• The thiosulfate leaching of gold from waste PCBs exhibits that gold could be leached with good recovery under specific conditions. Recovery of gold was found to be highly dependent on the concentration of copper sulfate, ammonium thiosulfate, pH and pulp density.
Get PriceMar 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 pregrobbing ores as a leaching agent. The major chemical components of thiosulfate are common fertilisers which include ammonium thiosulphate and ammonium sulphate.
Get PriceAug 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.
Get PriceThe kinetics and mechanism of gold leaching in the ammoniathiosulfatecopper (ATSCu) system have been studied using the rotating electrochemical quartz crystal microbalance (REQCM). Anodic polarization, cathodic polarization and leaching experiments were included in this study.
Get PriceTHIOSULPHATE 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
Get PriceThe CSIROpatented cyanidefree thiosulphate process is adding value to Barrick Gold Corporation‘s gold operation. The first gold bar produced with the thiosulphate process was poured in late ...
Get PriceThiosulfate 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. Nomenclature
Get PriceSodium thiosulfate is used in gold mining, water treatment, analytic chemistry, the development of silverbased 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 …
Get PriceTHIOSULFATE LEACHING In recent years, thiosulfate has been considered the most attractive alternative to cyanide for leaching gold, with many investigations taking place Alternative lixiviants to cyanide for leaching gold ores
Get PriceProcesses for recovering gold from coppergold ores thiosulfate leaching or gold ores copper catalyzed thiosulfate leaching using ion exchange technology are disclosed. The processes include subjecting the goldbearing and copperbearing thiosulfate solution to a pH and/or temperature adjustment to reduce tetrathionate concentration in the thiosulfate solution prior to contacting with an …
Get PriceFeb 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, nontoxic process to remove gold from gold plated objects and ...
Get PriceThiosulfate 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.
Get PriceThiosulfate leaching of gold from waste mobile phones Ha , Lee J.C., Jeong J., Hai , Jha 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, Gwahangno, Yuseonggu, Daejeon 305350, South Korea; Metal ...
Get PriceMay 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.
Get PricePDF | Ammoniacal thiosulphate leaching of gold finds a better substitute as it is nontoxic and environmentally safe as compared to the toxic cyanide system for gold extraction. In the present ...
Get PriceThis 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 ...
Get PriceNov 09, 2015· i am using sodium cyanide for gold leaching ,i know that it is very dangerous and harmful to envoirnment,so i want to know about other chemical which can leach gold and silver i want to know how about thioleaching. Top. ... I expect Iron content will have a profound effect on a thiosulfate leach.
Get PriceThe substitution method of recovering gold from thiosulfateethylenediamine (en)Cu 2+ leaching solution using copper powder was studied. The effects of reaction time, stirring speed, pH, thiosulfate concentration, en/Cu 2+ molar ratio, Cu/Au + mass ratio, and temperature on gold
Get PriceThe thiosulfategold 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 autoclaveprocessed double refractory ores does not result in the loss of the gold complex in the tails.
Get PriceAbstract. Thiosulfate leaching is widely recognized as one of the most promising alternatives to cyanidation for gold leaching, of which the action of cyclic barren solution is of great importance as far as its commercial application is concerned.
Get Pricelixiviant 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
Get PriceThiosulfate 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.
Get PriceThe gold industry has been seeking alternative reagents for leaching gold from lowgrade 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.
Get PriceProcesses are provided for recovering precious metals from refractory materials using thiosulfate lixiviants. The processes can employ heap leaching or lixiviants that include one or more blinding agents.
Get Pricelurgical gold extraction routes utilize a leaching step to produce a goldbearing solution as an intermediate product while the recycling of secondary gold from electronic and precious metal scrap is based on the selective and fast dissolution of the precious metal. Therefore, A Method for Leaching or Dissolving Gold from Ores or Precious
Get PriceThiosulfate 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. In addition, thiosulfate can be cheaper than cyanide.
Get PriceAmmonium thiosulphate is an alternative gold leaching Laaviant used to replace cyanide. 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
Get Pricequeries. The aim of this paper is to study leaching of gold with cyanide replacing alternatives such as ammonium thiosulfate, chloridehypochlorite, thiourea and thiocyanate to provide new cases for the tool. The behaviour of gold was examined with electrochemical tests and weight loss measurements a using
Get PriceGold leaching was primarily limited by the volume of lixiviant contacting the carbonaceous 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
Get PriceGold and silver leaching in thiosulfate solution is preferable kinetically and environmentally if conducted in a closed vessel 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% ...
Get PriceThe proposed method of the gold recovery comprises leaching with a solution of a mixture of sodium and ammonium hydrosulfite and thiosulfate, by sorption of the thiosulfategold complex on a highly basic anion exchanger and by isolation of the highly basic anion exchanger, the sorption being carried out 210 hours after the leaching. Then the ...
Get PriceThiosulfate 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 ...
Get PriceThe 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.
Get Price