiosulfate.

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Biooxidation‒thiosulfate leaching of refractory gold

2019-7-21 · Abstract: 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...

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COMPARISON OF CYANIDE AND THIOSULPHATE

2016-6-2 · Feng and van Deventer (2010) studied oxidative pretreatment in thiosulphate leaching of sulphide gold ores. The sulphide minerals were partially decomposed in the pretreatment process and thiosulphate consumption was reduced during leaching. Gold extraction in 0.8

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Thiosulphate Leaching SGS China

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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(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 10.5.

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Effect of additives on thiosulfate leaching of a gold ore

2018-3-24 · leaching of a gold ore, i.e. EDTA, carboxy methyl odium dodecyl sulfate (SDS) was investigated. EXPERIMENTAL Materials A milled gold ore sample with a solid content of 50% was provided by a gold mine and used in the leaching tests without further treatment. The gold ore sample was a refractory ore mainly containing 6

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Thiosulphate Stability In Gold Leaching Process

2004-11-29 · gold ore to 62% with a thiosulphate consumption of 19kg/t.Sulphate addition could not ùnprove the thiosulphate stability significantiy, Gold Ieachmg at high pulp density (62%) produced the same gold extraction and greatiy reduced the thiosulphate consumption to 13kg/t. The mnieral content of the ore dso infiuenced the gold

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Thiosulphate leaching of gold in the presence of

After 48 h leaching of the sulphide gold ore, the thiosulphate consumption decreased from 8.15 kg/t under the standard leach conditions to 7.41, 5.19 and 4.08 kg/t with the addition of orthophosphate at 0.4, 1.0 and 8.2 g/L, respectively (Fig. 9b).

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Improvement of thiosulfate stability in gold leaching

2003-5-1 · 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.

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Thiosulphate as an alternative to cyanide for gold

2013-7-18 · 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.

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EXTRACTION OF GOLD AND SILVER FROM TURKISH

2007-11-14 · 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

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IN-FIELD TESTING AND VALIDATION OF THIOSULPHATE:

2020-4-29 · recovery of leachable gold, taking into account the economics of longer leach residency time vs. diminishing gold recovery returns. 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.

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Gold strike with thiosulphate MINING.COM

2015-6-19 · As part of the thiosulphate process at Goldstrike, gold-bearing ore is heated as a thick slurry of ore, air, water and limestone in large pressure chambers or autoclaves and then pumped into the

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