MB5X Grinding Mill

MB5X Pendulous Hanging Grinding Mill represents the most advanced grinding processing technology. The brand-new structural design ;

Hammer Mill

Hammer Mill is specially designed for coarse powder grinding and small size of sand production. Hammer Mill adopts some principles of crusher. Because of its special design,…

Ball Mill

Ball mill has been used in many industries for a long time, the technology is quite mature already. But there are still some problems, such as, lots of investors expressed…

MTM Series Trapezium Mill

Raymond mill is ever one classic powder grinding machine in the past. And most of modern mill are from it and MTM series milling machine is the most successful one. It optimized…

LM Vertical Roller Mill

Vertical Roller Mill is our newly-launched product which is applied as a solution to the technical issues such as low output and high energy consumption in the ordinary industry.…

MTW Series Trapezium Mill

MTW Series European Trapezium Grinding Mill (MTW Raymond Mill) is developed on the basis of our experts' long-term R & D experience, structure & performance analyses of traditional…

Gold leaching in thiosulfate solutions and its ...

Figure 2.25 Mechanism of gold leaching in ATS system in the presence of copper ion (Ouyang, 2001) 42 Figure 2.26 The electrochemical model for the copper catalysis mechanism of leaching gold with ammoniacal thiosulfate.( Aylmore et al, 2001a) 43 Figure 2.27 The effect of pyridine on gold leaching in ATS-Cu system 45

US6632264B2 - Gold recovery from thiosulfate leaching ...

May 19, 2011· out if Thiosulfate is a viable process for extracting gold. I would like to hear the facts,from someone that has used it in a real mining situation.Bits and pieces of information are what is dangerous with any process. I have edited this to include some information that may help the forum members in the future, and one in particular.

process for thiourea and thiosulphate leaching - Gold ...

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 …

(PDF) Thiosulphate leaching for gold hydrometallurgy ...

In thiosulfate gold leaching, Cu2+ ions are commonly used as oxidizing agents, while the thiosulfate ion acts as a ligand forming a soluble gold thiosulfate-ammonia complex (Aylmore and Muir, 2001). It was suggested that gold leaching in the absence of Cu2+ ions, with an external current acting as a oxidizer, is not possible

Associated Sulfide Minerals in Thiosulfate Leaching of ...

Thiosulfate leaching of gold--a review 167 T A B L E 6 Potentials for the reduction of gold complexes to gold metal f r o m a solution containing gold at 10 -s M Ligand Ligand Concentration E° (versus SCE) E (versus SCE) (M) Thiourea Thiocyanate Thiosulfate Chloride Cyanide 10 -1 10 -2 10 -1 10 -2 10-1 10 -2 10 -1 10 -2 10 -1 10 -2 (v) (v) 0. ...

Thiosulfate-copper-ammonia leaching of pure gold and ...

Oct 06, 2016· First time any company in the western world produces gold on a commercial scale using thiosulfate From left to right: Chief Metallurgists Janet Baron and Averne Flaharty-Escobar, Director of Strategic Technology Solutions Yeonuk Choi and Senior Director of Strategic Technology Solutions Peter Kondos accept the MetSoc Innovation Award on behalf of their team that developed the thiosulfate ...

thiosulfate leaching gold process - cafeole-koeln.de

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.

Optimizing the thiosulfate leaching of gold from printed ...

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. However there are also ...

Goldstrike TCM Leaching | Ausenco

In the sodium thiosulfate and ammonium thiosulfate tests, it was possible to extract 70 and 75% of the gold contained in the PCB, respectively, using solutions containing 0.12 M of sodium or ammonium thiosulfate, 0.2 M of ammonium and 20 mM of copper sulfate in 4 hours of leaching, at a temperature of 30(2(C and pH 10.

Associated Sulfide Minerals in Thiosulfate Leaching of ...

Sodium thiosulfate (sodium thiosulphate) is an inorganic compound with the formula Na 2 S 2 O 3. x H 2 O. Typically it is available as the white or colorless pentahydrate, Na 2 S 2 O 3 ·5H 2 O.The solid is an efflorescent (loses water readily) crystalline substance that dissolves well in water.. Sodium thiosulfate is used in gold mining, water treatment, analytical chemistry, the development ...

Thiosulfate-copper-ammonia leaching of pure gold and ...

Successful gold production uses patented thiosulfate processing method Project Goldstrike TCM Leach Project. Location Elko, Nevada, United States . Timeframe 2011 - 2015. Client ... involved a $620 million investment that included major upgrades to the Goldstrike leaching circuits and new infrastructure.

Thiosulfate Leaching of Gold and Silver from Waste Mobile ...

Processes 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 relatively high rates of ...

Thiosulphate Leaching | Mining | SGS

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 within 3.0 hours.

Ammoniacal thiosulphate leaching of gold ore

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% ...

Non-cyanide gold leaching agent_The Nile Co., Ltd.

Thiosulfate leaching to recover gold from ores is known for several decades but extensive researches have been started only for the past two decades. 4. The process of recovering gold from mobile phone PCBs is an innovative approach to obtain the precious metals. 18 Abhishek Tripathi.

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

The observed leaching results show that with increasing thiosulfate ions concentration the leaching efficiency increases for both Ag and Cu. At the highest thiosulfate ions concentration the leaching recoveries of Ag and Cu were 60 and 35%, respectively. It confirms the possibility of thiosulfate leaching application for silver extraction.

The treatment of copper-gold ores by ammonium thiosulfate ...

leaching of gold as its absence makes gold passive by the build up of sulphur coating on the surface as a result of decomposition of thiosulphate. It is known that thiosulphate is a meta-stable species that readily undergoes decomposition in aqueous solutions. Ammonia adsorbs onto the gold surface preferentially over

Sodium thiosulfate - Wikipedia

Academia.edu is a platform for academics to share research papers.

thiosulfate leaching - Gold Refining Forum.com

In thiosulfate gold leaching, Cu2+ ions are commonly used as oxidizing agents, while the thiosulfate ion acts as a ligand forming a soluble gold thiosulfate-ammonia complex (Aylmore and Muir, 2001). It was suggested that gold leaching in the absence of Cu2+ ions, with an external current acting as a oxidizer, is not possible

thiosulfate leach of gold plate - YouTube

Oct 01, 2014· The gold leaching process followed the pseudo-second order kinetic model at the low concentration range of the reactants such as 40–60 mM thiosulfate, 5–7 mM copper(II) and 0.22–0.247 M ammonia, and the pseudo-first order kinetic model at the mid concentration range (60–70 mM thiosulfate, 7–9 mM copper(II) and 0.247–0.263 M ammonia).

Sodium Thiosulphate Gold Leaching

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.

THIOSULFATE LEACHING OF GOLD--A REVIEW__

Feb 01, 2001· Thiosulfate leaching can be considered a non-toxic process, the gold dissolution rates can be faster than conventional cyanidation and, due to …

Gold strike with thiosulphate - CSIRO

The thiosulfate-gold complex formed in thiosulfate leaching is not attracted to carbon so this failure to remove the carbon is no longer an issue. Thus, the use of thiosulfate with autoclave-processed double refractory ores does not result in the loss of the gold complex in the tails.

US6632264B2 - Gold recovery from thiosulfate leaching ...

Thiosulfate leaching can be considered a nontoxic 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 carbonaceoustype ores.

Barrick Thiosulfate Leaching of Double Refractory Ore

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 …