thiosulfate leaching of gold

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 The reduction of copper (II) and the oxidation of thiosulfate and oxysulfur anions in gold leaching solutions Hydrometallurgy v 70 p 163-173 2003 [ Links ] CHANDRA I JEFFREY M I An electrochemical study of the effect of additives and electrolyte on the dissolution of gold in thiosulfate solutions Hydrometallurgy v

COMPARISON OF CYANIDE AND THIOSULPHATE LEACHING FOR GOLD

cons which have been discussed in this work The topics of this work are gold ores and their suitability for leaching processes pretreatment of concentrate leaching chemistry and reagent consumption leaching kinetics gold recovery from leaching liquors

mechanisms for anodic or chemical oxidation of gold in thiosulfate solutions The role of ligands and oxidants in thiosulfate leaching of gold Gamini Senanayake A J Parker Cooperative Research Centre for Hydrometallurgy Department of Mineral Science and Extractive Metallurgy Murdoch University Perth WA 6150 Australia Abstract

Thiosulfate leaching has been proven to be effective on ores with high soluble copper values or ores which experience preg-robbing: the absorption by carbonaceous components which preferentially absorbs gold and gold-cyanide complexes Leaching through Bulk Leach Extractable Gold or BLEG is also a process that is used to test an area for gold

THIOSULPHATE LEACHING – AN ALTERNATIVE TO CYANIDATION IN GOLD PROCESSING ALTERNATIVES TO CYANIDE IN GOLD PROCESSING THIOSULPHATE LEACHING 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

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 amount of monomer gold was only 21% The gold-bearing sample was identified as a high-sulfur fine-sized wrapped-type refractory gold


Thiosulfate Leaching of Gold a Review

Leaching by thiosulfate decreases interference from these foreign cations In fact the presence of copper in the ore can be utilised directly in the leaching process High consumption of reagents and the lack of a cheap process for recovering gold have made thiosulfate leaching uneconomical to date in comparison with cyanide leaching

Despite the fact that the gold mining industry accounts for only 13% of total cyanide consumption there is growing public concern over the use of toxic cyanide for gold extraction Many researchers have identified that thiosulfate leaching is the most likely alternative to cyanidation due to nontoxicity low cost and other benefits This

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 This technology offers great

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 August 15 2017 Revised November 15 2017 The effect of additives on gold leaching was investigated using ammonium thiosulfate or calcium thiosulfate

Thiosulfate leaching of gold—A review Thiosulfate leaching of gold—A review Aylmore M G Muir D M 2001-02-01 00:00:00 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 The application to different ore types and

27 06 2006Processes are provided for recovering precious metals from refractory materials using thiosulfate lixiviants The processes can employ lixiviants that include at most only small amounts of copper and/or ammonia and operate at a relatively low pH reduction of polythionates inert atmospheres to control polythionate production and electrolytic solutions which provide

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

The role of ligands and oxidants in thiosulfate leaching of gold 0 Gamini Senanayake A J Parker Cooperative Research Centre for Hydrometallurgy Department of Mineral Science and Extractive Metallurgy Murdoch University Perth WA 6150 Australia The widely used cyanidation technology is not applicable to some gold ores due to economic or technical

THIOSULFATE LEACHING OF GOLD

Thiosulfate leaching of gold--a review 5 00E-04 151 4 00E-04 Ag(S2Os)3 s c O C O 3 00E-04 2 00E-04 O o Ag(S~Os)~ ~ 1 00E-04 Ag(NHs)~ 0 00E+00 -6 -5 -4 -3 -2 -1 0 Log [NHs] (M) (a) 5 00E-04 Ag(NHs)2* 4 00E-04 Ag(S2Os)~ J c 3 00E-04 o ~ 2 00E-04 o 1 00E-04 4 i ~S 0 00E+00 -6 -5 -4 -3 -2 -1 0 1 log [S2Os2] (M) (b) Fig ll Distribution of

inproceedings{Tripathi2012LeachingOG title={Leaching of Gold from the Waste Mobile Phone Printed Circuit Boards (PCBS) with Ammonium Thiosulphate} author={Abhishek N Tripathi and Manoj Kumar and Daniela Sau and Archana Agrawal and Somik Chakravarty and Tilak Raj Mankhand} year={2012

lurgical gold extraction routes utilize a leaching step to produce a gold-bearing solution as an intermediate product while the recycling of secondary gold from electronic and precious metal scrap is based on the selective and fast dissolu-tion of the precious metal Therefore A Method for Leaching or Dissolving Gold from Ores or Precious

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% silver alloys is more than that obtained for pure gold

Sweep voltammetry chronocoulometry and Surface Enhanced Raman Spectroscopy (SERS) were employed in this research program to characterize the gold-electrolyte interface under leaching conditions in alkaline thiosulfate solution A new methodology was established that allowed for the measurement of the leaching currents from current-potential curves with

• The thiosulfate leaching of gold from waste PCBs exhibits that gold could be leached with good recovery under specific conditions Recovery of gold was found to be highly dependent on the concentration of copper sulfate ammonium thiosulfate pH and pulp density

In the case of the gold leaching process using thiosulfate copper oxidation by thiosulfate deserves special attention because it is a thermodynamically favored reaction However in alkaline solutions oxidization of copper by thiosulfate is much slower (Zhang 2004) Most published studies on gold leaching with thiosulfate focus on gold ores

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