Poducts

  • THIOSULPHATE LEACHING – AN ALTERNATIVE TO CYANIDATION

    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.

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  • Thiosulphate Leaching | SGS

    Thiosulfate leaching is a process that recovers gold from ore without the use of cyanide. SGS developed the thiosulfate leaching process because in some jurisdictions, increased regulation pressure means that cyanide cannot be used or transported. We are a global technical leader in the field of thiosulfate leaching.

  • Sodium Thiosulphate Gold 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

  • Thiosulfate leaching of gold—A review ScienceDirect

    Thiosulfate leaching can be considered a non-toxic 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 carbonaceous-type ores. In addition, thiosulfate can be cheaper than cyanide.

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  • Fundamental of thiosulfate leach of gold

    A Review of Ammoniacal Thiosulfate Leaching of Gol. ABSTRACT 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 . Get More Datail; Henan Fote Heavy Machinery Co., Ltd. Henan Fote Heavy

  • Ammoniacal thiosulphate leaching of gold ore

    The ammoniacal thiosulphate leaching of gold is dependant on both ammonia and thiosulphate concentration. The leaching is improved significantly at a particular ratio of ammonia to thiosulphate concentration and that ratio varies from ore to ore.

  • Optimizing the thiosulfate leaching of gold from printed

    01.10.2014· The optimum conditions for leaching of gold from PCBs were identified to be 72.71 mM thiosulfate, 10.0 mM copper (II) and 0.266 M ammonia. The initial rate of gold leaching was found to be 2.395 × 10 − 5 mol∙m − 2 ∙ s − 1 under the optimum conditions.

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  • Gold strike with thiosulphate CSIRO

    Within the tanks, the slurry interacts with thiosulfate and a fine, bead-like material called resin that collects the gold. At full capacity, 13,400 tons of ore can be processed daily, with leaching taking place simultaneously in two sets of seven tanks.

  • thiosulfate leaching Gold Refining Forum

    19.05.2011· I have some questions about thiosulfate leaching. 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. Any real answers

  • THIOSULFATE LEACHING OF SILVER FROM A SOLID RESIDUE

    The effect of thiosulfate ions concentration on Ag and Cu leaching was investigated for four different thiosulfate concentrations (0.25, 0.50, 0.75 and 1.00 mol/dm3). The leaching experiments were conducted at 25 oC and the leaching time was 6 hours.

  • Fundamental of thiosulfate leach of gold

    A Review of Ammoniacal Thiosulfate Leaching of Gol. ABSTRACT 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 . Get More Datail; Henan Fote Heavy Machinery Co., Ltd. Henan Fote Heavy

  • (PDF) A Review of Thiosulfate Leaching of Gold: Focus on

    Ahern, N. Thiosulfate Degradation during Gold Leaching in Ammoniacal Thiosulfate So lutions: A Focus Trithionate. Ph .D. Thesis, Univer sity of British Columbia, V anc ouv er, BC, Canada, October

  • Thiosulfate Leaching Thiosulfate leaching is an alkaline

    Thiosulfate leaching can produce comparable gold recovery to cyanidation and in some cases, it can produce a better recovery than cyanide leaching. This only occurs in naturally occurring carbonaceous substances such as preg-robbing ores which absorb more of the gold cyanide than the thiosulfate cyanide. By using thiosulfate instead of cyanide, a highly toxic chemical, the impact on the

  • FUNDAMENTAL ASPECTS OF GOLD LEACHING IN THIOSULFATE

    thiosulfate leaching of gold (Jiang et al, 1993a) 38 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 Figure 3.1 A diagram of

  • Sodium Thiosulfate Gold Leaching

    Sodium Thiosulfate Gold Leaching Thiosulfate in leaching gold mainemuslims org. An Electrochemical and SERS Study of the Gold Thiosulfate. Treatment of a Polysulphide Ore by Ammoniacal Thiosulfate. Thiosulfate copper ammonia leaching of pure gold and. Method of Gold Recovery from Thiosulfate Solution Blogger. Patent US20040237721 Anoxic leaching of precious metals. ALTA Gold

  • Barrick Thiosulfate Leaching of Double Refractory Ore

    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. Parameters Table 1 below outlines several heuristics obtained for the base case of cyanide leaching: optimal

  • (PDF) Thiosulphate leaching for gold hydrometallurgy

    Thiosulphate leaching for gold hydrometallurgy

  • Thermodynamic analysis of gold leaching by ammoniacal

    Abstract. Thiosulfate offers a nontoxic alternative to cyanide for processing gold ores. The mechanism of leaching gold using ammoniacal thiosulfate solution is driven by the Cu(II)-Cu(I) redox couple and is complicated by competing ligands such as NH 3 and S 2 O 3 2−.It is shown that an understanding of the copper speciation and sulfur speciation is required to optimize this system.

  • Gold leaching by organic base polythionates: new non

    Thiosulfate leaching of gold represents a potentially attractive alternative to a respective cyanation process at least for three types of auriferous ores. Firstly, in auriferous ores containing an organic carbon material, the recovery of gold by thiosulfate leaching is generally significantly higher due to the insensibility of the thiosulfate complex of gold to the preg-robbing or, in other

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  • THIOSULFATE LEACHING OF SILVER FROM A SOLID RESIDUE

    Noble metals such as silver, platinum group metals (PGM) and gold are recovered from primary and secondary resources by means of leaching. The richest sources of these metals, being a feed for leaching, are noble metals ores, by-products of nonferrous metals processing, anodic slimes from copper electroraffination and solid residues from hydrometallurgical circuits. The basic sources of silver

  • FUNDAMENTAL ASPECTS OF GOLD LEACHING IN

    applied potential, pH, temperature, and electrode rotating velocity on the gold leaching rate have been investigated. The effect of solution copper species on the anodic reaction of gold dissolution in thiosulfate solution was elucidated using the REQCM.

  • Thiosulfate Leaching Thiosulfate leaching is an

    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 preg-robbing ores as a leaching agent. The major chemical components of thiosulfate are common fertilisers which include ammonium thiosulphate and ammonium sulphate.

  • The modes of gold loss in the calcium thiosulfate

    The processing of gold is becoming more complicated due to the increasingly complex nature of the remaining gold-bearing ore bodies. This worldwide phenomenon is the driving force for the development of alternative technologies for the leaching and recovery of gold from so-called double refractory ores. Barrick Gold recently commercialized a unique calcium thiosulfate leaching plant to treat

  • thiosulfate gold leaching micheldeegens.nl

    Mar 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 preg-robbing ores as a leaching agent.

  • (PDF) Thiosulphate leaching for gold hydrometallurgy

    Thiosulphate leaching for gold hydrometallurgy

  • Thiosulfate-copper-ammonia leaching of pure gold and

    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).

  • Thermodynamic analysis of gold leaching by

    Thiosulfate offers a nontoxic alternative to cyanide for processing gold ores. The mechanism of leaching gold using ammoniacal thiosulfate solution is driven by the Cu (II)-Cu (I) redox couple and is complicated by competing ligands such as NH 3 and S 2 O 32−.

  • Factor Affecting Gold In Leaching Using Cyanide

    Thiosulfate Leaching Of Gold. 2013-1-30 1995have provided a summary review on non-cyanide lixiviants for leaching of gold. In addition to cyanide being haardous . and gold is eluted using Thiosulfate leaching of. Read More. Copper Elution For Increasing The Gold Rate At The. 2016-12-11 Abstract Temperature is the most important factor in the elution of gold cyanide from carbon with

  • US20080105088A1 Method for thiosulfate leaching of

    Method for thiosulfate leaching of precious metal-containing materials Download PDF Info Publication number US20080105088A1. US20080105088A1 US11/927,170 US92717007A US2008105088A1 US 20080105088 A1 US20080105088 A1 US 20080105088A1 US 92717007 A US92717007 A US 92717007A US 2008105088 A1 US2008105088 A1 US 2008105088A1 Authority US United States

  • Cyanide alternative leaching reagents for gold recovery

    tration. Besides gold, the co-extraction of further valuable metals via thiosulfate leaching will be observed and evaluated. Cyanide alternative leaching reagents for gold recovery from electronic waste Proceedings of EMC 2019 251 Figure 2: Samples used for experiments on TS gold leaching, from left to right: flue dust from e-waste crushing and milling processes, RAM and circuit boards Table 3