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. In addition, thiosulfate can be cheaper than cyanide.
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 study, an attempt is made to assess the feasibility of ammoniacal thiosulphate leaching of gold ore samples from two
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 hours.
Feb 01, 2011· Thiosulphate leaching of gold in the presence of orthophosphate and polyphosphate Thiosulphate leaching of gold in the presence of orthophosphate and polyphosphate Feng, D.; van Deventer, 00:00:00 The effects of sodium orthophosphate and hexametaphosphate, were investigated in ammoniacal thiosulphate leaching of pure gold and a sulphide gold ore.
Gold cyanidation (also known as the cyanide process or the MacArthurForrest process) is a hydrometallurgical technique for extracting gold from lowgrade ore by converting the gold to a watersoluble coordination is the most commonly used leaching process for gold extraction.. Production of reagents for mineral processing to recover gold, copper, zinc and silver represents ...
A process of biooxidation followed by thiosulfate leaching of gold from refractory gold concentrate was investigated. Mineralogical studies on the concentrate showed that very fine gold grains (10 μm) were encapsulated in the pyrite and arsenopyrite minerals while the amount of monomer gold was only 21%.It was identified as a highsulfur finesized wrapped type refractory gold concentrate.
Gold Ore Leaching Eazy Process. Extraction of gold using cyanide This process of dissolving the gold using cyanide is known as leaching. Sometimes some other precious metals can also be leached along wit. h the gold, for example silver. This process of leaching is done in leaching tanks or by heap leaching where sodium cyanide
Thiosulphate 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 thiosulphate leaching process are benign. This technology offers great potential in those jurisdictions where the use of cyanide is banned outright, or is subject to intense negative ...
lurgical 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
alternative to cyanidation for some gold bearing ore bodies. Whether the leaching is performed in stirred tank reactors or heaps, the size and type of equipment needed for a thiosulphate leaching flowsheet is very similar to a conventional cyanide leach. SGS is a global technical leader in the field of thiosulphate leaching, and our
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.
As part of the thiosulphate process at Goldstrike, goldbearing ore is heated as a thick slurry of ore, air, water and limestone in large pressure chambers or autoclaves and then pumped into the new 'resininleach' circuit that takes place inside large stainless steel tanks.
The processing of gold is becoming more complicated due to the increasingly complex nature of the remaining goldbearing ore bodies. This worldwide phenomenon is the driving force for the development of alternative technologies for the leaching and recovery of gold from socalled double refractory ores. Barrick Gold recently commercialized a unique calcium thiosulfate leaching plant to treat ...
Ammoniacal thiosulphate solution allows the solubilization of gold as stable anionic complex. Leaching of gold occurs at appreciable dissolution rates. The aim of this work is devoted to a preliminary evaluation of the feasibility of thiosulphate leaching for the extraction of gold from precious metals ores on a laboratory scale.
