use of thiosulfate in gold leaching

Contact Form

Gold recovery from thiosulfate leaching - The University of

2003/10/14 · Processes for recovering gold from copper-gold ores thiosulfate leaching or gold ores copper catalyzed thiosulfate leaching using ion exchange technology are disclosed. WO1991011539A1 1991-08-08 SEPARATION

Learn More

Cyanide-free gold recovery - CSIRO

2020/08/21 · It could allow small gold producers to mine low-grade, uneconomic or stranded gold deposits, as well as gold reserves in jurisdictions where cyanide-use is banned or restricted. Going for Gold builds on CSIRO's previous work tailoring a niche cyanide-free solution to Barrick Gold's Goldstrike Mine that's successfully been in operation since 2014.

Learn More

Thiosulfate - Wikipedia

Thiosulfate extensively forms complexes with transition metals hence a common use is dissolving silver halides in film photography developing. Thiosulfate is also used to extract or leach gold (sodium thiosulfate) and silver from their ores as a less toxic alternative to cyanide.

Learn More

Gold adsorption and elution in thiosulfate leaching system using

The use of thiosulfate as an alternative lixiviant for cyanide to treat complex refractory ores followed by the use of ion exchange resins (IX resins) for Proposing a novel adsorbent with characteristically easy solid-liquid separation, to recover gold from synthetic thiosulfate leaching solutions and gold

Learn More

PDF) Using Nickel as a Catalyst in Ammonium Thiosulfate

The use of copper as a catalyst for gold leaching in ammonium thiosulfate solution might cause the high consumption of thiosulfate. Also, the high copper consumption is resulted in the zinc

Learn More

Effect of Silver in Thiosulfate Leaching of Gold–Silver

However, there are few studies on the effect of silver content on gold dissolution rate in the thiosulfate leaching system. In this paper, the dissolution rate of pure gold, pure silver, and gold–silver alloys of silver compositions, 4, 8, 20, and 50 wt% are reported.

Learn More

Improvement of thiosulfate stability in gold leaching

Abstract Ammonium thiosulfate is a noncyanide lixiviant for gold leaching. However, the major problem with this leaching method has been the high consumption of reagents. To leach a mild-refractory copper-bearing gold ore, the authors used a reagent combination of 0.3M (NH 4) 2 S 2 O 3, 0.03M CuSO 4 and 3M NH 3 at pH 10.2 for 24 hours.

Learn More

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

Learn More

Phoenix Copper trials non-toxic gold leaching at Empire

2020/06/29 · Phoenix Copper trials non-toxic gold leaching at Empire. Base and precious metals group Phoenix Copper said processing on samples from its Empire polymetallic open pit resource in Idaho using a non-toxic ammonium thiosulfate (ATS) reagent resulted in high gold recoveries of 97.8% and 97.7%, and silver recoveries of 69.8% and 78.2%.

Learn More

Goldstrike TCM Leaching | Ausenco

Successful gold production uses patented thiosulfate processing method. Ausenco has been involved in Barrick’s gold processing operations at the Goldstrike Mine for nearly a decade. Goldstrike is Barrick’s largest and most productive mining operation, with gold production of more than 40 million ounces since 1987 It is located on the Carlin Trend,

Learn More

Thiosulfate-copper-ammonia leaching of pure gold and pressure

In this research cyanide-free leaching of pure gold and pressure oxidized refractory gold concentrate by thiosulfate-copper-ammonia solutions were examined. A quartz crystal microbalance (QCM) was used to study gold leaching as a factorial series where the best gold leaching rate (2.987 mg

Learn More

Sulfur Speciation in Mining Leachate Using Ion Chromatography

In the gold mining process, there is a tendency to switch from the cyanide leaching process to the thiosulfate leaching process due to the reduced toxicity.

Learn More

Effect of pyrite on thiosulfate leaching of gold and the role

The effect of pyrite and the role of ammonium alcohol polyvinyl phosphate (AAPP) during gold leaching in ammoniacal thiosulfate solutions were investigated using pure gold foils. The results showed that pyrite catalyzed the decomposition and also significantly increased the consumption of thiosulfate.

Learn More

Thiosulfate leaching of gold - A review | Request PDF

2001/02/01 · In previous studies, researchers have investigated some alternative gold leaching methods (including biological oxidation, halogens, thiourea, thiocyanate, ammonia and thiosulfate)

Learn More

GOLD LECHING FROM A SAUDI ORE BY THE

One significant advantage of thiosulfate leaching is its ability to treat preg-rob ores containing carbonaceous materials (Wan, 1993; West-Sell and Hackl, 2005). It is also thought that thiosulfate leaching might provide an alternative option for the leach of copper-bearing ores, which are not economical in cyanidation.

Learn More

Open Research: Alternative Copper(II) catalysts for gold

In the thiosulfate gold leaching process, thiosulfate is used to complex gold following electrocatalytic oxidation of the native metal by Cu(II)-ammines. Unfortunately, Cu(II) complexes also catalyse the undesirable conversion of

Learn More

Leaching and recovery of gold using ammoniacal thiosulfate leach

Thiosulfate leaching chemistry is compared with cyanide leaching, and the problems associated with obtaining a high yield of recovered gold using the former process are discussed. The present limitations of using Resin-in-Pulp (RIP) and Resin-in-Leach (RIL) systems with thiosulfate liquors

Learn More

Report "Thiosulfate Leaching as an Alternative to Cyanidation

Keywords: Thiosulfate, gold, extraction, reagent consumption, leaching. Thiosulfate Leaching as an Alternative to Cyanidation: Cyanidation: A Review of the Latest Development W.T. Yen1, G. Deschenes2 and Mark Aylmore3 1, Department of Mining Engineering, Queen's University, Kingston

Learn More

The role of ligands and oxidants in thiosulfate leaching of gold

possible application of iron(III)-EDTA-thiosulfate-thiourea as a leaching agent for gold, to achieve a much higher gold extraction (> 90%) under ambient leaching conditions and neutral solutions (pH 6-7) (35). A fundamental study on the use of iron(III)-oxalate-thiosulfate-thiourea for gold leaching has also been reported (36).

Learn More

Application of Thiosulphate Leaching in Gold Recovery | Request PDF

Thiosulfate leaching as an environmentally benign alternative to cyanide leaching has received particular attention in recent years. Research on leaching of refractory gold ore using thiosulfate indicates that gold recovery can reach 93.9% and gold content in the slag can be reduced to 0.30 g/t.

Learn More

An electrochemical study of the dissolution of gold in

2005/03/01 · 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

Learn More