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...

Sodium Thiosulphate Gold Leaching - 911 Metallurgist

Mar 17, 2017 ... 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...

Leach Gold using Hyposulphite Of Sodium AKA Thiosulfate Gold ...

Mar 19, 2017 ... Thiosulfate Gold Extraction. The fact that gold will dissolve in sodium hyposulphite solutions is known from the lixiviation of silver and gold ores. The gold will dissolve only in small quantities. According to researchers, if gold leaf is treated for a time with sodium hyposulphite solutions of varying strengths,'...

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

Jun 15, 2017 ... Abstract: 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 reduce the consumption of thiosulfate, including the control...

Thiosulfate leaching of gold - A review | Request PDF - ResearchGate

Request (PDF) | Thiosulfate leaching... | 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 process options have also been discussed.

thiosulphate leaching – an alternative to cyanidation in gold ... - SGS

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 associated with preg-robbing ores. The.

thiosulfate leach of gold plate - YouTube

Feb 24, 2014 ... recovered powders from a sodium thiosulfate leach of gold plated pins. if all my experiments can be perfected, i will have a safe, non-toxic process to remov...

COMPARISON OF CYANIDE AND THIOSULPHATE LEACHING ...

The conventional cyanidation process in gold leaching has been used since 1887. It is currently the main gold leaching process in the world. However, gold cyanidation process has serious environmental risks if an accident occurs in the process because of the toxicity of cyanide. After some serious cyanide accidents some...

Thiosulphate Stability In Gold Leaching Process - Bibliothèque et ...

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 and normal pressure conditions. A low-grade mild refiacto ry copper-bearing gold ore.

A Review of Ammoniacal Thiosulfate Leaching of Gold: An Update ...

Aug 2, 2016 ... 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...

US8821613B2 - 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...

Associated Sulfide Minerals in Thiosulfate Leaching of Gold - QSpace

Abstract. The effects of some associated minerals on thiosulfate gold leaching were studied through thermodynamic analysis and leaching experiments on composite ore samples containing various minerals and a reference silicate gold ore. In the leaching test on the reference gold ore, about 93% of gold was extracted.

Gold strike with thiosulphate | MINING.com

Jun 19, 2015 ... Within the tanks, the slurry interacts with thiosulfate and a fine, bead-like material called resin that collects the gold. At full capacity, 13,400 tons of ore can be processed daily, with leaching taking place simultaneously in two sets of seven tanks. The thiosulphate process will enable Barrick to contribute an...

Leaching of Gold - DocCopper

It is this second sulfur atom that dominates the complexing tendencies and reducing properties of the thiosulfate ion. Thiosulfate form complexes with a variety of metals including gold. The chemistry associated with the leaching of gold with thiosulfate can be rather involved. Gold will dissolve in the presence of ammonium...

Leaching of Gold from the Waste Mobile Phone ... - Semantic Scholar

enormously to the generation of large quantity of electronic (e) waste. One such e-waste, the mobile phone printed circuit boards (PCBs) contain various precious metals which can be extracted by different hydrometallurgical routes. The present work deals with the recovery of gold using ammonium thiosulfate as a leaching...

US8097227B2 - 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 amine ions and/or a pH at pH 9 or above to maintain a region of stability where both the cupric amine...

Initial leach test results on gravity tails - The AusIMM

Gold recovery risk lower – robust leach process captures gold not recovered by gravity. • Gravity recovery doesn't have to chase the fine gold – optimise for recovery of the coarse gold. Additional gold recovery (small gold miners). Thiosulfate Leach. (CSIRO system). Gravity recovery. Ore. Gravity tail. Leach tail. 30-60% Au...

Treatment of a Polysulphide Ore by Ammoniacal Thiosulfate ...

of agitation, whereas ammoniacal thiosulfate leaching achieved an 80.9% of gold recovery in only one hour of agitation. Then, the ammoniacal thiosulfate solutions obtained were submitted to five gold recovery techniques (carbon adsorption, cementation, adsorption on carbon impregnated with metallic copper, ion flotation...

Determination of the potential gold electrowinning from an ...

Oct 5, 2015 ... The thiosulphate was also tested with success as a leaching agent for gold in the scrap of printed circuit boards of mobile phones (Ha et al., 2010; Tripathi et al., 2012). The gold leaching ..... Breuer, PL, Jeffrey, MI (2000) Thiosulfate leaching kinetics of gold in the presence of copper and ammonia. Minerals...

Spectroelectrochemical studies of the gold-electrolyte ... - Chemistry

Decrease in the rate of gold dissolution. ✓ Thiosulfate-ammonia-copper4. Experimental Results. Introduction. ✓ Low cost. ✓ Reasonably simple chemistry. ✓ Environmentally friendly. ✓ Small consumption. Leaching of gold. Ideal leaching reagent. Cyanide1. Electrochemical study of leaching of gold in thiosulfate solution.

Possibility to replace toxic cyanide with more environmentally ... - LUT

Dec 16, 2016 ... Significant problems have included the high consumption of chemicals, the difficulty of controlling the process chemistry and the challenges related to the recovery of gold. The efficiency of thiosulfate leaching is especially highlighted in situations where the composition of the raw material makes it...

Goldstrike TCM Leach Project Successful gold production ... - Ausenco

Ausenco provided EPC services and studies for Barrick's Goldstrike Mine (Nevada, USA) which uses a patented thiosulfate processing method and has the world's first use of resin in leach technology. As.

Ammoniacal thiosulfate and sodium cyanide leaching of preg ...

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 inversely related to the preg-robbing behavior of the parent ore, suggesting that...

THIOSULFATE DE SODIUM | CB1971 - Boursorama

The leaching of gold with thiosulfate solutions in the absence of ammonia and copper ions was investigated using electrochemical and kinetic methods. In sodium thiosulfate solutions, the electrochemical oxidation of gold was hindered and the leaching rate using pure oxygen as the oxidant was very slow.

Adsorption of Copper from an Ammonia-Thiosulfate Media Using ...

Oct 11, 2016 ... Adsorption, Desorption, Copper, Ion Exchange Resin, Ammonia-Thiosulfate. 1. Introduction. The study of copper adsorption on anion exchange resins has to do with the recovery of gold as. (. ) −. 3. 2. 3 2. Au S O present in the solutions produced by leaching gold ores in an ammonia-thiosulfate media...

Recovery of gold from electronic waste by iodine-iodide leaching

Dec 16, 2016 ... Gold recovery by iodine-iodide solution is an effective and environment-friendly method. The aim of this research is to investigate the possibility of iodine-iodide gold recovery from gold-plated metal, which is a waste product of the electronic industry. Leaching experiments were carried out in solutions,...

University of Nevada, Reno Barrick Thiosulfate Leaching of Double ...

addition, the Leaching Team analyzed the thiosulfate leaching process compared to the traditional cyanide process. They found that the profit of the thiosulfate leaching process was similar to that of the traditional cyanide method. Furthermore, it was found that after three hours of thiosulfate leaching, 63 weight% of gold was...

Going for gold: Alternative processing methods - Australian Mining

Jan 17, 2014 ... Scientists at the CSIRO and the North Western University in Illinois are researching two different methods, thiosulfate and alpha-cyclodextrin (a substance commonly extracted from corn starch) respectively, to process and recover gold. Thiosulfate and bromide are used to leach the gold, in a similar way to...

Sodium thiosulfate - Wikipedia

Sodium thiosulfate (sodium thiosulphate) is a chemical and medication. As a medication it is used to treat cyanide poisoning and pityriasis versicolor. It is an inorganic compound with the formula Na2S2O3.xH2O. Typically it is available as the white or colorless pentahydrate, Na2S2O3·5H2O. The solid is an efflorescent...

The Extraction of Gold from E-waste by Hydrometallurgy : Oriental ...

In other words, less than 2 % of the gold remained in the gold leach solution. Then, the organic phase, which is charged with 2 M ammonium hydroxide solution and 0.5 M sodium thiosulfate, was transferred. The results were not positive, and 3.13 and 15.26 % of gold was transferred from organic to aqueous phase.

Palladium Leaching - CARENA

2) Recovery of silver from lead/zinc flotation tailings by thiosulfate leaching. Chieng, Pau, 2006. 3) Ag recovery from copper anode slime by acid leaching at atmospheric pressure to synthesize silver nanoparticles. Atefeh Khaleghi, 2013. 4) Thiourea leaching gold and silver from the printed circuit boards of waste mobile...

Shell-isolated nanoparticle-enhanced Raman spectroscopy ...

Aug 11, 2016 ... during thiosulfate-mediated gold leaching. Scott R. Smith, a. Janet Y. BXinhai, b. Yeonuk Choi c and Jacek Lipkowski a. *. An applied approach for in situ characterization of oxide ore samples exposed to a thiosulfate-based leaching solution with shell-isolated nanoparticle-enhanced Raman spectroscopy...

Thiosulfate Leaching as an Alternative to Cyanidation: | Copper | Zinc

33rd Annual Operator's Conference of the Canadian Mineral Processors 23-25, January 2001 Ottawa, Ontario. Keywords: Thiosulfate, gold, extraction, reagent consumption, leaching. Thiosulfate Leaching as an Alternative to Cyanidation: A Review of the Latest Development W.T. Yen1, G. Deschenes2 and Mark Aylmore3...

Gold Recovery from PCBs with Thiosulfate as Complexing Agent.

In this work, a hydrometallurgical process for the recovery of gold and silver from electronic scraps was studied. In place of cyanide, thiosulfate was chosen as complexing agent for gold. Thiosulfate leaching can be considered a non-toxic process and the gold dissolution rates can be faster than conventional cyanidation.

Separation of polythionates and the gold thiosulfate complex in gold ...

Separation of polythionates and the gold thiosulfate complex in gold thiosulfate leach solutions by ion-interaction chromatography. John W. O'Reillya, Matthew J. Shawa, Greg W. Dicinoskia, Andrew C. Grossea, Yasuyuki Miurab and Paul R. Haddad*a aAustralian Centre for Research on Separation Science, School of...

is there a green chemistry approach for leaching gold?

May 26, 2005 ... cyanide leaching of gold ores is examined in terms of green chemistiy. Also discussed is the potential of cyanide leaching beconling more environmentally friendly. The leaching reagents cyanide, thiocyanate, thiosulfate, and thiourea are compared using some of the principles of green chemistiy,...

337 Thiosulfate Leaching In Carbonaceous Gold-Bearing Ores ...

Thiosulfate Leaching In Carbonaceous Gold-Bearing Ores. Kaleb Jia Chaka, Unity University. Abstract. Gold leaching in metallurgical process is one of the major unit operations in processing plant designs. Conventional cyanidation method had been adopted and is being used widely. However, alternative lixiviants over...

The leaching and adsorption of gold using low concentration amino ...

1980s, and has been used in heap leaching processes by Newmont. Gold (Wan et al., 1994). Industrially, Barrick Gold has implemented a calcium thiosulphate retrofit at their Nevada operations (Choi,. 2013). A development of in situ gold leaching using ferric EDTA and ferric oxalate complexes in thiosulfate solutions has...

Untitled - Cnr

The inſluence of ammonia concentration on gold recovery (temperature=25°C; 2 M Na2S2O3; 0.1 M. CuSO, ). 4.4. Effect of ... The influence of ammonia on the leaching of gold has been investigated by varying the ... H.A. and Bubeev, P.P., Study of the kinetics of dissolution of gold in a low-temperature thiosulfate process.

MININGTEC.: Method of Gold Recovery from Thiosulfate Solution

Nov 26, 2008 ... The ammonium thiosulfate is one of the most favored alternatives. Before 1970's, the zinc cementation (Merill-Crow Process) was the most popular technology to recover the gold from the gold- cyanide pregnant solution. In recent gold production operation, carbon-in-pulp (CIP) and carbon-in-leach (CIL)...

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