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Thiosulfate leaching of gold - A review | Request PDF

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.

THIOSULPHATE LEACHING - sgs.com

leaching process is more complex and less robust than the cyanide leaching process, and is therefore more difficult to optimize and more sensitive to operate. The leach process involves a chemical reaction between metallic gold and the thiosulphate anion, with oxygen as …

thiosulfate leaching - Gold Refining Forum.com

May 19, 2011· I have some questions about thiosulfate leaching. Has anyone here actually used thiosulfate for leaching gold ore,and had positive results,that can be repeatable as a real leaching process? Has anyone found a real working precipitation process to recover the gold,that works well,and is dependable? Also

METHOD FOR LEACHING PRECIOUS METALS CONTAINING ORES …

Aug 08, 2019· The present invention is directed to leaching precious metals, and in particular, to improving the process of leaching precious metals, including gold, from gold bearing ores and other gold bearing materials, by using thiosulfate based leaching solutions, with or without copper cations, in combination with alkaline earth metals hydroxides.

Bioleaching - Wikipedia

Bioleaching is the extraction of metals from their ores through the use of living organisms.This is much cleaner than the traditional heap leaching using cyanide. Bioleaching is one of several applications within biohydrometallurgy and several methods are used to recover copper, zinc, lead, arsenic, antimony, nickel, molybdenum, gold, silver, and cobalt.

Sodium Thiosulphate Gold Leaching

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 which can make cyanide unattractive in some circumstances.

Ammoniacal thiosulfate and sodium cyanide leaching of …

leaching behavior of carbonaceous matter within the ore. Carbonaceous matter obtained by acid demineralization of Goldstrike ore was leached using either an ammoniacal thiosulfate system or a sodium cyanide system. Leaching of the carbonaceous matter was conducted in batch experiments, as well as in columns at various flow rates to compare the ...

Recent advances in the development of an alternative to ...

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.

Thiosulphate Leaching | Mining | SGS China

Thiosulfate leaching is an alkaline process (usually operated in the pH 8 to 10 range) so there are no concerns with corrosion of equipment in the recovery operation; The main chemical components of the thiosulfate leaching process (ammonium thiosulfate and ammonium sulphate) are common fertilizers.

process for thiourea and thiosulphate leaching - Gold ...

Nov 09, 2015· The only smell present during the leach time is ammonia. PH has every thing to do with using thiosulfate. If you let your leach run too long,and let the PH drop too much during run time,it will then pull in some iron. Run time,PH,and temperature are the keys to using thiosulfate. P.S. All of my observations are with sodium thiosulfate.

Gold leaching by organic base polythionates: new non-toxic ...

Gold leaching is the key stage in process of gold mining. There are a few well-reputed leaching methods using a variety of different reagents. Nowadays the most popular industrial processes include cyanide, thiourea, and thiosulfate leaching methods.

Barrick Thiosulfate Leaching of Double Refractory Ore

temperature of 50-70⁰C.7 The 2009 Patent15 mentions that the thiosulfate concentration in the leaching container may have to be subsidized with more thiosulfate as the test goes along "to prevent the re- precipitation of gold as its sulfide." The overall thiosulfate leaching process in shown in Fig. 3.

GOLD LECHING FROM A SAUDI ORE BY THE NONPOLLUTING ...

Gold leaching from a Saudi ore by the nonpolluting thiosulfate process 61 thiosulfate media other than copper and ammonia (Zhang et al., 2005; Chandra et al., 2005). Carbonaceous sulfide ores after oxidative pre-treatment are typically very easy to leach with thiosulfate, while complex metal sulfide ores are much more difficult to treat.

Barrick Thiosulfate Leaching of Double Refractory Ore

Barrick requests the Leaching Team to optimize the thiosulfate leaching process for double refractory ores. In 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.

Thiosulphate Leaching | Mining | SGS

Thiosulfate leaching is an alkaline process (usually operated in the pH 8 to 10 range) so there are no concerns with corrosion of equipment in the recovery operation; The main chemical components of the thiosulfate leaching process (ammonium thiosulfate and ammonium sulphate) are common fertilizers.

Thiosulfate Leaching Thiosulfate leaching is an alkaline ...

Mar 17, 2019· Thiosulfate Leaching Thiosulfate leaching is an alkaline process which removes gold from carbonaceous ores instead of using cyanide. It is less destructive and toxic, and has a higher efficiency with preg-robbing ores as a leaching agent. The major chemical components of thiosulfate are common fertilisers which include ammonium thiosulphate and ammonium sulphate.

Ammonium Thiosulfate Heap Leaching - Technische ...

A Review of the Chemistry, Electrochemistry and Kinetics of the Gold Thiosulfate Leaching Process. Breuer, P. L. / Jeffrey, M. I. / TMS | 2003. print version. 155 Thermodynamic Studies of the Gold(III)/(I)/(0) Redox System in Ammonia-Thiosulfate Solutions at 25^oC.

Bioleaching - Wikipedia

Bioleaching is the extraction of metals from their ores through the use of living organisms.This is much cleaner than the traditional heap leaching using cyanide. Bioleaching is one of several applications within biohydrometallurgy and several methods are used to recover copper, zinc, lead, arsenic, antimony, nickel, molybdenum, gold, silver, and cobalt

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 ...

Sodium thiosulfate for small-scale gold leaching from ...

I recently read that sodium thiosulfate can be used for gold and silver leaching in much the same way as cyanide, but with no worries about toxicity. This intrigues me: aqua regia is a pain to work with, and cyanide is too toxic for an amateur, but thiosulfate is already one of my favorite reagents

WO2013023297A1 - Process of leaching precious metals ...

The invention relates to modifications of a non-ammoniacal thiosulfate process of leaching precious metals (e.g. gold or silver) from precious metal-containing ores. The process involves leaching the ore with an aqueous lixiviant containing a soluble thiosulfate other than ammonium thiosulfate, a copper compound and an organic compound that serves as a copper ligand (i.e. a ligand-forming ...

Leaching behaviour of sulphides in ammoniacal thiosulphate ...

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.

Thiosulfate leaching of gold—A review - ScienceDirect

The thiosulfate leaching process it catalysed by copper and has several advantages over the conventional cyanidation process. 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 ...

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

ABSTRACTThis 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 oxide, sulfide, carbonaceous, and refractory ores/concentrates ...

Thiosulphate Leach Process - Zhang, Hongguang

Nov 22, 2007· The recovered values of gold after leaching under such conditions are typically 89.6-98%. Examples 1 to 4 described the technical details of the improved thiosulfate leaching process and provide details for the leaching of pure gold powder (Example 1) and ore (Examples 2 to 4), with the ore samples prepared by dry grinding.

Gold extraction - Wikipedia

The cyanide process is the industry standard. 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.

Thiosulphate Leaching | Mining | SGS Turkey

Thiosulfate leaching is an alkaline process (usually operated in the pH 8 to 10 range) so there are no concerns with corrosion of equipment in the recovery operation; The main chemical components of the thiosulfate leaching process (ammonium thiosulfate and ammonium sulphate) are common fertilizers.

US Patent for Process of leaching precious metals Patent ...

The invention relates to modifications of a non-ammoniacal thiosulfate process of leaching precious metals (e.g. gold or silver) from precious metal-containing ores. The process involves leaching the ore with an aqueous lixiviant containing a soluble thiosulfate other than ammonium thiosulfate, a copper compound and an organic compound that serves as a copper ligand (i.e. a ligand-forming ...

leaching gold thiosulphate

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.

Leaching of Sludge from the AVR Process with Ammonium ...

process option and might have better results than conventional processes with cyanide. Keywords—AVR, ammonium thiosulfate, leaching I. INTRODUCTION The recycling of cyanide in the leaching circuit has great potential for economic and environmental benefits …

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