fundamental of thiosulfate leach of gold

A fundamental study of gold leaching in a thiosulfate Leaching tests using gold powder showed that the gold dissolution in a thiosulfate‑oxygen‑copper system i fundamental of thiosulfate leach of gold

fundamental of thiosulfate leach of gold

  • A fundamental study of gold leaching in a thiosulfate

    Leaching tests using gold powder showed that the gold dissolution in a thiosulfate‑oxygen‑copper system in the absence of activated carbon was very slow, with only 2% gold dissolved over 24 h In contrast, in the presence of activated carbon as an additive the gold leach recovery was dramatically improved to over 95% in the same periodHowever, relatively slow gold leach kinetics has been a major obstacle for commercial uptake of this nonammoniacal thiosulfate leach systems (except for Barrick Goldstrike operation which is a unique case) Based on the findings of this research, the gold leach kinetics could be significantly improved by the use of activated carbonA fundamental study of gold leaching in a thiosulfateA fundamental electrochemical study of gold and gold/silver alloys in thiosulfate solutions showed that although the oxidation is a complex process, there was no selective dissolution of eitherA fundamental study of gold leaching in a thiosulfate

  • FUNDAMENTAL ASPECTS OF GOLD LEACHING IN

    thiosulfate leaching of gold (Jiang et al, 1993a) 38 Figure 225 Mechanism of gold leaching in ATS system in the presence of copper ion (Ouyang, 2001) 42 Figure 226 The electrochemical model for the copper catalysis mechanism of leaching gold with ammoniacal thiosulfate( Aylmore et al, 2001a) 43Fundamental aspects of gold leaching in thiosulfate solutions Li, Cheng Abstract The kinetics and mechanism of gold leaching in the ammoniathiosulfatecopper (ATSCu) system have been studied using the rotating electrochemical quartz crystal microbalance (REQCM)Fundamental aspects of gold leaching in thiosulfateThiosulfate leaching of roasted concentrate resulted in 98% gold and 93% silver recovery after 48 hoursUnder the conditions used in this study, reagent consumption was high ranging from 36 to 70Fundamental aspects of gold leaching in thiosulfate

  • THIOSULPHATE LEACHING – AN ALTERNATIVE TO

    The gold thiosulphate complex is very poorly adsorbed by activated carbon, negating the use of the traditional carbonin pulp (CIP) or carboninleach (CIL) processes for the recovery of gold directly from leach pulps Instead, SGS will evaluate the following gold recovery options for your project: • Resininpulp technology involvingALTA 2013 Gold Conference, Perth, WA, Australia, 25 May 1 June 2013 Pages: 9p Abstract: The research into leaching of gold with thiosulfate as an alternative lixiviant to cyanide has predominantly involved the use of copper in the presence of ammonia which serves as the oxidantFactors affecting gold leaching in thiosulfateO2 solutionsIncreasing environmental and occupational safety concerns about the use of cyanide in gold processing has increased interest in more acceptable alternative lixiviants, the most promising of which is thiosulfate However, the thiosulfate process lacks a proven inpulp method of recovering the dissolved gold because activated carbon is not effective for the absorption of the goldthiosulfateRecovering gold from thiosulfate leach pulps via ion

  • A fundamental study of the alkaline sulfide leaching of

    where r is the leaching rate (mol/m2s), M is the atomic mass of gold (19697g/mol), A is the area of the gold electrode (m2), and t is the time elapsed (s) Thus, the slope of the kinetic plot is a measure of the leaching rate It can be seen from Figure 1 that the gold/silver leach rate increases as aFundamental aspects of gold leaching in thiosulfate solutions Authors Cheng Li; Publication date January 1, 2003 Publisher University of British Columbia Abstract The kinetics and mechanism of gold leaching in the ammoniathiosulfatecopper (ATSCu) system have been studied using the rotating electrochemical quartz crystal microbalanceFundamental aspects of gold leaching in thiosulfateThe gold thiosulphate complex is very poorly adsorbed by activated carbon, negating the use of the traditional carbonin pulp (CIP) or carboninleach (CIL) processes for the recovery of gold directly from leach pulps Instead, SGS will evaluate the following gold recovery options for your project: • Resininpulp technology involvingTHIOSULPHATE LEACHING – AN ALTERNATIVE TO

  • An Electrochemical Study of the Dissolution of Pure Gold

    A fundamental electrochemical study of gold and gold/silver alloys in thiosulfate solutions showed that although the oxidation is a complex process, there was no selective dissolution of eitherThiosulfate leaching is a promising alternative to cyanidation, and the main hindrances for its wide commercial application are the high thiosulfate consumption and the difficult recovery of dissolved gold In this review, the four solutions to reduce the consumption of thiosulfate, including the control of reaction conditions, the use of additives, the generation of thiosulfate in situ, andA Review of Thiosulfate Leaching of Gold: Focus onALTA 2013 Gold Conference, Perth, WA, Australia, 25 May 1 June 2013 Pages: 9p Abstract: The research into leaching of gold with thiosulfate as an alternative lixiviant to cyanide has predominantly involved the use of copper in the presence of ammonia which serves as the oxidantFactors affecting gold leaching in thiosulfateO2 solutions

  • THE INCREASED ACTIVITY IN THE DEVELOPMENT OF

    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 impact of sulfide minerals There has also been a number of thiosulfate leach systems investigated which are characterised by the oxidant system usedSodium thiosulfate for smallscale gold leaching from I recently read that sodium thiosulfate can be used for gold and silver leaching in much a thiosulfate solution to leach out the gold, an ammonium salt for Inquire Now; Thiosulfate leaching of goldA review ScienceDirectammonium thiosulfate leaching gold jcc2019clwhere r is the leaching rate (mol/m2s), M is the atomic mass of gold (19697g/mol), A is the area of the gold electrode (m2), and t is the time elapsed (s) Thus, the slope of the kinetic plot is a measure of the leaching rate It can be seen from Figure 1 that the gold/silver leach rate increases as aA fundamental study of the alkaline sulfide leaching of

  • THE DISSOLUTION OF GOLD COLLOIDS IN AQUEOUS

    gold, thiosulfate ions and the mixed complex Cu(NH 3) p(S 2O 3) 0 The half order reactions support electrochemical mechanisms in some cases The initial dissolution rates of gold colloid, massive gold and goldsilver alloys by oxygenated copper(II) solutions also suggest agold loss due to dissipation, the need for a variety of time consumptive processing steps until precious metals can be recovered [12, 13] Although cyanide is the established gold recovery process, there are many reagents which are also capable to form soluble gold complexes But only thiosulfate, thiourea, halide, thiocyanate and sulfideCyanide alternative leaching reagents for gold recoveryFundamental aspects of gold leaching in thiosulfate solutions Authors Cheng Li; Publication date January 1, 2003 Publisher University of British Columbia Abstract The kinetics and mechanism of gold leaching in the ammoniathiosulfatecopper (ATSCu) system have been studied using the rotating electrochemical quartz crystal microbalanceFundamental aspects of gold leaching in thiosulfate

  • Factors affecting gold leaching in thiosulfateO2 solutions

    ALTA 2013 Gold Conference, Perth, WA, Australia, 25 May 1 June 2013 Pages: 9p Abstract: The research into leaching of gold with thiosulfate as an alternative lixiviant to cyanide has predominantly involved the use of copper in the presence of ammonia which serves as the oxidantGold is thought to be brought into solution in the form of a gold thiosulfate complex according to the following reaction: 4Au+8S 2 O 3 2− +O 2 +2H 2 O→4Au(S 2 O 3) 2 3− +4OH − The thiosulfate leach may involve the addition of ammonia, as the ammonium thiosulfate salt, and copper, usually as the pentahydrated cupric sulfate salt, asGold recovery from thiosulfate leaching The UniversityEffect of additives on thiosulfate leaching of a gold ore In a resininleach system, full gold recovery was also achievable with sufficient resin after 24 h leach with 006 M fresh ammonium thiosulfate and 2 mM EDTA at an agitation speed of 250 r/min Key words: Gold leaching, Thiosulfate, Additives, Leaching kinetics, Thiosulfate stabilityhow to use sodium thiosulfate to leach gold

  • USB2 Gold recovery from thiosulfate leaching

    Processes for recovering gold from coppergold ores thiosulfate leaching or gold ores copper catalyzed thiosulfate leaching using ion exchange technology are disclosed The processes include subjecting the goldbearing and copperbearing thiosulfate solution to a pH and/or temperature adjustment to reduce tetrathionate concentration in the thiosulfate solution prior to contacting with an ionAn improved thiosulphate leach process for the recovery of gold from ores and other goldbearing 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 recoveredWOA1 Improved thiosulphate leach processThe gold recovery from oxygen pressure thiosulfate leach solution was conducted by the method of resin adsorption Over 98% of gold can be loaded at 1 g/L strong base anion exchange resin of Tulsion A21S and almost 100% of gold on the loaded resin can be stripped with a two component eluent solution comprising chloride and sulfiteStudy on oxygen pressure thiosulfate leaching of gold

  • thiosulfate leaching Gold Refining Forum

    out if Thiosulfate is a viable process for extracting gold I would like to hear the facts,from someone that has used it in a real mining situationBits and pieces of information are what is dangerous with any process I have edited this to include some information that may help the forum members in the future, and one in particularWhat is claimed is: 1 A process for recovering a precious metal from a precious metalcontaining material, comprising: (a) contacting the precious metalcontaining material with a thiosulfate lixiviant at superatmospheric pressure in the substantial or complete absence of added ammonia to solubilize the precious metal and form a pregnant thiosulfate leach solution containing the solubilizedMethod for thiosulfate leaching of precious metalIncreasing environmental and occupational safety concerns about the use of cyanide in gold processing has increased interest in more acceptable alternative lixiviants, the most promising of which is thiosulfate However, the thiosulfate process lacks a proven inpulp method of recovering the dissolved gold because activated carbon is not effective for the absorption of the goldthiosulfate complexRecovering gold from thiosulfate leach pulps via ion