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Alternative lixiviants to cyanide for leaching gold ores M.G. Aylmore Placer Dome Technical Services Ltd., 323 Alexander St., Vancouver, BC, Canada V6A 1C4 Over 25 alternative lixiviant processes to cyanide have been tested in the laboratory, some of which have been successful for niche applications.
Consequently, gold recovery by thiosulphate leaching is usually slightly less efficient than can be achieved with cyanide, and higher concentrations of the lixiviant are needed to produce comparable leach kinetics. One of the situations where thiosulphate . leaching yields higher gold recovery than cyanide is the treatment of preg-robbing ores.
Gold recovery by catalytic copper ammonium thiosulphate solution has been studied. Such a process strategy is very attractive for leaching certain difficult-to-treat ores and presents lessened lixiviant toxicity compared to cyanide. Newmont Gold Company has evaluated the ammonium thiosulphate heap leach process for gold recovery from low- grade carbonaceous sulphidic refractory ores following ...
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 ...
Copper-catalyzed thiosulfate leaching is being investigated by the U.S. Bureau of Mines as a potentially economical and environmentally safe method for heap leaching or in situ leaching of low-grade oxidized gold ores. Six variables were investigated in fractional factorial screening tests ...
Apr 25, 2017· How to Leach Gold Ore With Chlorination ... The use of chlorine is both the cheapest and most plentiful method for leaching gold. When you mix sodium chloride and hydrochloric acid together, you produce a form of electrolysis that removes gold from rock and soil.
PDF | Ammoniacal thiosulphate leaching of gold finds a better substitute as it is non-toxic and environmentally safe as compared to the toxic cyanide system for gold extraction. In the present ...
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.
Using Nickel as a Catalyst in Ammonium Thiosulfate Leaching for Gold Extraction ... On a 100mass%-75mm of silicate type gold ore containing 16g/t Au and 0.2mass% of Fe and C, the nickel catalyzed ammonium thiosulfate solution could extract 95% of gold with the 1.2kg/t-ore of ammonium ... Using Nickel as a Catalyst in Ammonium Thiosulfate ...
Aug 02, 2019· Thiosulphate dissolves the fine gold out of ores (the gold that has not recovered by gravity) at similar rates to conventional techniques. It's safe and lowers environmental impacts. The method has undergone intensive testing in the laboratory to understand its leaching performance in association with reagent recovery and recycle.
A diagnostic leaching showed that partial oxidation of the sulphide minerals in a gold ore was beneficial for thiosulphate leaching of gold. A pre-treatment process with oxidative ammoniacal solution enhanced the thiosulphate leaching of the sulphide ore, while the thiosulphate consumption was substantially reduced.
An improved thiosulphate leach process for the recovery of gold from ores and other gold-bearing materials, characterised in that the leach solution comprises thiosulphate, thiourea or a reagent chemically related thereto, and an oxidant that does not oxidise thiosulphate, the process producing a pregnant leach solution from which gold may be recovered.
Hydrometallurgy of gold 67 Thiosulphate The first reported use of thiosulphate for precious metal extraction dates back to the beginning of the century. In that method, known as Patera's process, the ore was first roasted in a chloride atmosphere and just after a thiosulphate leaching was used to recover gold and silver (Zipperian et al. 1988).
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 .
Gold cyanidation (also known as the cyanide process or the MacArthur-Forrest process) is a hydrometallurgical technique for extracting gold from low-grade ore by converting the gold to a water-soluble coordination complex. It is the most commonly used leaching process for gold extraction.
In this study, thiosulphate leaching of gold from the refractory Kaletaș ore was evaluated as an alternative to cyanide leaching. The extraction of gold in the thiosulphate leaching system was similar to that in cyanide leaching system with the highest gold extraction of 69.6 % in thiosulphate medium.
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.
In this article, a comprehensive review of fundamental studies of leaching of gold from different ores in ammonia-free thiosulfate solutions is presented with special emphasis on factors that ...
Oxidized gold ores are ... thiosulphate as lixiviant, ferric as oxidant and thiourea as a catalyst for gold oxidation might be usable for anaerobic leaching of gold ores. This work also indicated that the ... IN PLACE LEACHING OF OXIDIZED GOLD DEPOSITS 45 systems under anaerobic conditions. The oxide gold ore
Jul 27, 2012· Sodium thiosulfate will leach gold (dissolve gold), in the use of sodium thiosulfate to leach ore they use air or oxygen, many times ammonia is added, many time's copper is used as a catalyst for the reaction, keeping the pH regulated is also important for the leach to work.
Jul 27, 2018· The substitution method of recovering gold from thiosulfate-ethylenediamine (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
As part of the thiosulphate process at Goldstrike, gold-bearing ore is heated as a thick slurry of ore, air, water and limestone in large pressure chambers or autoclaves and then pumped into the ...
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 advantages including its lower toxicity and greater efficiency with gold deposits associated with preg-robbing ores. The thiosulphate 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. However there are also ...
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