elemental gold from gold 1 thiosulfate complexes

The Deposition of Elemental Gold from Gold(I)Thiosulfate 1/1/2007· Spherical gold particles (~1μm diam) were precipitated in the abiotic experiments,

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elemental gold from gold 1 thiosulfate complexes

  • The Deposition of Elemental Gold from Gold(I)Thiosulfate

    1/1/2007· Spherical gold particles (~1μm diam) were precipitated in the abiotic experiments, and the formation of octahedral gold, framboidlike structures and gold foils were not observed in these experiments The reduction and enrichment of elemental gold by sulfatereducing bacteria occurred without the concomitant death of the bacteria, suggesting that in natural systems, this1/1/2007· The role of sulfatereducing bacteria in the precipitation of elemental gold through a geologic stratum was investigated using column experiments The mixed culture, dominated by sulfatereducing bacteria, was isolated from the Driefontein consolidated gold mine, Witwatersrand basin, Republic of South Africa Bacterially mediated gold precipitation fromThe deposition of elemental gold from gold(I)thiosulfateModern SRB, eg, Desulfovibrio spp, are able to reduce the thiosulfate from mobile gold thiosulfate complexes; this destabilizes gold in solution, which may then beThe Deposition of Elemental Gold from Gold(I)Thiosulfate

  • Concentration of Gold(I) Thiosulfate Complex Ions on the

    (iii) reduction of the gold(I) complex ions to elemental gold (electrum) From the viewpoint of high solubility of gold in oreforming fl uid near neutral conditions, many investigations have been performed for the dissolution of elemental gold in aqueous solution in the presence of hydrogen sulfi de at a high temperature Special Issue Article Concentration of Gold(I)South Africa, was able to destabilize gold(I)thiosulfate complex ðAuðS 2O 3Þ 2 3 Þ and precipitate elemental gold The precipitation of gold was observed in the presence of active (live) SRB due to the formation and release of hydrogen sulfide as an endproduct of metabolism, and occurred by three possible mechanisms involving iron sulfide, localized reducing conditions,Bioaccumulation of gold by sulfatereducing bacteriaThe results of the insitu reduction showed that the goldthiosulfate complex([Au(S 2 O 3) 2] 3−) can be reduced to elemental gold particles with a particle size of 130–320 nm The origin of the insitu reduction of gold might be derived from the photo generated electrons released by molybdenum disulfide The 1866762 mg∙g −1 recovery capacity of gold on molybdenumInsitu reduction of gold thiosulfate complex on

  • The effect of thiosulfateoxidizing bacteria on the

    When thiosulfate, elemental sulfur, Gold colloids may exist in cells in the presence of the goldthiosulfate complex breaking down to Au + and269 Application of Resins to Recover the Gold Thiosulfate Complex 76 2691 StrongBase Resins 76 2692 WeakBase Resins 76 viii 2610 Summary of Published Work on Recovering Gold from Thiosulfate Solutions and Pulps 78 2611 Elution of Metal Complexes from Anion Exchange Resins 81Recovery of Gold from Thiosulfate Solutions and Pulps withThe results of the insitu reduction showed that the goldthiosulfate complex([Au(S2O3)2]3−) can be reduced to elemental gold particles with a particle size of 130–320 nm The origin of the insitu reduction of gold might be derived from the photo generated electrons released by molybdenum disulfide The 1866762 mg∙g−1 recovery capacity of gold on molybdenumInsitu reduction of gold thiosulfate complex on

  • (PDF) The effect of thiosulfateoxidizing bacteria on the

    The possibility of chloride to form a complex with mM gold and precipitated gold from these solutions (Tables Au⫹ and to compete with thiosulfate was unlikely because AuCl⫺ 2 1–3 and Figs 2 and 3), while under abiotic systems at pH 57 is only stable under oxidizing condition at an approximate Eh of and 19 and in the presence of dead bacteria, the precipitation 1002 VThe gold(I) thiosulfate complex Na 3 [Au(S 2 O 3) 2]·2H 2 O has been studied in the gas phase by ESI MS, which showed the aggregate ion [Na 2 Au(S 2 O 3) 2] − (m/z 46678) at moderate capillary exit voltages, while at high capillary exit voltage (240 V) the major ion is the auride anion, Au −, (m/z 19696), together with [AuS] − (m/z 22893) at low relative intensityAn investigation of gold(I) and silver(I) thiosulfateThe results of the insitu reduction showed that the goldthiosulfate complex([Au(S2O3)2]3−) can be reduced to elemental gold particles with a particle size of 130–320 nm The origin of the insitu reduction of gold might be derived from the photo generated electrons released by molybdenum disulfide The 1866762 mg∙g−1 recovery capacity of gold on molybdenumInsitu reduction of gold thiosulfate complex on

  • Concentration of Gold(I) Thiosulfate Complex Ions on the

    The solubilities, measured as total dissolved gold, were in the range 36 × 10−8 to 665 × 10−4 mol kg−1 (0007–131 mg kg−1), in solutions of total reduced sulphur between 00164 and 0The possibility of chloride to form a complex with mM gold and precipitated gold from these solutions (Tables Au⫹ and to compete with thiosulfate was unlikely because AuCl⫺ 2 1–3 and Figs 2 and 3), while under abiotic systems at pH 57 is only stable under oxidizing condition at an approximate Eh of and 19 and in the presence of dead bacteria, the precipitation 1002 V(PDF) The effect of thiosulfateoxidizing bacteria on theThe gold dissolution rate of the gold ore could reach 943% and the thiosulphate consumption could be reduced to 112 kg/t ore in the thiosulphate gold leaching system containing 01 mol/L of sodium thiosulphate, 006 M ethanediamine, 0005 M copper ion and 15 kg/t of CTAB and operated at a rate of agitation of 150 rpmThiosulfate leaching of gold—A review ScienceDirect

  • The effect of thiosulfateoxidizing bacteria on the

    An Acidithiobacillus thiooxidans spp, isolated from the Driefontein Consolidated Gold Mine, Witwatersrand Basin, Republic of South Africa was able to precipitate gold from Au(S 2 O 3 ) 2 3 in the presence of up to 026 mM gold In chemical control experiments and with the presence of dead bacteria, gold was not precipitated under similar experimental conditions and durationIn addition, although the gold (Ι) thiosulfate complex is the only desired anion for adsorption, a considerable number of unwanted anions, including copper (Ι) thiosulfate complexes, sulfuroxygen anions and other metal thiosulfate complexes in the solutions, can be adsorbed causing the dramatic decrease of gold loading and thus the significant increase of the resin dosageRecovery of Gold from Pregnant Thiosulfate Solutions byThe regeneration of strongbase anion exchanger AV176 1 liter after elution of the complex thiosulfategold solution polythionate carried out by washing with 6 l of 1% solution of a mixture of sulfite and sodium sulfideammonium at a rate of 1 l/h, pH 46 1 The method of obtaining gold from goldbearing sulfide crushed ore after openingMethod of gold extraction from sulphide goldbearing ores

  • Separation of Ag and Cu from Their Aqueous Thiosulfate

    8/10/2019· Thiosulfate leaching technology has been successfully applied on precious metal extraction [1,2], and has gradually become a substitute to cyanidation leaching due to its lower toxicityFeng [] studied gold leaching in a more comprehensive way with calcium, sodium, and ammonium thiosulfate salts from pure gold, gold ores, and sulphide oreIt indicated that in12/8/2017· The presence of elemental gold on the surface of adsorbents suggests some reduction mechanism accompanying the adsorption of goldthiourea complex The proposed mechanism of adsorption of goldthiourea complex consists of an ion exchange between the cationic gold complex and the positive functional groups on the resin This adsorbed goldThiourea Gold Leaching Metallurgist & Mineral ProcessingGold 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, as catalysts This process is forGold recovery from thiosulfate leaching The University

  • Separation of Ag and Cu from Their Aqueous Thiosulfate

    8/10/2019· Thiosulfate leaching technology has been successfully applied on precious metal extraction [1,2], and has gradually become a substitute to cyanidation leaching due to its lower toxicityFeng [] studied gold leaching in a more comprehensive way with calcium, sodium, and ammonium thiosulfate salts from pure gold, gold ores, and sulphide oreIt indicated that inIn addition, although the gold (Ι) thiosulfate complex is the only desired anion for adsorption, a considerable number of unwanted anions, including copper (Ι) thiosulfate complexes, sulfuroxygen anions and other metal thiosulfate complexes in the solutions, can be adsorbed causing the dramatic decrease of gold loading and thus the significant increase of the resin dosageRecovery of Gold from Pregnant Thiosulfate Solutions by10/11/2006· PCT application WO 91/11539 discloses recovering gold from a goldloaded thiosulfate solution by adding cyanide to form a gold cyanide complex followed by adsorbing the gold cyanide complex onto a carbon or resin adsorbent Thomas et al, US Pat Nos 5,536,297 and 5,785,736, disclose a process for treating a refractory sulfidic and carbonaceous ore byTHIOSULFATE GENERATION IN SITU IN PRECIOUS METAL RECOVERY

  • Thiourea Gold Leaching Metallurgist & Mineral Processing

    12/8/2017· The presence of elemental gold on the surface of adsorbents suggests some reduction mechanism accompanying the adsorption of goldthiourea complex The proposed mechanism of adsorption of goldthiourea complex consists of an ion exchange between the cationic gold complex and the positive functional groups on the resin This adsorbed goldThe regeneration of strongbase anion exchanger AV176 1 liter after elution of the complex thiosulfategold solution polythionate carried out by washing with 6 l of 1% solution of a mixture of sulfite and sodium sulfideammonium at a rate of 1 l/h, pH 46 1 The method of obtaining gold from goldbearing sulfide crushed ore after openingMethod of gold extraction from sulphide goldbearing oresProcesses 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 priorUSB2 Gold recovery from thiosulfate leaching

  • Gold Oxidation States Mineral Processing & Metallurgy

    17/9/2015· With regards to the aqueous chemistry of gold and the various states of gold oxidation ( 5, 3, 2, 1, −1 (an amphoteric oxide)), we must look at the electronic presentation typical of transition metal elements (Copper, Silver, Gold) AKA Group 11 element from the periodic table, because they allow for the extraction of multi electrons As shown in the red circle ofEach thiosulfate ion contains 2 atoms of sulfur, and it is chiefly the presence of sulfur that necessitates the removal of the silver thiosulfate complexes which are the products of the fixation process Also, any thiosulfate which has not "complexed" with silver must be removed as well, because the thiosulfate ion is itself unstable and can be easily decomposed, thusChapter 9 The Albumen & Salted Paper BookStructurally, thiosulfate is similar to sulfate The molecule has a slightly distorted tetrahedral shape with a central and a peripheral sulfur (SSO 3)Sulfur is larger than oxygen and forms weaker bonds, so the SS bond is somewhat longer than the SO bonds (199 +/ 003 A vs 148 +/ 006 A, respectively) [] What are some common thiosulfate compounds?What is thiosulfate ion, and what is it used for?

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