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ammonium thiosulfate mineral processing gold leaching

Ammoniacal thiosulphate leaching of gold ore

2016-6-2  The ammoniacal thiosulphate leaching of two gold ore samples namely Akeshi and Hishikari was carriedout as a function of time and the results are given in Figure 1a. In this experiment, the thiosulphate andammonia concentrations were kept at 0.5 and 1M respectively. The solid concentrations of the ores werekept at 40% and the stirrer was maintained at a speed of 400rpm. As can be seen from the figure, Auleaching increases with increase in time for both the samples. It is also noticed that the Au leaching is littlehigher with Akeshi sample for the first two hour of leaching and the trend reverses beyond 2h of leaching.The pH and Eh changes of these leaching systems are presented in Figure 1b. The pH changes are veryminimum almost remains constant at around 11.2−11.4 for both the samples as a function of time. The Eh ofthe leaching systems were fluctuating 150−160 and 170−180mV vs. SHE respectively. The times ofleaching were restricted for about 5h for the rest of the leaching

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Ammonium thiosulfate extraction of gold from printed ...

2020-1-1  In this study, the ammonium thiosulfate leaching of gold (Au) from printed circuit boards (PCBs) of end-of-life mobile phones and the subsequent recovery of dissolved metals from pregnant leach solution via cementation were elucidated under various conditions.

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The treatment of copper–gold ores by ammonium thiosulfate ...

2002-10-1  Copper minerals and copper–gold samples were leached in an ammonium thiosulfate solution under varying experimental conditions, i.e. aeration, temperature and reagent addition. The behaviour of thiosulfate, tetrathionate and sulfate in solution was studied using ion chromatography.

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Ammoniacal thiosulfate leaching of refractory oxide gold ...

2017-7-10  Besides, ammonia is an integral part of thiosulfate leaching of gold as it prevents the thiosulfate decomposition in aqueous solutions. In the absence of ammonia, thiosulfate decomposes and forms a sulfur coating on the surface of ore particles which leads to the gold passivation.

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(PDF) Ammoniacal thiosulphate leaching of gold ore

Abstract. 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 ...

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Thiosulphate Stability In Gold Leaching Process

2004-11-29  Ammonium thiosulphate is an alternative gold leaching Laaviant used to replace cyanide.

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The treatment of copper–gold ores by ammonium thiosulfate ...

Copper minerals and copper–gold samples were leached in an ammonium thiosulfate solution under varying experimental conditions, i.e. aeration, temperature and reagent addition. The behaviour of thiosulfate, tetrathionate and sulfate in solution was studied using ion chromatography.

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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 by resin-in-pulp gold extraction, has been developed by SGS to the point where it is a technically and economically viable alternative to cyanidation for some gold

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(PDF) Ammoniacal thiosulfate leaching of gold from a ...

Statistical analysis confirmed the leaching of gold improved with increasing concentrations of thiosulfate and ammonia. In contrast, increasing the concentration of copper in the range

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Thermodynamic analysis of gold leaching by ammoniacal ...

2001-11-1  Thiosulfate offers a nontoxic alternative to cyanide for processing gold ores. The mechanism of leaching gold using ammoniacal thiosulfate solution is driven by the Cu (II)-Cu (I) redox couple and is complicated by competing ligands such as NH 3 and S 2 O 32−.

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(PDF) Ammoniacal thiosulphate leaching of gold ore

Abstract. 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 ...

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Dissolution of Gold and Silver with Ammonium Thiosulfate ...

2017-4-20  A novel process was studied to extract economic metals from refractory ores that are difficult to leach with cyanide and ammonium thiosulfate, such as the well-known mangano argentiferous minerals, which are minerals of manganese, iron, and silver. The mineral under consideration originates from the tailings of the Monte del Favor, Hostotipaquillo Jalisco, Mexico. The sample was characterized ...

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ammonium thiosulfate leaching gold - jcc2019.cl

Here is a more scientific explanation of thiosulfate leaching. Inquire Now; Ammonium Thiosulfate Google Groups. Apr 05, 2010 We have had some success with Ammonium Thiosulfate leaching gold and silver from Honduras ores. Problem: the out-gassing of . Inquire Now; Sodium thiosulfate for small-scale gold leaching

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(PDF) Ammoniacal thiosulfate leaching of gold from a ...

In this study, leaching of gold from the refractory Kaletaş ore (in which gold/silver alloy is the only mode of occurrence detected) in ammoniacal thiosulfate solutions was studied. A two-level ...

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Thermodynamic analysis of gold leaching by ammoniacal ...

2001-11-1  Thiosulfate offers a nontoxic alternative to cyanide for processing gold ores. The mechanism of leaching gold using ammoniacal thiosulfate solution is driven by the Cu(II)-Cu(I) redox couple and is complicated by competing ligands such as NH 3 and S 2 O 3 2−.It is shown that an understanding of the copper speciation and sulfur speciation is required to optimize this system.

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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. Dissolved ...

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The treatment of copper-gold ores by ammonium thiosulfate ...

The application of ammonium thiosulfate for the treatment of copper-gold ores has been investigated. Leaching studies were conducted with copper minerals, copper minerals with gold addition to solution and copper-gold samples of different copper and gold grades. The behaviour of thiosulfate, tetrathionate and sulfate in solution was studied using ion chromatography. The copper sulfide minerals ...

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Leaching of Sludge from the AVR Process with

2015-5-31  Studies have been reported leaching with ammonium thiosulfate values of some minerals of this class [6],[7]. In this work, a product of the neutralization process AVR material, also known as acidification, volatilization and neutralization was studied. The aim of this work is to retrieve the values of gold

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Thiosulfate-copper-ammonia leaching of pure gold and ...

2017-5-10  Keywords: gold leaching, thiosulfate, quartz crystal microbalance Introduction The industrially applied leaching method for gold ores and concentrates involves the use of cyanide as a ligand for dissolution of gold. Cyanide is technically and economically a viable method for gold processing

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THE STUDY OF THE KINETICS OF GOLD LEACHING IN THE

2020-8-11  The gold leaching rate in ammonium thiosulfate in the presence of copper species is mainly controlled by the cathodic process, which is under diffusion or mixed kinetics control. The results of the rotating gold disk leaching study are consistent with those from the electrochemical study. The gold leaching process in ammonium

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(PDF) Ammoniacal thiosulphate leaching of gold ore

Abstract. 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 ...

More

Dissolution of Gold and Silver with Ammonium Thiosulfate ...

2017-4-20  A novel process was studied to extract economic metals from refractory ores that are difficult to leach with cyanide and ammonium thiosulfate, such as the well-known mangano argentiferous minerals, which are minerals of manganese, iron, and silver. The mineral under consideration originates from the tailings of the Monte del Favor, Hostotipaquillo Jalisco, Mexico. The sample was characterized ...

More

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. Dissolved ...

More

Leaching of Sludge from the AVR Process with

2015-5-31  Studies have been reported leaching with ammonium thiosulfate values of some minerals of this class [6],[7]. In this work, a product of the neutralization process AVR material, also known as acidification, volatilization and neutralization was studied. The aim of this work is to retrieve the values of gold

More

Thiosulfate-copper-ammonia leaching of pure gold and ...

2017-5-10  Keywords: gold leaching, thiosulfate, quartz crystal microbalance Introduction The industrially applied leaching method for gold ores and concentrates involves the use of cyanide as a ligand for dissolution of gold. Cyanide is technically and economically a viable method for gold processing

More

Thiosulfate Leaching Process for Gold Extraction

2017-2-20  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

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GOLD LECHING FROM A SAUDI ORE BY THE

2014-9-8  thiosulfate leaching of gold (Chen, 2008). This shows how much a mineralogical investigation is important to be performed before leaching study of any gold ore by the thiosulfate process. Several gold localities are scattered in the Arabian Shield of the kingdom of Saudi Arabia which has about 20 million tons of recoverable gold ores.

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COMPARISON OF CYANIDE AND THIOSULPHATE

2016-6-2  The conventional cyanidation process in gold leaching has been used since 1887. It is currently the main gold leaching process in the world. However, gold cyanidation process has serious environmental risks if an accident occurs in the process because of the toxicity of cyanide.

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Processing technologies for gold-telluride ores

2016-9-12  mineral present and the mineralogical association [3]. Gold, silver, and gold/silver-telluride minerals in ores dissolve more slowly than native gold in cyanide solutions, which results in less efficient gold extraction [4]. Similarly, cya-nide leaching tests on synthetic calaverite (AuTe2) and syl-vanite (AuAg)Te2 result in lower gold ...

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