An eco-friendly and efficient process of low potential …
The difference of gold recovery from pregnant solutions of thiosulfate leaching of gold under different potentials was also not investigated. This study aims to develop a clean and efficient process, consisting of low potential thiosulfate leaching and resin adsorption recovery to extract gold from a roasted gold concentrate.
An Experimental and DFT Study on Using the Thiosulfate
This study aims to comprehensively investigate the role of glycine (GL) in gold dissolution with thiosulfate (TS), utilizing both experimental and density functional theory (DFT) approaches. Three different leaching systems, namely AM–TS–Cu2+, GL–TS–Cu2+, and AM–GL–TS–Cu2+, were examined and compared using the …
Thiosulfate leaching of gold—A review
The ammoniacal thiosulfate leaching process for gold and silver extraction has been reviewed in terms of leaching mechanism, thermodynamics, thiosulfate …
Leaching of Gold with Copper–Tartrate–Thiosulfate Solutions
The process of gold dissolution in copper–tartrate–thiosulfate solutions can be divided into two stages under the experimental conditions. Both stages are controlled by chemical reactions. The reaction orders of gold dissolution with respect to copper, tartrate, and thiosulfate concentrations were 0.523, − 0.572, 0.659 and 0.218, − 0. ...
Review of gold leaching in thiosulfate-based solutions
The traditional copper−ammonia−thiosulfate system has been studied extensively. However, with many years of process development, there are still some …
Thiosulphate leaching for gold hydrometallurgy
Abstract. Thiosulphate leaching of precious metals has been developed as an alternative and non-toxic technique to the conventional cyanidation. This process has advantages over cyanide in a decreased interference from foreign cations and a lower environmental impact. Ammoniacal thiosulphate solution allows the solubilization of …
Recent advances in the development of an alternative to the …
A process based on thiosulfate leaching followed by resin-in-pulp gold extraction was developed to treat the carbonaceous, preg-robbing ores of Barrick's Goldstrike orebody in the Carlin Trend of Nevada. These ores have proven to be amenable to thiosulfate leaching under mild conditions. Gold leaches rapidly as the gold thiosulfate …
(PDF) Recent advances in the development of an alternative …
A process based on thiosulfate leaching followed by resin-in-pulp gold extraction was developed to treat the carbonaceous, preg-robbing ores of Barrick's Goldstrike orebody in the Carlin Trend of ...
THIOSULPHATE LEACHING – AN ALTERNATIVE TO …
The thiosulphate leaching process, followed by resin-in-pulp gold extraction, has been developed by SGS to the point where it is a technically and economically viable 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 Stability In Gold Leaching Process
Ammonium thiosulphate is an alternative gold leaching Laaviant used to replace cyanide. The current problem of thiosulphate gold leaching is the high reagent consumption, To understand the decomposition chemistry of thiosulphate, solution stability tests were conducted in open and sealed vessek mder ambient temperature
Effect of thiosulphate salts on ammoniacal thiosulphate leaching …
Semantic Scholar extracted view of "Effect of thiosulphate salts on ammoniacal thiosulphate leaching of gold" by D. Feng et al. ... Hong Yu Futing Zi Xianzhi Hu Jin-dong Zhong Yanhe Nie P. Xiang. Chemistry, Environmental Science ... Focus on Thiosulfate Consumption and Gold Recovery from Pregnant Solution. Bin Xu Wen-Yao …
Thiosulphate leaching of gold in the presence of …
Section snippets Materials. Gold foils (99.99% Au, thickness 0.2 mm) with a surface area of about 20 mm 2 were used in the leaching of pure gold. The gold foils were polished with 0.1 μm mono-crystalline diamond paste (Electron Microscopy Sciences), washed with acetone twice, rinsed with distilled water and swept with lint-free paper.A …
A Review of Thiosulfate Leaching of Gold: Focus …
Issue 6. 10.3390/met7060222. settings. Order Article Reprints. Open Access Review. A Review of Thiosulfate Leaching of …
Atmospheric leaching
Atmospheric leaching covers a range of apparatus set-ups and test conditions, and given the relative ease of this form of leaching, ALS can accommodate just about any scenario, as follows: Leaching using acid and alkaline lixiviants. Cyanidation and complexing agents including halides and thiosulphate. Range of agitated leach vessels.
Biooxidation-thiosulfate leaching of refractory gold …
He-fei Zhao, Hong-ying Yang, Lin-lin Tong, Qin Zhang & Ye Kong. 182 Accesses. 16 Citations. Explore all metrics. Abstract. A process of biooxidation followed …
The effect of iron contaminants on thiosulphate leaching of …
3.1. Effect of iron species on gold leaching. The ore samples, along with metallic iron or ferric ions, were wet ground in the ceramic ball mill for 1 h at a solid concentration of 60%. The resultant pulps were diluted to 28.6% with the addition of the leaching reagents for subsequent leaching tests. Leaching in the absence of the iron …
An electrochemical study of the dissolution of gold in …
Thiosulfate has been considered as one of the most promising of the non-toxic alternatives to cyanide for the leaching of gold and much work has been carried out with the aim of understanding and improving the ammoniacal thiosulfate leaching process. In particular the behaviour of gold in thiosulfate solutions containing copper in the absence …
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 …
process for thiourea and thiosulphate leaching
Nov 13, 2011. #6. Wyndham. If you roast the sand,then grind the sand in a ball mill, or rod mill with citric acid,it gets rid of iron and sulfides. Rinse the sand well with water and you are good to go. It is always a good idea to eliminate all the junk you can, before leaching. Q.
The copper–ethanediamine–thiosulphate leaching of
The gold dissolution rate of the gold ore could reach 94.3% and the thiosulphate consumption could be reduced to 1.12 kg/t ore in the thiosulphate gold leaching system containing 0.1 mol/L of sodium thiosulphate, 0.06 M ethanediamine, 0.005 M copper ion and 1.5 kg/t of CTAB and operated at a rate of agitation of 150 rpm.
Thiosulphate leaching of gold in the Cu–NH3–S2O32
Thiosulphate leaching of gold is often conducted in the conventional Cu–NH 3 –S 2 O 3 2 ... Therefore, the roasting-assisted leaching process eliminated the adverse effects of these impurity metals and further improved Au leaching efficiency to 97.8% while also decreased thiosulfate consumption. The recovery of Au from the pregnant leach ...
An Experimental and DFT Study on Using the Thiosulfate
An Experimental and DFT Study on Using the Thiosulfate–Glycine Complex as an Alternative Agent of Cyanide in the Gold Leaching Process. Research Article. …
Thiosulphate leaching of silver from an arsenical refractory ore
In this study, thiosulphate leaching combined with ultra-fine grinding (UFG) was studied for silver extraction from an arsenical refractory ore. Direct cyanidation of the ore (d 80: 50 µm) led to a low silver extraction of ≤ 70% over 24 h. leaching period. Extraction of silver in cyanide leaching was improved to 85% after ultra-fine grinding.
Bin Xu, Wenhao Kong, Qian Li *, Yongbin Yang, Tao …
Abstract: Thiosulfate leaching is a promising alternative to cyanidation, and the main hindrances for its wide commercial application are the high thiosulfate consumption and …
Thiosulfate leaching of gold—A review
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. ... 1995. Li Y. and Zhang W., Process development for ammoniacal thiosulphate leaching of gold and silver from complex sulphides …
A Review of Ammoniacal Thiosulfate Leaching of Gold: An …
ABSTRACT This literature review provides an update of ammoniacal thiosulfate as a potential lixiviant of gold, the history of thiosulfate leaching and recent progress on thiosulfate leaching of gold, as well as the production, oxidation, and stabilization of thiosulfate. The leaching results of different types of gold ores including …
Research on Gold Leaching from a Refractory Gold …
Abstract. Thiosulfate is a green gold leaching agent that shows great potential to replace the highly toxic cyanide. Ammonia is traditionally used as the copper ligand in …
Ammoniacal thiosulphate leaching of gold in the presence …
Semantic Scholar extracted view of "Ammoniacal thiosulphate leaching of gold in the presence of pyrite" by D. Feng et al. ... A process of biooxidation followed by thiosulfate leaching of gold from refractory gold concentrate was investigated. ... Bin Xu, Wen-Yao Kong, Qian Li, Yong-bin Yang, T. Jiang, Xiaolian Liu. Chemistry.
Thiosulphate leaching of gold in the presence of
Thiosulphate leaching of gold in the presence of ethylenediaminetetraacetic acid (EDTA) ... Bin Xu Wen-Yao Kong Qian Li Yong-bin Yang T. Jiang Xiaolian Liu. Chemistry. 2017; ... Hong Yu Futing Zi Xianzhi Hu Jin-dong Zhong Yanhe Nie P. Xiang. Materials Science, Chemistry. 2014; 48.
Minerals | Free Full-Text | Study on Synergistic Strengthening …
Gold leaching using the copper–ethylenediamine–thiosulfate (Cu2+-en-S2O32−) system, which contains copper–ethylenediamine complexes, instead of the use of copper–ammonia catalysis, is environmentally friendly and cost-effective. In this study, pyrite and Ni2+ were added to the Cu2+-en-S2O32− system to clarify their individual and …