THIOSULPHATE LEACHING – AN ALTERNATIVE TO CYANIDATION IN GOLD PROCESSING ALTERNATIVES TO CYANIDE IN GOLD PROCESSING THIOSULPHATE LEACHING 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
The results for leaching gold with alternative reagents, sodium thiosulfate and ammonium hydroxide, show that the best extraction was achieved at 0.1M sodium thiosulfate and 0.2M ammonium hydroxide, when adding 0.1M of hydrogen peroxide as an oxidation agent, obtaining approximately 11% of gold.
A Review of Ammoniacal Thiosulfate Leaching of Gold . A Review of Ammoniacal Thiosulfate Leaching of A Review of Ammoniacal Thiosulfate Leaching of Gold or ammonium thiosulfate during gold leaching, Live Chat. The treatment of coppergold ores by ammonium thiosulfate .
The target of this review is to point out the best cyanide-free processes of following methods and reagents: Bioleaching, Chlorination, Aqua Regia, Bromine, Thiocyanate, Thiosulfate and Thiourea leaching. For this propose, the gold leaching reagents are described and discussed in terms of their environmental and economical points of view.
COMPARISON OF CYANIDE AND THIOSULPHATE LEACHING FOR GOLD PRODUCTION (A Literature Review) by Simo Keskinen ... currently the main gold leaching process in the world. However, gold cyanidation process ... review one promising alternative lixiviant, …
Ammonium thiosulfate (ammonium thiosulphate in British English) is an inorganic compound with the formula (NH 4) 2 S 2 O 3.It is white crystalline solid with ammonia odor, readily soluble in water, slightly soluble in acetone and insoluble in ethanol and diethyl ether.
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.
Ammonium thiosulfate is a white crystalline solid inorganic compound with the chemical formula H 8 N 2 O 3 S 2, and CAS 7783-18-8. The slightly toxic compound is used in photography, leaching of gold and silver, and as a fertilizer.
Apr 07, 2014· The article present a review on own experimental and some published data which are related with the gold leaching. It is well-known that the most common and usual process of the leaching with cyanide can be dangerous, needs a great water consumption, and additional costs for remediation of the poisoned and toxic sites. ... Thiosulfate leaching ...
Feb 01, 2001· Thiosulfate leaching of gold—A review Thiosulfate leaching of gold—A review Aylmore, M.G; Muir, D.M 2001-02-01 00:00:00 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 …
Sodium thiosulfate is used in gold mining, water treatment, analytic chemistry, the development of silver-based photographic film and prints, and medicine. The medical uses of sodium thiosulfate include treatment of cyanide poisoning and pityriasis. It is on the World Health Organization's List …
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.
Gold leaching in thiosulfate solutions was evaluated environmentally and kinetically in different ways: (1) applying a closed system to leach gold (2) evaluating the environmental and metallurgical optimum thiosulfate leaching characteristics for pure gold and pure silver and gold …
May 19, 2011· 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 getting the gold out of the precipitates seems to be a real pain.
Fig 9 The model of electrochemical catalytic mechanism of ammoniacal thiosulfate leaching of gold. Thiosulfate ions react with Au+ ions on the anodic surface of gold and enter the solution to form Au(S2O3)23-. The Cu(NH3)42+ present in solution acquires electrons on the cathodic portion of the gold surface and is directly reduced to Cu(NH3)2 ...
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 ...
Thiosulfate leaching of gold from waste mobile phones Ha V.H., Lee J.-C., Jeong J., Hai H.T., Jha M.K. Institute for Environmental Science and Technology, Hanoi University of Technology (HUT), 1 - Dai Co Viet, Hanoi, Viet Nam; Mineral Resources Research Division, Korea Institute of Geoscience and Mineral Resources (KIGAM), 92, Gwahang-no, Yuseong-gu, Daejeon 305-350, South Korea; Metal ...
The use of electrochemical techniques in the selective recovery of gold from a solution containing thiosulphate, ammonia, and copper, obtained from the leaching of printed circuit boards from mobile phones using ammoniacal thiosulphate, are shown in this work. First, cyclic voltammetry tests were performed to determine the potential of electrodeposition of gold and copper, and then ...
Chlorination, Aqua Regia, Bromine, Thiocyanate, Thiosulfate and Thiourea leaching.For this pro- pose, the gold leaching reagents are described and discussed in terms of their environmental and economical points of view. As result of this comparison, thiourea stands out as the most promising alternative gold leaching reagent to cya nide. Keywords
Apr 27, 2007· 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 …
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 oxide, sulfide ...
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.
Alternative Case: Thiosulfate Leaching Literature Review The purpose of the thiosulfate leaching method is to deliver better gold recovery from double refractory ore. Double refractory ore is comprised of sulfidic and carbonaceous materials. The use of thiosulfate solution combats the preg-robbing process caused by cyanide treatment on
Apr 01, 2003· Read "Leaching and recovery of gold using ammoniacal thiosulfate leach liquors (a review), Hydrometallurgy" on DeepDyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips.
Gold leaches rapidly as the gold thiosulfate complex, which, because of its low affinity for graphitic carbon, does not suffer the preg-robbing phenomenon that is a feature of these ores in cyanide leach circuits. The mild leaching conditions are also compatible with a gold-recovery process involving direct recovery from the leach pulp by ...
lixiviant for gold leaching which efficiently recovers gold. 3. but this is not an economical route for the gold leaching due to its high consumption and cost. 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
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. ...
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.
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