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fundamental of thiosulfate leach of gold

  • A fundamental study was undertaken of the dissolution of gold using a novel thiosulfate leaching system that utilises ferric oxalate as the oxidant in place of the traditional cupric ammine. The key advantage of the ferric oxalate system is that the thiosulfate consumption is negligible compared to the cupric ammine system.

  • Fundamental aspects of thiosulfate leaching of Open Collections. leach gold and silver Molleman and Dreisinger, 2002; however thiosulfate . of the epithermal sulfidic gold/silver ore at Newmont's Yanacocha mine the ore. ... Thiosulfate leaching of gold represents a potentially attractive alternative to a. thiosulfate leach of gold plate. Feb 24 ...

  • Thiosulfate leaching offers a number of benefits related to gold recovery yields and environmental concerns: Thiosulfate leaching of gold ores has great potential to …

  • Key Parameters in Thiosulfate Leaching The parameters controlling the thiosulfate leaching of gold are: reagent concentrations (i.e., thiosulfate, ammonia and cupric ion), pH, Eh, dissolved oxygen, pH and retention time.

  • Title Fundamental aspects of gold leaching in thiosulfate solutions Creator Li, Cheng Date Issued 2003 Description The kinetics and mechanism of gold leaching in the ammonia thiosulfate copper (ATS Cu) system have been studied using the rotating …

  • 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 ...

  • The 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 thiosulfate-gold complex on a highly basic anion exchanger and by isolation of the highly basic anion exchanger, the sorption being carried out 2-10 hours after the leaching.

  • The influence of thiosulfate, ammonia and copper sulfate concentrations on the leaching of gold from PCBs of waste mobile phones was investigated. Gold extraction was found to be enhanced with solutions containing 15-20 mM cupric, 0.1-0.14M thiosulfate, and 0.2-0.3 M ammonia.

  • The sustainability of the gold industry is being challenged by reducing grades, more complex ores and increasingly stringent environmental conditions.

  • A fundamental study was undertaken of the dissolution of gold using a novel thiosulfate leaching system that utilises ferric oxalate as the oxidant in place of the traditional cupric ammine.

  • The kinetics and mechanism of gold leaching in the ammonia-thiosulfate-copper (ATS-Cu) system have been studied using the rotating electrochemical quartz crystal microbalance (REQCM). Anodic polarization, cathodic polarization and leaching experiments were included in this study.

  • The role of ligands and oxidants in thiosulfate leaching of gold Gamini Senanayake A.J. Parker Cooperative Research Centre for ... (pH 6-7) (35). A fundamental study on the use of iron(III)-oxalate-thiosulfate-thiourea for gold leaching has also been reported (36). Figures 1-6 clearly show the complex behaviour of thiosulfate leaching of gold ...

  • Feb 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, non-toxic process to remove gold from gold plated objects and ...

  • the leaching behavior of gold in the thiosulfate and chloride the kinetic data were extrapolated back to zero time (where systems is affected by the purity of the gold …

  • Using Nickel as a Catalyst in Ammonium Thiosulfate Leaching for Gold Extraction Harunobu Arima1, Toyohisa Fujita2 and Wan-Tai Yen3 1Graduate Student, Queen's University.Present address: Akita Zinc Co., Ltd., Akita 011-8555, Japan

  • Kinetics of gold leaching A recent series of papers by Jeffrey's group9–13 discusses the fundamental kinetic and electrochemical aspects of gold and silver leaching with ammoniacal thiosulphate and compares alternative lixiviants such as cyanide and chloride/hypochlorite.12 When the rate of gold dissolution in dilute reagent compositions ...

  • 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.

  • Today, the most common (>%90) method preferred for production of gold from ores is cyanide leaching. Cyanide leaching with its well-known chemistry has been used industrially since the late 19th ...

  • A Method for Leaching or Dissolving Gold from Ores or Precious Metal Scrap ... Several reagents are known to leach native gold from gold-bearing ores. It ... ous solutions of ammonium thiosulfate6 according to the overall reaction scheme given in Reaction 2.

  • 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.

  • this past research has focused on the leaching of gold from ores with thiosulfate and fundamental studies of the complex system chemistry and interactions with minerals, particularly the detrimental

  • The mechanism of thiosulfate gold leaching is examined, the advantages of this process comparing with cyanidation are noted, and the examples of its commercial putting into practice are presented ...

  • US5308381A Ammonia extraction of gold and silver from ores and ... Furthermore, the leaching kinetics of gold and silver with cyanide is very slow. .... 3.0 gram moles per liter; that or ammonium sulfate 0.5 gram moles per liter.

  • However, when thiosulfate is being used to leach gold ores, copper may be either added as a catalyst for gold leaching or may be leached from the ore itself (copper-gold ore treatment). As a result, the slurry may contain 0.2 to 2 g/L copper and this copper may greatly accelerate the oxidation of thiosulfate.

  • equivalent rates of gold leaching, and a typical thiosulphate leach solution will have a reagent concentration of 5 to 20 g/L versus a cyanide concentration of only 0.25 to 1 g/L. The higher concentration of thiosulphate required leads to higher reagent consumption, which is at least .

  • Gold dissolution in non-ammoniacal thiosulphate solutions: comparison of fundamentals and leaching studies 3 paper grit 4000 followed by rinsing with deionized water.

  • Gold thiosulfate leaching have the best prospects for industrial application; however, the effect of polythionate on this system is complicated. Effect of tetrathionate on thiosulfate leaching of gold in a copper–ammonia system over a prolonged period of time was studied in detail.

  • A fundamental study of the alkaline sulfide leaching of gold M.I. Jeffrey1* and C.G Anderson2 ... Although there has been little fundamental research into gold leaching in the alkaline sulfide system, ... standard potentials for the oxidation of gold to gold thiosulfate and gold sulfide are 0.15V and –0.46V respectively (Hiskey and Atluri ...


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