Flowsheet Of Role Of Oxygen On Thiosulphate Leaching

  • COMPARISON OF CYANIDE AND THIOSULPHATE LEACHING FOR

    leach significant quantities of gold without consuming excessive quantities of reagents. Thiosulphate is a more effective lixiviant of preg-robbing and high-copper ores than cyanide because ammoniacal thiosulphate leaching is less sensitive than cyanidation to contamination by unwanted cations.

  • The role of oxygen in thiosulphate leaching of gold

    The role of oxygen in thiosulphate leaching of gold has been investigated in both pure gold and ore systems. The gold dissolution decreased in the presence of oxygen in the pure gold system.

  • 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.

  • The role of oxygen in thiosulphate leaching of gold

    The role of oxygen in thiosulphate leaching of gold has been investigated in both pure gold and ore systems. The gold dissolution decreased in the presence of oxygen in the pure gold system. Air or oxygen bubbling caused higher consumption of thiosulphate and leaching passivation. Nitrogen bubbling largely increased gold dissolution and this

  • Cited by: 23
  • The role of oxygen in thiosulphate leaching of gold

    The role of oxygen in thiosulphate leaching of gold has been investigated in both pure gold and ore systems. The gold dissolution decreased in the presence of oxygen in the pure gold system. Air or oxygen bubbling caused higher consumption of thiosulphate and leaching passivation. Nitrogen bubbling largely increased gold dissolution and this

  • Cited by: 23
  • THIOSULPHATE LEACHING AN ALTERNATIVE TO CYANIDATION

    thiosulphate leaching flowsheet is very similar to a conventional cyanide leach. SGS is a global technical leader in the field of thiosulphate leaching, and our laboratory and industry experts have spent years designing and developing the technique into a viable alternative to cyanide for some gold-bearing ores. SGS technical experts will work with you to ensure your flowsheet development is

  • Thiosulphate leaching: Recovery of gold from pregnant

    In addition, the features and flowsheet of the first and unique commercial/industrial application of thiosulphate leaching process (resin in leach (ion exchange) + electro-winning) developed by

  • Recent Advances in the Development of an Alternative to

    A process based on thiosulphate leaching, followed by resin-in-pulp gold extraction, has been developed to treat . the carbonaceous, preg-robbing ores of Barrick’s Goldstrike orebody in the Carlin Trend of Nevada, USA. These ores have proven to be amenable to thiosulphate leaching, under mild conditions; gold leaches rapidly as the gold

  • Role of oxygen and ammonium ions in silver leaching with

    6/08/2013· Leaching silver with 4 mg·L −1 oxygen in the aqueous solution requires high concentration of ammonium and thiosulfate ions. High silver dissolution is achieved at pH of high cupric tetraamine concentration, around pH 9.8, but a high degradation of thiosulfate ions is resulted from their oxidation by the presence of oxygen.

  • Cited by: 4
  • The role of ligands and oxidants in thiosulfate leaching

    article reviews some leaching results and the current status with respect to important stoichiometric relationships of chemical reactions, speciation, as well as detailed mechanisms for anodic or chemical oxidation of gold in thiosulfate solutions. The role of ligands and oxidants in thiosulfate leaching of gold Gamini Senanayake

  • Cited by: 54
  • The role of ligands and oxidants in thiosulfate leaching

    article reviews some leaching results and the current status with respect to important stoichiometric relationships of chemical reactions, speciation, as well as detailed mechanisms for anodic or chemical oxidation of gold in thiosulfate solutions. The role of ligands and oxidants in thiosulfate leaching of gold Gamini Senanayake

  • THIOSULPHATE LEACHING FOR GOLD PRODUCTION JACOB

    7/06/2018· Copper(II) ion has an important role in the thiosulphate leaching of gold since it acts as an oxidant for gold and as a catalyst. Copper ions in solution can speed up the dissolution of gold by 20

  • The role of oxygen in thiosulphate leaching of gold The

    The role of oxygen in thiosulphate leaching of gold Journal Articles Refereed. Overview; Time; Identity; Additional Document Info; Overview Authors . Authorship. FENG D PROF Jan Stephanus Jakob van Deventer; Has subject area . For 2008 4 Digit Code. Resources Engineering and

  • (PDF) Role of oxygen and ammonium ions in silver leaching

    (2014) 33(2):225–229 Role of oxygen and ammonium ions in silver leaching with thiosulfate–ammonia–cupric ions 227 2Cu2þ þ 6S2 O2 3 2CuðS2 O3 Þ3 2 2 þ S4 O 6 ð1Þ 1 2S2 O2 2 3 þ H2 O þ O2 S4 O6 þ 2OH ð2Þ 2 Of the two foregoing chemical reactions, Eq. (2) gives rise to a pH increase. For the leaching tests in the absence of ammo

  • Role of copper(II), carbonate and sulphite in DeepDyve

    1/04/2005· Read "Role of copper(II), carbonate and sulphite in gold leaching and thiosulphate degradation by oxygenated alkaline non-ammoniacal solutions, Minerals Engineering" on DeepDyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips.

  • Published in: Minerals Engineering · 2005Authors: G SenanayakeAffiliation: Cooperative Research CentreAbout: Chemical kinetics · Leaching · Thermodynamics · Hydrometallurgy · Copper · Redox
  • Thiosulfate Wikipedia

    Thiosulfate (S 2 O 2− 3) (IUPAC-recommended spelling; sometimes thiosulphate in British English) is an oxyanion of sulfur.. The prefix thio-indicates that the thiosulfate ion is a sulfate ion with one oxygen replaced by sulfur.Thiosulfate has a tetrahedral molecular shape with C 3v symmetry. Thiosulfate occurs naturally and is produced by certain biochemical processes.

  • 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 ion

  • Extractive Metallurgy: Extraction Process of Gold (Au) and

    Leaching There are many theory of the gold leaching: Elsner’s Oxygen Theory, Janin’s Hydrogen Theory, Bodlanders’s Hydrogen Peroxide Theory, Boonstra’s Corrosion Theory, until Kinetic proving Theory by Habashi. Elsner’s Oxygen Theory is The most of theory that used, reaction of gold and silver leaching:

  • THE INCREASED ACTIVITY IN THE DEVELOPMENT OF

    THE INCREASED ACTIVITY IN THE DEVELOPMENT OF THIOSULFATE BASED PROCESSES FOR GOLD RECOVERY By Paul Breuer, Xianwen Dai, Hongguang Zhang & Danielle Hewitt CSIRO Minerals Down Under National Research Flagship, Australia Presenter and Corresponding Author Paul Breuer [email protected] ABSTRACT Thiosulfate has been researched as an alternative lixiviant to

  • Adsorption of Copper from an Ammonia-Thiosulfate Media

    The study of copper adsorption onto ion exchange resins of anionic type is part of the gold recovery from ammonia-thiosulfate solutions, where copper is the main impurity of the system because it acts as a catalyst of gold dissolution reaction. A study is made of the adsorption and desorption of copper in the form of the complex in an ammonia-thiosulfate media on an ion exchange resin, DOWEX

  • Thiosulfate Wikipedia

    Thiosulfate (S 2 O 2− 3) (IUPAC-recommended spelling; sometimes thiosulphate in British English) is an oxyanion of sulfur.. The prefix thio-indicates that the thiosulfate ion is a sulfate ion with one oxygen replaced by sulfur.Thiosulfate has a tetrahedral molecular shape with C 3v symmetry. Thiosulfate occurs naturally and is produced by certain biochemical processes.

  • Adsorption of Copper from an Ammonia-Thiosulfate Media

    The study of copper adsorption onto ion exchange resins of anionic type is part of the gold recovery from ammonia-thiosulfate solutions, where copper is the main impurity of the system because it acts as a catalyst of gold dissolution reaction. A study is made of the adsorption and desorption of copper in the form of the complex in an ammonia-thiosulfate media on an ion exchange resin, DOWEX

  • Oxidative pre-treatment in thiosulphate leaching of

    19/02/2010· Read "Oxidative pre-treatment in thiosulphate leaching of sulphide gold ores, International Journal of Mineral Processing" on DeepDyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips.

  • Published in: International Journal of Mineral Processing · 2010Authors: D Feng · J S J Van DeventerAffiliation: University of MelbourneAbout: Partial oxidation · Ammonia · Kinetics
  • Role of Thiosulfate in the Corrosion of Steels: A Review

    Thiosulfate salts have been known to be dangerous corrosion promoters for over 30 y, when present under typical service conditions. This paper reviews the role of thiosulfate anion in causing localized corrosion and/or stress corrosion cracking of steels.

  • Role of Dissolved Oxygen Concentration on Gold Recovery

    Role of Dissolved Oxygen Concentration on Gold Recovery from Sulphide Ores via Cyanidation and Thiosulphate Leaching Processes Currently most gold mining operations apply air in their gold recovery process, but there are some data showing that the

  • Extraction of Copper at Elevated Feed Concentrations

    methods, for example, oxygen pressure leaching. Higher percent solids are employed in the leaching stages both to keep plant sizes as small as practically possible, and to ensure that the heating requirements of the process are being fully met by oxidising the available sulphur. This results in more concentrated leach liquors with higher metal

  • sketches & tables UNIGE

    In recent years thiourea and thiosulphate leaching gained a certain attractivity because it was believed that less toxic or non-toxic reagents are involved. An additional argument for thiourea or thiosulphate are their high leaching rates that can reach 250mg/cm2 per hour exceeding cyanides almost by a factor of 100. The technical

  • Cyanide Leaching Of Gold

    Oxygen plays an important role in the leaching of gold in a cyanide solution, also. It has been proven that the rate of dissolution of gold in cyanide solution is directly proportional to the amount of oxygen present. Normal water will have 8-9 ppm dissolved oxygen present in it. If this oxygen is used up by other reactions, it may be necessary

  • A COMBINED CHEMICAL AND BIOLOGICAL HEAP LEACHING

    A COMBINED CHEMICAL AND BIOLOGICAL HEAP LEACHING OF AN OXIDE GOLD-BEARING ORE A heap consisting of an oxide gold-bearing ore containing 3.5 g/t of gold and 14.0 g/t of silver was leached by solutions containing amino acids of microbial origin and thiosulphate as gold-

  • Published in: Physicochemical Problems of Mineral Processing · 1999Authors: Stoyan Groudev · Irena Spasova · I M Ivanov
  • Sodium thiosulfate Wikipedia

    Sodium thiosulfate (sodium thiosulphate) is an inorganic compound with the formula Na 2 S 2 O 3. x H 2 O. Typically it is available as the white or colorless pentahydrate, Na 2 S 2 O 3 ·5H 2 O. The solid is an efflorescent (loses water readily) crystalline substance that dissolves well in water. It is also often called sodium hyposulfite or hypo.

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