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gold leaching ammonium thiosulfate

  • Gold cyanidation

    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.

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  • Gold leaching by organic base polythionates new non toxic

    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. Then the

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  • THIO LEACHING Gold Refining Forum

    Sodium Thiosulfate will leach all of the salts of silver and gold and leave a colorless solution. Pgm salts will leave an orange to red solution. Ammonium Thiosulfate is an alternative to cyanide leaching. It will leach gold, generally at a higher redox rate than cyanide, but does not recover well on charcol. Most such systems use resin recovery.

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  • Thiosulfate leach Gold Refining Forum

    0.1M ammonium thiosulfate in 250cc water, how many grams of ammonium thiosulfate is this? moles of ammonium thiosulfate = M ( ammonium thiosulfate ) x volume of solution = 0.1M x 0.25 liter = 0.025 moles 0.025 moles x ( 148.21 g / moles ) = 3.7 grams of ammonium thisulfate needed to be added to 250 cc water.

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  • Ammonium thiosulfate

    Ammonium thiosulfate is also used for leaching of gold and silver. It works with presence of copper as a catalyst here. This process is a nontoxic alternative gold cyanidation.

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  • 1 Ammonium Thiosulfate Ecological Viable Alternative to

    Ammonium Thiosulfate Ecological Viable Alternative to Replace Sodium Cyanide in Gold and Silver Dissolution Ores 225 nitrate and oxalic acid, respectively, using phenolphthalein as an indicator in the case of CaO. To facilitate the process, the solutions were precipitated using zinc powder and lead acetate, melting the

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  • GOLD RECOVERY FROM PRINTED CIRCUIT BOARDS OF

    the leaching of gold from the PCBs is better. Thus, tests were performed with lower concentrations of thiosulfate and ammonium for the 4 hour leaching time and tests with higher concentrations of thiosulfate and ammonium for 24 hours. The sodium and ammonium thiosulfate were tested under different conditions of concentration, time, pH and

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  • Leaching of gold and silver from printed circuit board of

    The results for leaching gold with alternative reagents, sodium thiosulfate and ammonium hydroxide, show that the best extraction was achieved at 0.1M sodium thiosulfate and 0.2M ammonium hydroxide, when adding 0.1M of hydrogen peroxide as an oxidation agent, obtaining approximately 11% of gold.

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  • Leaching of Gold from the Waste Mobile Phone Printed

    56.7% gold was obtained under the optimum condition of 0.1M ammonium thiosulfate, 40 mM copper sulfate, pH 10 10.5, pulp density 10 g/L at room temperature and stirring speed of 250 rpm in 8h duration. The maximum leaching of gold in the pH range 10 10.5 may be attributed to the higher stability of the ammonium thiosulfate.

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  • Ammonium Thiosulfate Heap Leaching Technische

    A Novel Thiosulfate System for Leaching Gold Without the Use of Copper and Ammonia Ji, J. / Fleming, C. / West Sells, P. G. / Hackl, R. P. / TMS 2003 print version

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  • Using Nickel as a Catalyst in Ammonium Thiosulfate

    There has been extensive research on thiosulfate leaching for gold extraction since the 1970s.2931,3441) Ammonium thiosulfate leaching process is also applicable for the heap leaching process.28,31) However, there are problems in commercializing the thiosulfate process in the gold milling industry, the problems are the most notably high

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  • Thiosulphate Dropped Testing for PM? Page 2 Gold

    (If leaching gold with this thiosulfate leach, and maintaining leach in favorable conditions was like trying to juggle a basket full of rotten tomatoes while standing on your head, then trying to leaching gold from copper metal pins may just upset your balance and you can make something similar to Cambells toe mater soup).

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  • Effect of additives on thiosulfate leaching of a gold ore

    speed of 250 r/min, 100% leach recovery of gold was achieved with 0.03 M fresh ammonium thiosulfate, 2 mM EDTA after 11 h leach. In a resin in leach system, full gold recovery was also achievable with sufficient resin after 24 h leach with 0.06 M fresh ammonium thiosulfate and 2 mM EDTA at an agitation speed of 250 r/min.

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  • Gold Cementation from Ammonium Thiosulfate Solution

    Keywords gold, zinc, copper, aluminium, thiosulfate, cementation 1. Introduction Ammonium thiosulfate leaching is an alternative gold ex traction method to cyanidation because of its low toxicity.17) However, the gold recovery method from the leach solution was not widely studied. In our study of gold leaching,8) an

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  • Sodium Thiosulphate Gold Leaching

    Thiosulphate as an Alternative to Cyanide for Gold Processing HYPOCHLORITE LEACHING OF GOLD ORE TREATMENT OF A COPPER RICH GOLD ORE BY AMMONIA ASSISTED CYANIDE LEACHING Electrochemistry and Mechanism of Leaching Gold with Ammoniacal Thiosulphate Recovery Of Gold And Silver From Oxidation Leach Residues By Ammoniacal Thiosulphate Leaching

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  • THIOSULPHATE LEACHING AN ALTERNATIVE TO

    leaching process is more complex and less robust than the cyanide leaching process, and is therefore more difficult to optimize and more sensitive to operate. The leach process involves a chemical reaction between metallic gold and the thiosulphate anion, with oxygen as the oxidant, and ammonium

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  • The study of the kinetics of gold leaching in the ammonium

    The gold leaching rate in ammonium thiosulfate in the presence of copper species is mainly controlled by the cathodic process, which is under diffusion or mixed kinetics control. The results of the rotating gold disk leaching study are consistent with those from the electrochemical study.

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  • Thermodynamic analysis of the copper (I) homogeneous and

    Sep 09, 20190183;32;Thermodynamic analysis of the copper (I) homogeneous and heterogeneous speciation in ammonium thiosulfate leaching systems. Igor Povar, a Stefano Ubaldini, b Oxana Spinu, a Tudor Lupascu a. a Institute of Chemistry, 3 Academiei str., Chisinau, MD2028, Republic of Moldova.

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  • US6632264B2 Gold recovery from thiosulfate leaching

    Processes for recovering gold from copper gold ores thiosulfate leaching or gold ores copper catalyzed thiosulfate leaching using ion exchange technology are disclosed. The processes include subjecting the gold bearing and copper bearing thiosulfate solution to a pH and/or temperature adjustment to reduce tetrathionate concentration in the thiosulfate solution prior to contacting with an

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  • 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). It was suggested that gold leaching in the absence of Cu2+ ions, with an external current acting as a oxidizer, is not possible

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  • Ammonium Thiosulfate The Chemical Company

    Ammonium thiosulfate is a white crystalline solid inorganic compound with the chemical formula H8N2O3S2, and CAS 7783 18 8. The slightly toxic compound is used in photography, leaching of gold and silver, and as a fertilizer.

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  • The treatment of coppergold ores by ammonium thiosulfate

    The average gold recovery for thiosulfate heap leach at a particle size of minus 1.9 cm was found to be approximately 55%. Ammonium thiosulfate consumption was about 5 kg/ton for low sulfide carbonaceous ores (without biooxidation) and 1215 kg/ton for biooxidised ores.

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  • 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

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  • Gold leaching by organic base polythionates new non toxic

    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. Then the

    Live Chat
  • GOLD RECOVERY FROM PRINTED CIRCUIT BOARDS OF

    the leaching of gold from the PCBs is better. Thus, tests were performed with lower concentrations of thiosulfate and ammonium for the 4 hour leaching time and tests with higher concentrations of thiosulfate and ammonium for 24 hours. The sodium and ammonium thiosulfate were tested under different conditions of concentration, time, pH and

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  • Leaching of gold and silver from printed circuit board of

    Leaching of PCB's with sodium thiosulfate and ammonium thiosulfate. In this step, sodium and ammonium thiosulfate were used to extract gold and silver of whole PCBs. In both leachates, the effect of adding copper, as a catalyst agent, and hydrogen peroxide, as the oxidizing agent to

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  • DISSOLUTION OF GOLD WITH CYANIDE REPLACING REAGENTS

    queries. The aim of this paper is to study leaching of gold with cyanide replacing alternatives such as ammonium thiosulfate, chloride hypochlorite, thiourea and thiocyanate to provide new cases for the tool. The behaviour of gold was examined with electrochemical

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  • Thiosulfate leaching of gold A review ResearchGate

    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

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  • Ammonium Thiosulfate Heap Leaching Technische

    A Novel Thiosulfate System for Leaching Gold Without the Use of Copper and Ammonia Ji, J. / Fleming, C. / West Sells, P. G. / Hackl, R. P. / TMS 2003 print version

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  • Fundamental aspects of gold leaching in thiosulfate

    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.

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  • Thiosulphate Dropped Testing for PM? Page 2 Gold

    During leaching ferric oxide, Iron hydroxide and elemental sulfur will be in solids and copper in solution acting as oxidizer (oxygen rejuvenating the cupric Ion) and gold will be left with the thiosulfate IF this leach is working and IF all conditions are maintained in solution, (lt; 9 pH, and temperature also seem to be factors).

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  • (PDF) Review Gold leaching by copper(II) in ammoniacal

    Review Gold leaching by copper(II) in ammoniacal thiosulphate solutions in the presence of additives. Part I A review of the effect of hardsoft and Lewis acid

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  • Leaching gold by reactive flow of ammonium thiosulfate

    Here, we present a study of gold leaching, where the gold layer is removed from a microchannel wall within a high aspect ratio channel (8 m 215; 4 mm cross section; 1500). The etchant is an aqueous solution of sodium thiosulfate, ammonium hydroxide, and copper sulfate.

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  • Leaching of Gold from the Waste Mobile Phone Printed

    The ammonium thiosulfate contents in the leach liquors were in agreement with the quantity of gold leached in the respective pH ranges. In this process the copper sulfate worked as a catalyst. The experiment conducted with complete PCBs scrap exhibited a maximum leaching of 78.8% gold at the above optimised condition.

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  • Ammonium thiosulfate

    Ammonium thiosulfate (ammonium thiosulphate in British English) is an inorganic compound with the formula (NH 4) 2 S 2 O 3. It is white crystalline solid with ammonia odor, readily soluble in water, slightly soluble in acetone and insoluble in ethanol and diethyl ether.

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  • Thiosulphate Leaching Mining SGS

    Thiosulfate leaching is particularly well suited to state of the art resin in pulp (RIP) gold recovery technologies Thiosulfate leaching is an alkaline process (usually operated in the pH 8 to 10 range) so there are no concerns with corrosion of equipment in the recovery operation; The main chemical components of the thiosulfate leaching process (ammonium thiosulfate and ammonium sulphate

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  • Thiosulfate leaching of goldA review ScienceDirect

    Berezowsky and Sefton (1979) revived interest in thiosulfate leaching by developing an atmospheric ammoniacal thiosulfate leach process to recover gold and silver from residues of the ammonia oxidation leaching of sulfide copper concentrates More recent work has concentrated on understanding and improving the atmospheric ammoniacal thiosulfate leach process.

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  • Gold Leaching by Using Ammonium Thiosulfate Solution

    Request PDF on ResearchGate Gold Leaching by Using Ammonium Thiosulfate Solution The sponge gold (99.92 % pure) has been leached with ammonium thiosulfate solution. In this investigation, the

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