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ammoniacal thiosulfate leaching of gold ore

Ammoniacal thiosulfate leaching of refractory oxide gold ore

Jul 10, 2017· The ammoniacal thiosulfate leaching of the ore was investigated as a function of time. The results are given in Fig. 7.As it is seen, the gold extraction increases with increase in time and attains 40% after 2 h leaching.

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(PDF) Ammoniacal thiosulphate leaching of gold ore

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.

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Ammoniacal thiosulfate leaching of refractory oxide gold ore

Ammoniacal thiosulfate leaching of refractory oxide gold ore was investigated. According to X-ray fluorescence and fire assay analyses, the ore contained about 33.01 wt% Si, 8.53 wt% Al, 7.26 wt% K, 3.00 wt% Fe, and 2.80 ppm Au.

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Gold recovery from ammonia-thiosulfate leaching solution

Nov 01, 2019· Gold leaching in the ammoniacal thiosulfate system shows a complex dependence on the variation of the thiosulfate, copper and ammonia concentration in the solution. The concentration ratio of thiosulfate to ammonia should be maintained in a range of 0.5–1.0 ( Xu et al., 2017 ) in order to keep Cu(II) as Cu(NH 3 ) 4 2+ in the appropriate

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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.

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AMMONIACAL THIOSULPHATE LEACHING OF A COPPER-RICH

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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The treatment of copper–gold ores by ammonium thiosulfate

Oct 01, 2002· The chemistry of the ammoniacal thiosulfate system for gold recovery involves many interrelated chemical equilibria which are not yet fully understood. This complexity can be attributed to the presence of three essential components, which define the ammoniacal thiosulfate leaching environment: ammonia, thiosulfate and copper.

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THIOSULPHATE LEACHING AN ALTERNATIVE TO

alternative to cyanidation for some gold bearing ore bodies. Whether the leaching is performed in stirred tank reactors or heaps, the size and type of equipment needed for a thiosulphate leaching flowsheet is very similar to a conventional cyanide leach. SGS is a global technical leader in the field of thiosulphate leaching, and our

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Gold dissolution in non-ammoniacal thiosulphate solutions

Ore leaching tests The leaching tests were carried out using a bottle roller and 1000 mL high-density polyethelene bottles containing 250 mL leach solution at 35% pulp density. In all the leach tests, 0.3 M calcium thiosulphate was used and the pH was maintained at 9–9.5 using hydrated lime.

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(PDF) Ammoniacal thiosulfate leaching of gold from a

Ammoniacal thiosulfate leaching of gold from a refractory ore using a full factorial design

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Ammoniacal thiosulfate leaching of refractory oxide gold

Request PDF Ammoniacal thiosulfate leaching of refractory oxide gold ore Ammoniacal thiosulfate leaching of refractory oxide gold ore was investigated. According to X

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A study of thiosulfate leaching of gold from carbonaceous

The objective of this study was to investigate leaching of gold from carbonaceous ore using ammoniacal thiosulfate solutions, and to determine the consumption of thiosulfate during leaching. The quantitative determination of thiosulfate in the leached solution in the presence of sulfite and sulfate ions was accomplished by means of flow

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Ammoniacal thiosulfate leaching of refractory oxide gold ore

Ammoniacal thiosulfate leaching of refractory oxide gold ore Ammoniacal thiosulfate leaching of refractory oxide gold ore was investigated. According to X-ray fluorescence and fire assay analyses, the ore contained about 33.01 wt% Si, 8.53 wt% Al, 7.26 wt% K, 3.00 wt% Fe, and 2.80 ppm Au.

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AMMONIUM THIOSULFATE LEACHING OF AN OXIDE GOLD

extending leaching times above 24 h did not increase gold extraction. ln the present work the use of ammoniacal thiosulfate leaching of a similar gold-copper ore was studied. The effect of the following variables on both gold extraction and thiosulfatc concentration in soiution were

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GOLD LECHING FROM A SAUDI ORE BY THE NONPOLLUTING

leaching in the ammoniacal thiosulfate solution. Gold leaching drastically decreased as the concentration of copper(II) increased 0.2 mM due to the degradation of S 2 O 3 2-. Keywords: gold, extraction, leaching, thiosulfate, Saudi ore Introduction Gold dissolution in an alkaline cyanide solution was first reported by Elsner in 1846.

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Ammoniacal thiosulfate and sodium cyanide leaching of preg

Gold leaching was primarily limited by the volume of lixiviant contacting the carbonaceous matter; however, a slight kinetic limitation was observed in ammoniacal thiosulfate leaching at higher flow rates. The percentage of gold leached by sodium cyanide from carbonaceous matter demineralized from autoclaved Goldstrike ore was

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Method for thiosulfate leaching of precious metal

Li, J. et al.; “Important Solution Chemistry Factors That Influence the Copper-Catalyzed Ammonium Thiosulfate Leaching of Gold,” Presented at the 125th SME Annual Meeting held in Phoenix, Arizona, Mar. 11-14, 1996, pp. 1-20. Li, J. et al.; “Copper Catalyzed Ammoniacal Thiosulfate Leaching of Gold and Silver—Solution Chemistry,” 34 pages.

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Gold recovery from refractory gold concentrates by

be exposed. Mohammadi et al. investigated ammoniacal thiosulfate leaching of refractory oxide gold ore, and they obtained maximum gold extraction of 55% (Mohammadi et al., 2017). Shen et al. had researched the direct thiosulfate leaching of gold from refractory ore, and they achieved gold recovery of only 70% (Shen et al., 2013).

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THIOSULPHATE LEACHING AN ALTERNATIVE TO

alternative to cyanidation for some gold bearing ore bodies. Whether the leaching is performed in stirred tank reactors or heaps, the size and type of equipment needed for a thiosulphate leaching flowsheet is very similar to a conventional cyanide leach. SGS is a global technical leader in the field of thiosulphate leaching, and our

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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

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ammonium thiosulfate leaching gold

>>Ammonium Thiosulfate Leaching Gold If you want to learn about our products,please call or write mail consultation. Base and precious metals group phoenix copper said processing on samples from its empire polymetallic open pit resource in idaho using a nontoxic ammonium thiosulfate ats reagent resulted in high gold recoveries of and,and

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AMMONIACAL THIOSULPHATE LEACHING OF A COPPER

In this study, copper-assisted ammoniacal thiosulphate leaching of a copper-rich gold ore was studied. A cyanide leaching test was also carried out for comparison. The experiments were designed using a Taguchi L9 (3 3) design for the evaluation of the effects of initial concentrations of thiosulphate, ammonia and copper on gold extraction.

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A Novel Thiosulfate System for Leaching Gold Without the

A Comparison of Cyanide and Thiosulfate Leaching for the Recovery of Gold from a Copper Containing Ore. Dai, X print version. 139 A Review of the Chemistry, Electrochemistry and Kinetics of the Gold Thiosulfate Leaching Process . Breuer, P. L. Alloy Formation During the Cementation of Gold on Copper from Ammoniacal Thiosulfate Solutions

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