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A COMBINED CHEMICAL AND BIOLOGICAL HEAP LEACHING OF .

A COMBINED CHEMICAL AND BIOLOGICAL HEAP LEACHING OF .

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It has been shown that a very efficient leaching of gold from ores is achieved by means of alkaline solutions containing both amino acids and thiosulphate as complexing agents as well as some ions acting as catalysts in the oxidation of the native gold to an ionic state and/or in the complexation of the gold ions (Groudev and Groudeva, 1993; Groudev et al., 1993; Groudev et al., 1994). In the ...

Biooxidation‒thiosulfate leaching of refractory gold ...

Biooxidation‒thiosulfate leaching of refractory gold ...

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Thiosulfate is not only cheap and nontoxic but can also form stable gold complexes. It is also suitable for leaching typical oxidized gold ores . With the leaching of certain sulfide minerals with thiosulfate, however, previous studies have shown that while a large amount of thiosulfate is consumed, a poor leaching rate is obtained.

Importance of Solution Chemistry for Thiosulphate .

Importance of Solution Chemistry for Thiosulphate .

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Gold recovery by catalytic copper ammonium thiosulphate solution has been studied. Such a process strategy is very attractive for leaching certain difficulttotreat ores and presents lessened lixiviant toxicity compared to cyanide. Newmont Gold Company has evaluated the ammonium thiosulphate heap leach process for gold recovery from low grade carbonaceous sulphidic refractory ores following ...

Gold Recovery from Kaletaș (Turkey) Ore by Thiosulphate ...

Gold Recovery from Kaletaș (Turkey) Ore by Thiosulphate ...

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Thiosulfate leaching of roasted concentrate resulted in 98% gold and 93% silver recovery after 48 the conditions used in this study, reagent consumption was high ranging from 36 to 70 ...

Thiosulphate as an alternative to cyanide for gold ...

Thiosulphate as an alternative to cyanide for gold ...

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18/07/2013· Thiosulphate is an attractive alternative reagent to cyanide for processing gold ores. It is relatively cheap and nontoxic, 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. However, research over the past 20 years has ...

thiosulfate leaching of gold from ores

thiosulfate leaching of gold from ores

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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.

Exploring the influence of DMSA on thiosulphate leaching ...

Exploring the influence of DMSA on thiosulphate leaching ...

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Because of these drawbacks, there is a need to identify lesstoxic alternatives to cyanide that are appropriate for leaching gold from a wide variety of ores. In the search for an alternative to cyanide, thiosulphate has been identified as suitable candidate and shows good initial leaching kinetics for gold provided that ammonium hydroxide and copper sulphate are used as catalysts. However ...

THE INCREASED ACTIVITY IN THE DEVELOPMENT OF THIOSULFATE .

THE INCREASED ACTIVITY IN THE DEVELOPMENT OF THIOSULFATE .

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situ leaching of oxidised gold ores. 155 INTRODUCTION Thiosulfate has received much attention in the last couple of decades as a potential alternative lixiviant to cyanide for gold recovery. This is highlighted by the large number of references in the review by Muir and Aylmore (1) in 2001 and the more recent overview by Aylmore (2). The majority of this past research has focused on the ...

GOLD LECHING FROM A SAUDI ORE BY THE NONPOLLUTING ...

GOLD LECHING FROM A SAUDI ORE BY THE NONPOLLUTING ...

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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. In ...

Barrick Thiosulfate Leaching of Double Refractory Ore

Barrick Thiosulfate Leaching of Double Refractory Ore

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The leaching of gold is then accomplished by maintaining a temperature of 5070⁰ The 2009 Patent15 mentions that the thiosulfate concentration in the leaching container may have to be subsidized with more thiosulfate as the test goes along "to prevent the re precipitation of gold as its sulfide." The overall thiosulfate leaching ...

ThiosulphateasanAlternativetoCyanideforGoldProcessing ...

ThiosulphateasanAlternativetoCyanideforGoldProcessing ...

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It then reviews the results of leaching various gold ores that have been reported in the literature, discusses gold recovery options, and considers environmental and toxicity issues. Some of the issues that require further research include decreasing the oxidation of thiosulphate by Cu(II) or other oxidants, increasing the extraction of gold compared to cyanide, and understanding the variation ...

WOA1 Improved thiosulphate leach process ...

WOA1 Improved thiosulphate leach process ...

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An improved thiosulphate leach process for the recovery of gold from ores and other goldbearing materials, characterised in that the leach solution comprises thiosulphate, thiourea or a reagent chemically related thereto, and an oxidant that does not oxidise thiosulphate, the process producing a pregnant leach solution from which gold may be recovered.

Gold recovery from refractory gold concentrates by ...

Gold recovery from refractory gold concentrates by ...

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with leaching directly. Keywords: gold, pressure oxidation, thiosulfate, leaching, RSM 1. Introduction Gold was an important rare and precious metal, always coexists with sulphide minerals such as pyrite and arsenopyrite (Azizi et al., 2010; Nunan et al., 2017). Due to the depletion of highgrade gold ores

Biooxidation‒thiosulfate leaching of refractory gold ...

Biooxidation‒thiosulfate leaching of refractory gold ...

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Thiosulfate is not only cheap and nontoxic but can also form stable gold complexes. It is also suitable for leaching typical oxidized gold ores . With the leaching of certain sulfide minerals with thiosulfate, however, previous studies have shown that while a large amount of thiosulfate is consumed, a poor leaching rate is obtained.

Leaching Gold Ore Thiosulphate

Leaching Gold Ore Thiosulphate

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Leaching Gold Ore Thiosulphate. The gold industry has been seeking alternative reagents for leaching gold from lowgrade 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 ...

WOA1 Improved thiosulphate leach process ...

WOA1 Improved thiosulphate leach process ...

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An improved thiosulphate leach process for the recovery of gold from ores and other goldbearing materials, characterised in that the leach solution comprises thiosulphate, thiourea or a reagent chemically related thereto, and an oxidant that does not oxidise thiosulphate, the process producing a pregnant leach solution from which gold may be recovered.