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ALTERNATIVE REAGENTS TO CYANIDE IN GOLD LEACHING – …

Alternative reagents to cyanide in gold leaching – a case study: application of the ammoniacal-thiosulphate system on Castromil ores ABSTRACT Environmental awareness has made a name for itself in the past few decades. Due the negative impact of the mining industry, a growing need for cleaner and "greener" processing technologies has risen.

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Effect of thiosulphate salts on ammoniacal thiosulphate ...

Dec 01, 2010· Gold leaching with calcium, sodium and ammonium thiosulphate salts was investigated in both pure gold and ore leaching systems. The type of thiosulphate salts was found to influence significantly the solution and surface chemistry, and hence the leaching of pure gold and the pyrite concentrate in the ammoniacal thiosulphate solutions.

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‪Oktay CELEP‬ - ‪Google Scholar‬

Ammoniacal thiosulphate leaching of a copper-rich gold ore AD Bas, E Ozdemir, EY Yazici, O Celep, H Deveci Proceedings of the 15th Conference on Environment and Mineral Processing …, 2011

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Gold dissolution in non-ammoniacal thiosulphate solutions ...

ammoniacal copper(II)/thiosulphate system offers fast leaching kinetics, but there are difficulties in controlling the complex solution chemistry and there are concerns over the use of ammonia. Recently, thiosulphate leaching of gold in the absence of ammonia has shown to be one of the most promising alternatives to cyanide, as evident from the

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thiosulfate leaching of gold from ore

Ammoniacal thiosulphate leaching of gold ore …344 The European Journal of Mineral Processing and Environmental Protection Vol.3, No.3, 1303-0868, 2003, pp. 344-352 Ammoniacal thiosulphate lea&thiosulfate leaching of gold from ore

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US6632264B2 - Gold recovery from thiosulfate leaching ...

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 thiosulfate solution prior to contacting with an ion ...

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ammoniacal thiosulfate leaching of gold ore

Ammoniacal thiosulfate leaching of refractory oxide gold ore. Jul 10, 2017 · Ammoniacal thiosulfate leaching of refractory oxide gold ore was investigated. According to Xray fluorescence and fire assay analyses, the ore contained about 33.01 wt% Si, 8.53 wt% get price

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ammoniacal thiosulfate leaching of gold ore

Nov 14, 2020· Ammoniacal thiosulphate leaching of gold ore. studied. The ammoniacal thiosulphate leaching of gold is dependant on both ammonia and thiosulphate concentration. The leaching is improved significantly at a particular ratio of ammonia to thiosulphate concentration and that ratio varies from ore to ore.

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Oxidative pre-treatment in thiosulphate leaching of ...

Feb 19, 2010· The acid wash did not dissolve any gold showing that no adsorbed gold complexes were present on the mineral surfaces in the sulphide ore. A gold recovery of 91% was achieved in the direct ammoniacal thiosulphate leaching with 0.25 M thiosulphate, 1 M ammonia and 12 mM cupric ions after 24 h, and gold extraction was obtained at doubled ammonia and thiosulphate concentrations ().

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leaching of gold in ammoniacal thiosulfate

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. In the present study, an attempt is made to assess the feasibility of ammoniacal thiosulphate leaching of gold . get price

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(PDF) Thiosulphate leaching for gold hydrometallurgy ...

The gold solution utilized for electrolysis tests came from the thiosulphate leaching. The chemical composition was the following: Au = 15.8 mg/1 Cu = 0.8 g/1 Na2S203 = 1.5 M Traces of silver ( < 1 mg/1) and iron have been also detected. 3.2.

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Ammoniacal thiosulfate leaching of refractory oxide gold ore

Abstract 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. Moreover, X-ray diffraction analysis and mineralogical studies using polished thin sections showed that the ore was composed of quartz, epidote, muscovite ...

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Thiosulphate leaching of gold in the presence of ...

Jan 01, 2011· A diagnostic leaching test using thiosulphate was conducted previously on a similar sulphide ore (Feng and Van Deventer, 2010c) where it was shown that the gold is mainly "free" and complete recovery can be achieved with thiosulphate at severe reagent conditions.In the current study lower reagent concentrations will be used.

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ammoniacal thiosulphate leaching of gold ore

Ammoniacal thiosulphate leaching of gold ore344 The European Journal of Mineral Processing and Environmental Protection Vol.3, No.3, 1303-0868, 2003, pp. 344-352 Ammoniacal thiosulphate leachin&ammoniacal thiosulphate leaching of gold ore

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Gold dissolution in non-ammoniacal thiosulphate solutions ...

Abstract. Thiosulphate has received much attention as an alternative non-cyanide lixiviant for gold recovery over the last three decades. In particular, a number of studies have shown that an ammoniacal copper(II)/thiosulphate system offers fast leaching kinetics, but there are difficulties in controlling the complex solution chemistry and there are concerns over the use of ammonia.

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Sodium Thiosulphate Gold Leaching

Jun 02, 2016· Thiosulphate as an Alternative to Cyanide for Gold Processing HYPOCHLORITE LEACHING OF GOLD ORE TREATMENT OF A COPPER - RICH GOLD ORE BY AMMONIA ASSISTED CYANIDE LEACHING Electrochemistry and Mechanism of Leaching Gold with Ammoniacal Thiosulphate Recovery Of Gold And Silver From Oxidation Leach Residues By Ammoniacal Thiosulphate Leaching

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Gold Recovery From Printed Circuit Boards of Mobile Phones ...

3bb2c3cdd2588cdbd4b46cc7774fd6ef8583 (1) - Free download as PDF File (.pdf), Text File (.txt) or read online for free.

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ammoniacal thiosulfate leaching of gold ore

May 31, 2020· 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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EXTRACTION OF GOLD AND SILVER FROM TURKISH GOLD ORE …

(2007). EXTRACTION OF GOLD AND SILVER FROM TURKISH GOLD ORE BY AMMONIACAL THIOSULPHATE LEACHING. Mineral Processing and Extractive Metallurgy Review: Vol. 29, No. 1, pp. 68-82.

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gold leaching adsorption technology

The leaching and adsorption behaviour of gold ores. factor in the enhanced gold extraction in the presence of activated carbon for the ores. Kinetic models were developed for the leaching of gold from the ore, adsorption onto activated carbon and preg-robbing at the ore surface.

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EXTRACTION OF GOLD AND SILVER FROM TURKISH GOLD ORE …

Nov 14, 2007· Thiosulphate leaching of precious metals is one of the processes that were developed as an alternative and nontoxic technique to conventional cyanidation. The aim of this experimental study was to investigate the possibilities of leaching gold and silver in ammoniacal thiosulphate solutions …

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electrowinning process for extraction of gold from e scrap

REVIEWING THE OPERATION OF GOLD . All of the hydrometallurgical gold extraction routes utilize a leaching step to produce a gold-bearing solution as an intermediate product while the recycling of secondary gold from the recycling of secondary gold from electronic and precious metal scrap using selective and fast dissolution of the precious metal constituents.

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Thiosulphate leaching of gold in the presence of ...

Abstract Carboxymethyl cellulose (CMC) was introduced as a surfactant in the leaching of pure gold as well as a sulphide ore using ammoniacal thiosulphate medium. Competing with thiosulphate anions to complex with the cupric ion at the axial coordinate sites, CMC in small quantities reduced the consumption of thiosulphate in the ammoniacal thiosulphate leaching system.

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Experimental and Numerical Study of Multiphase Mixing ...

thiosulphate when it reacts with ore [1]. It is suggested that ammonia transports gold ions to bulk solution by being more strongly adsorbed on gold surface [2]. Oxygen is needed to recover copper (II) from copper (I) at a little expense of slow thiosulphate oxidation by molecular …

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US20070266827A1 - Thiosulphate Leach Process - Google Patents

An improved thiosulphate leach process for the recovery of gold from ores and other gold-bearing 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.

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

In this current study, the extraction of gold from a high grade copper-rich gold ore by copper-assisted ammoniacal thiosulphate leaching was studied by adopting Taguchi L 9, (3 3) experimental ...

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Thiosulphate Stability In Gold Leaching Process

gold ore to 62% with a thiosulphate consumption of 19kg/t.Sulphate addition could not ùnprove the thiosulphate stability significantiy, Gold Ieachmg at high pulp density (62%) produced the same gold extraction and greatiy reduced the thiosulphate consumption to 13kg/t. The mnieral content of …

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ammoniacal thiosulfate leaching of gold ore

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 (33) design for the evaluation of the effects of initial concentrations …

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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 …

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