thiosulfate leaching of gold from ores

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 Aug, Revised Novem The effect of additives on gold leaching was investigated using ammonium thiosulfate or calcium thiosulfate.

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Alternative lixiviants to cyanide for leaching gold ores ...

Alternative lixiviants to cyanide for leaching gold ores M.G. Aylmore Placer Dome Technical Services Ltd.,Alexander St., Vancouver, BC, Canada V6ACOveralternative lixiviant processes to cyanide have been tested in the laboratory, some of which have been successful for niche applications.

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Gold leaching by organic base polythionates: new non …

 &#; The proposed method of the gold recovery comprises leaching with a solution of a mixture of sodium and ammonium hydrosulfite and thiosulfate, by sorption of the thiosulfate-gold complex on a highly basic anion exchanger and by isolation of the highly basic anion exchanger, the sorption being carried outhours after the leaching. Then the ...

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thiosulfate leaching

 &#; out if Thiosulfate is a viable process for extracting gold. I would like to hear the facts,from someone that has used it in a real mining situation.Bits and pieces of information are what is dangerous with any process. I have edited this to include some information that may help the forum members in the future, and one in particular.

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The Role of Ligands and Oxidants in Thiosulfate Leaching of ...

 &#; The Role of Ligands and Oxidants in Thiosulfate Leaching of Gold,Senanayake_4__/__|2 The Role of Ligands ...

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USA

A process for recovering gold in which an ore slurry of refractory sulfidic and refractory carbonaceous ore having preg-robbing characteristics due to the presence of organic carbon is subjected to pressure oxidation in an autoclave. The oxidized ore slurry is mixed with a thiosulfate salt lixiviant, which mixture is maintained at a pH betweenand.while the slurry is agitated in a ...

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The deportment of mercury during thiosulfate …

Abstract. This paper reports on the behavior of mercury and its compounds during the thiosulfate leaching and recovery of gold. Thiosulfate solutions are shown to dissolve Hgand HgClto a similar extent as cyanide, but the leaching of HgS is significantly slower in thiosulfate solutions compared to cyanide. Hence, the use of thiosulfate may be an option for treating ores containing ...

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Thiosulphate Leaching | Mining | SGS Mexico

Thiosulfate leaching offers a number of benefits related to gold recovery yields and environmental concerns: 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.

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Associated Sulfide Minerals in Thiosulfate Leaching of ...

 &#; leaching rate but also increase the consumption of thiosulfate. Comparable gold extractions were observed in the leaching of the composite ores containing various sulfide minerals, such as pyrite, pyrrhotite, chalcocite, galena and chalcopyrite. The leaching of gold in the presence of iron sulfides was also improved by

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The treatment of copper-gold ores by ammonium …

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.

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The role of ligands and oxidants in thiosulfate leaching ...

 &#; % gold and silver extraction during thiosulfate leaching and conventional cyanidation of oxide ores (). In the case of gold ores of low silver grade (0.Ag g/t), thiosulfate leaching resulted low gold and silver extraction compared to cyanidation. However, in the case of gold ores with higher silver grades (2.Ag g/t), silver extraction with

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Kinetic Investigation and Dissolution Behavior of …

 &#; Thiosulfate is the most promising non-cyanide leaching reagent and the only reagent which found industrial application on gold recovery from a highly carbonaceous preg-robbing gold ore …

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Barrick Thiosulfate Leaching of Double Refractory Ore

 &#; The leaching of gold is then accomplished by maintaining a temperature of⁰C. Patentmentions that the thiosulfate concentration in the leaching container may have to be subsidized with more thiosulfate as the test goes along “to prevent the reprecipitation of gold as its sulfide.” The overall thiosulfate leaching ...

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The treatment of copper–gold ores by ammonium …

The application of ammonium thiosulfate for the treatment of copper–gold ores has been investigated. Copper minerals and copper–gold samples were leached in an ammonium thiosulfate solution under varying experimental conditions, i.e. aeration, temperature and reagent addition.

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Leaching of Gold from the Waste Mobile Phone Printed ...

 &#; gold and other precious metals from the complex ores.. But due to toxicity of the cyanide, its use in this process has been prohibited in many countries. Thiourea is a non-cyanide lixiviant for gold leaching which efficiently recovers gold.. but this is not an economical route for the gold leaching due to its high consumption and cost.

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Ammoniacal thiosulfate and sodium cyanide leaching of …

 &#; preg-robbing behavior of the parent ore. For carbonaceous matters from non-autoclaved ores, ammoniacal thiosulfate leaching only solubilized about% of the gold initially present in the carbonaceous matter, indicating that approximately% of the gold was encapsulated in sulfides. The percentage of gold leached by ammoniacal thiosulfate was ...

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A Review on Alternative Gold Recovery Reagents to Cyanide

 &#; Chlorination, Aqua Regia, Bromine, Thiocyanate, Thiosulfate and Thiourea leaching.For this propose, the gold leaching reagents are described and discussed in terms of their environmental and economical points of view. As result of this comparison, thiourea stands out as the most promising alternative gold leaching reagent to cya nide. Keywords

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Using Nickel as a Catalyst in Ammonium Thiosulfate ...

 &#; thiosulfate leaching process is also applicable for the heap leaching process.,) However, there are problems in commercializing the thiosulfate process in the gold milling industry, the problems are the most notably high reagent consumption and varying gold extraction results for the different ores under the same leaching conditions. Further-

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Copper-catalyzed thiosulfate leaching of low-grade …

 &#; Copper-catalyzed thiosulfate leaching is being investigated by the U.S. Bureau of Mines as a potentially economical and environmentally safe method for heap leaching or in situ leaching of low-grade oxidized gold ores. Six variables were investigated in fractional factorial screening tests ...

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Thiosulfate leaching of gold

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.

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Thiosulfate leaching of gold—A review, Minerals ...

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.

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THIOSULPHATE LEACHING thiosulfate leaching of gold from ores

 &#; 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 bearing ore bodies. Whether the leaching is performed in

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Treatment of a Polysulphide Ore by Ammoniacal …

 &#; That’s why cyanidation and ammoniacal thiosulfate leaching was performed at% of solids concentration in order to compare the efficiency of both t echniques. Cyanidation delivered a gold recovery of.6% athours of agitation, whereas ammoniacal thiosulfate leaching achieved an.9% of gold recovery in only one hour of agitation.

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Thiosulfate Leaching of Gold from Copper Bearing Ores

 &#; Thiosulfate leaching of gold and silver has been known since. In the Patera process, which was used for silver recovery for many years (Lidell), silver was extracted from silver chloride by sodium thiosulfate leaching of chloridizing-roasted ores and concentrates.

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USA

A process for recovering gold in which an ore slurry of refractory sulfidic and refractory carbonaceous ore having preg-robbing characteristics due to the presence of organic carbon is subjected to pressure oxidation in an autoclave. The oxidized ore slurry is mixed with a thiosulfate salt lixiviant, which mixture is maintained at a pH betweenand.while the slurry is agitated in a ...

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Thiosulfate leaching of gold—A review

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.

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Thiosulphate Leaching | Mining | SGS

Thiosulfate leaching offers a number of benefits related to gold recovery yields and environmental concerns: 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.

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ammonium thiosulfate mining gold leaching

Solution chemistry factors for gold thiosulfate heap leaching. Solution chemistry factors for gold thiosulfate heap leaching. Newmont Mining has successfully developed a heap leach process using ammonium thiosulfate for gold recovery from low grade carbonaceous sulfidic gold ores.

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Thiosulphate Leaching | Chemical | SGS Brazil

Thiosulfate leaching offers a number of benefits related to gold recovery yields and environmental concerns: 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.

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GOLD LECHING FROM A SAUDI ORE BY THE …

 &#; thiosulfate leaching of gold (Chen,). 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 aboutmillion tons of recoverable gold ores.

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thiosulfate leaching

 &#; out if Thiosulfate is a viable process for extracting gold. I would like to hear the facts,from someone that has used it in a real mining situation.Bits and pieces of information are what is dangerous with any process. I have edited this to include some information that may help the forum members in the future, and one in particular.

Read More

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