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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 …

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A Review of Thiosulfate Leaching of Gold: Focus on ...

Thiosulfate leaching is a promising alternative to cyanidation, and the main hindrances for its wide commercial application are the high thiosulfate consumption and the difficult recovery of dissolved gold. In this review, the four …

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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

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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.

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Cyanide alternative leaching reagents for gold recovery ...

an efficient gold recovery via thiosulfate leaching requires a strict process control, which is hardly manageable when a complex input material like crushed e-waste is used. In superficial leaching ex-periments of holistic RAM's a formation of a passive layer was observed, which hindered or slowed ...

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Leaching Gold and Silver with an Alternative System ...

The leaching tests were carried out with sodium thiosulfate, glycine and sodium thiosulfate-glycine to compare the efficiency and stability of extractants in the recovery of gold and silver. All tests were carried out under the following conditions: 1000 g of mineral with 1000, 2000 and 3000 ml of solution (liquid–solid ratio 1:1, 2:1 and 3:1).

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Method for thiosulfate leaching of precious metal ...

Where gold is the precious metal, thiosulfate leaching techniques have typically relied on the use of copper ions to catalyze and accelerate the oxidation of gold, ammonia to facilitate the formation and stabilization of cupric ammine ions and/or a pH at pH 9 or above to maintain a region of stability where both the cupric ammine and gold ...

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(PDF) Thiosulphate leaching for gold hydrometallurgy ...

Review Gold leaching by copper(II) in ammoniacal thiosulphate solutions in the presence of additives. Part I: A review of the effect of hard–soft and Lewis acid-base properties and interactions of ions. By sumartono tono. Ammoniacal thiosulfate leaching of gold from a refractory ore using a full factorial design.

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Gold Leaching i n Thiosulfate Solutions a nd Its ...

Gold leaching in thiosulfate solutions was evaluated environmentally and kinetically in different ways: (1) applying a closed system to leach gold (2) evaluating the environmental and metallurgical optimum thiosulfate leaching characteristics for pure gold and pure silver and gold silver alloys (4, 8, 20 and 50 wt

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A Review of Thiosulfate Leaching of Gold: Focus on ...

Thiosulfate leaching is a promising alternative to cyanidation, and the main hindrances for its wide commercial application are the high thiosulfate consumption and the difficult recovery of dissolved gold. In this review, the four solutions to …

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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.

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Gold Leaching from an Oxide Ore Using Thiocyanate as a ...

alternative gold leaching lixiviants such as thiosulfate, thiourea, and thiocyanate (SCN−) have been proposed.1,3−5 It should be mentioned that in the Goldstrike mine, Nevada, of Barrick Gold Corp., thiosulfate is currently used as an alternative lixiviant for gold extraction on a …

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Thiosulphate Leaching | SGS South Africa

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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Leaching Kinetics of Gold Involved in the System S2O32 ...

Abstract: Thiosulphate gold leaching is an alternative technology to the cyanidation of gold ores. Ethylenediaminetetraacetic acid is referred to as EDTA.A study on the leaching kinetics of gold involved in the system S 2 O 3 2--EDTA-Cu 2+ for the gold in this paper. The effect of temperature and of the addition of copper has been also analyzed, temperature has a …

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Gold recovery from thiosulfate leaching - The University ...

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 ...

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sodium thiosulphate And hypochloride leaching | Gold ...

Thiosulfate leaching is not a preferred method for several reasons. The leach solutions are generally in the range 5 to 30 grams per litre ammonium thiosulfate, around 7 grams per litre blue copper sulfate with ammonium hydroxide added to pH 9.5 to 10. This is a fairly narrow pH slot in which to operate.

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Gold leaching in thiosulfate solutions and its ...

Gold and silver leaching in thiosulfate solution is preferable kinetically and environmentally if conducted in a closed vessel system.The effect silver alloyed with gold was evaluated and the result showed that the dissolution rate of pure gold is higher than that form 4 and 8 wt% Ag alloys. And the dissolution rate of gold from 20 and 50% ...

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Liu X L, Xu B, Yang Y B, et al. Effect of galena on thiosulfate leaching of gold. Hydrometallurgy, 2017, 171: 157 doi: 10.1016/j.hydromet.2017.05.011 [14] Yang Y B, Gao W, Xu B, et al. Study on oxygen pressure thiosulfate leaching of gold without the catalysis

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GOLD LEACHING AND RECOVERY FROM THIOSULPHATE …

the copper minerals in the sulfide product, enables direct extraction of gold. The recovery of gold from solution can be obtained by many methods. In this study, the gold-containing thiosulfate solution was separated after leaching and treated with a portion of high-grade copper concentrate as a chemical precipitant for gold and copper.

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Gold recovery from thiosulfate leaching - The University ...

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 …

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A Review of Thiosulfate Leaching of Gold: Focus on ...

Thiosulfate leaching is a promising alternative to cyanidation, and the main hindrances for its wide commercial application are the high thiosulfate …

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Ammonium thiosulfate extraction of gold from printed ...

Leaching of the metals from PCBs was investigated with varying solid-to-liquid ratio in ammonium thiosulfate solution. As illustrated in Fig. 3, the increase in solid-to-liquid ratio from 0.1 g to 1 g/10 ml resulted in the decrease of metal extraction. At the maximum solid-to-liquid ratio in the present study (i.e., 1 g/10 ml), Au extraction was <5% due mainly to the lack of leaching …

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thiosulfate leaching | Gold Refining & Metal Extraction …

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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Thiosulphate leaching of gold in the presence of ...

Improvement of thiosulfate stability in gold leaching. Minerals & Metallurgical Processing 20 (2), 68–72. Xu, Y., Schoonen, M.A.A., 1995. The stability of thiosulfate in the presence of pyrite in low-temperature aqueous solutions. Geochimica et Cosmochimica 45 ...

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Ammoniacal thiosulphate leaching of gold ore

leaching of gold as its absence makes gold passive by the build up of sulphur coating on the surface as a result of decomposition of thiosulphate. It is known that thiosulphate is a meta-stable species that readily undergoes decomposition in aqueous solutions. Ammonia adsorbs onto the gold surface preferentially over

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Gold strike with thiosulphate - MINING.COM

The first gold bar produced with the thiosulphate process was poured in late 2014 at Barrick's Goldstrike plant in Nevada, USA and operations are …

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