thiosulfate leaching of gold

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  • Gold strike with thiosulphate MINING

    Within the tanks, the slurry interacts with thiosulfate and a fine, bead like material called resin that collects the gold.

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  • GOLD LECHING FROM A SAUDI ORE BY THE NONPOLLUTING

    leaching in the ammoniacal thiosulfate solution. Gold leaching drastically decreased as the concentration of copper(II) increased 0.2 mM due to the degradation of S 2 O 3 2 . Keywords gold, extraction, leaching, thiosulfate, Saudi ore Introduction Gold dissolution in an alkaline cyanide solution was first reported by Elsner in 1846.

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  • Leach Gold using Hyposulphite Of Sodium AKA Thiosulfate

    Thiosulfate Gold Extraction The fact that gold will dissolve in sodium hyposulphite solutions is known from the lixiviation of silver and gold ores. The gold will dissolve only in small quantities.

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  • Thiosulfate leaching for gold hydrometallurgy

    Hydrometallurgy 39, 265 276 Thiosulphate leaching of precious metals has been developed as an alternative and non toxic technique to the conventional cyanidation.

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  • Treatment of a Polysulphide Ore by Ammoniacal Thiosulfate

    2.2 Ammoniacal Thiosulfate Leaching In all ammoniacal thiosulfate leaching processes the solution was prepared and then stabilized at pH of 10.5 by adding aqueous ammonia. Sodium thiosulfate of 95% of purity was used and 20% of aqueous ammonia as well. Cupric ions were introduced in form of copper sulfate pentahydrate.

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  • Thiosulfate leaching for gold hydrometallurgy

    Thiosulphate leaching of precious metals has been developed as an alternative and non toxic technique to the conventional cyanidation. This process has advantages over cyanide in a decreased

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  • THIOSULPHATE LEACHING sgs

    THIOSULPHATE LEACHING AN ALTERNATIVE TO CYANIDATION IN GOLD PROCESSING ALTERNATIVES TO CYANIDE IN GOLD PROCESSING THIOSULPHATE LEACHING Thiosulphate leaching is a process that removes gold from gold bearing ores without the use of cyanide. Although not as aggressive a leaching agent as cyanide, thiosulphate offers several technological

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  • Associated Sulfide Minerals in Thiosulfate Leaching of

    The effects of some associated minerals on thiosulfate gold leaching were studied through thermodynamic analysis and leaching experiments on composite ore samples containing various minerals and a reference silicate gold ore. In the leaching test on the reference gold ore, about 93% of gold was extracted within 3.0 hours.

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  • Thiosulfate leaching of goldA review ScienceDirect

    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 gold recoveries can be obtained from the thiosulfate leaching of complex and carbonaceous type ores.

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  • Ammoniacal thiosulfate and sodium cyanide leaching of preg

    gold leached from the carbonaceous matter to its initial gold content. Ammoniacal thiosulfate leaching of carbonaceous matter from autoclaved Goldstrike ore resulted in 90100% solubilization of the gold initially present regardless of the preg robbing behavior of the parent ore.

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  • Copper catalyzed thiosulfate leaching of low grade gold ores.

    Copper catalyzed thiosulfate leaching is being investigated by the U.S. Bureau of Mines as a potentially economical and environmentally safe method for heap leaching or in situ leaching of low grade oxidized gold ores.

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  • US6632264B2 Gold recovery from thiosulfate leaching

    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.

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  • what is gold leaching raha2016

    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

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  • effect of copper in gold leachin perkinspreschool

    Apr 05, 20180183;32;Gold leaching in thiosulfate solutions and its environmental effects . Gold leaching in thiosulfate solutions and its environmental effects compared with evaluating gold, copper, and mercury recovery from ion exchange resins.

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  • thiosulfate leach of gold plate YouTube

    Feb 24, 20140183;32;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

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  • US5536297A Gold recovery from refractory carbonaceous

    The gold from the gold thiosulfate complex formed during leaching is dissociated from the thiosulfate and associated with the cyanide to form a gold cyanide complex. Cyanide therefore replaces thiosulfate and, advantageously, the gold cyanide complex is readily adsorbed onto activated carbon or other suitable adsorbent.

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  • A Method for Leaching or Dissolving Gold from Ores or

    lurgical gold extraction routes utilize a leaching step to produce a gold bearing solution as an intermediate product while the recycling of secondary gold from electronic and precious metal scrap is based on the selective and fast dissolu tion of the precious metal. Therefore, A Method for Leaching or Dissolving Gold from Ores or Precious

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  • The role of ligands and oxidants in thiosulfate leaching

    Selected leaching results Unlike gold cyanidation, thiosulfate leaching involves relatively high concentrations of reagents, while the gold extraction is largely dependent on the presence or absence of various background reagents. The complexity of thiosulfate leaching of gold is exemplified in Figure 1 (14). It shows that sulfite,

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  • Sodium thiosulfate

    Ammonium thiosulfate is typically preferred to sodium thiosulfate for this application. Gold extraction. Sodium thiosulfate and ammonium thiosulfate area component of an alternative lixiviants to cyanide for extraction of gold. Thiosulfate forms strong soluble complexes with gold(I) ions, [Au(S 2 O 3) 2] 3.

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  • forward leaching of gold tcfuwhr

    Oct 28, 20180183;32;The ammoniacal thiosulfate leaching process for gold and silver extraction has been . F.A Forward, V.N MackiwAmmoniacal pressure oxidation leaching of. Contact Us. Role of hydrogen ions in standard and activation heap leaching of .

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  • Thiosulfate

    Thiosulfate is produced by the reaction of sulfite ion with elemental sulfur, and by incomplete oxidation of sulfides (pyrite oxidation), sodium thiosulfate can be formed by disproportionation of Sulfur dissolving in sodium hydroxide (similar to phosphorus).

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  • A Method for Leaching or Dissolving Gold from Ores or

    lurgical gold extraction routes utilize a leaching step to produce a gold bearing solution as an intermediate product while the recycling of secondary gold from electronic and precious metal scrap is based on the selective and fast dissolu tion of the precious metal. Therefore, A Method for Leaching or Dissolving Gold from Ores or Precious

    Get Price >>
  • Copper catalyzed thiosulfate leaching of low grade gold ores.

    Copper catalyzed thiosulfate leaching is being investigated by the U.S. Bureau of Mines as a potentially economical and environmentally safe method for heap leaching or in situ leaching of low grade oxidized gold ores.

    Get Price >>
  • Thiosulfate Leaching of Gold a Review Redox

    Efficient leaching is achieved by maintaining the appropriate concentrations of ammonia and thiosulfate in solution with copper (II) acting as oxidant. research is required on detailing the reactions and species involved in thiosulfate leaching of gold and silver in order to

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  • Solution chemistry factors for gold thiosulfate DeepDyve

    Solution chemistry factors for gold thiosulfate heap leaching Research and development of thiosulfate leach technology has been prompted by environmental concerns with the use of cyanide and problems associated with the processing of difficult to treat ores.

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  • A Review of Ammoniacal Thiosulfate Leaching of Gold An

    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.

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  • Using Nickel as a Catalyst in Ammonium Thiosulfate

    thiosulfate leaching of gold, nickel ion was used instead of copper ions in the present investigation. Eects of oxygen, ammonia, copper and thiosulfate on both gold extraction and thiosulfateconsumptionwereinvestigatedusingthesameore studied on the conventional copper catalyzed system.52) The gold in the pregnant solution was cemented by zinc powder.

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  • what is gold leaching raha2016

    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

    Get Price >>
  • Sodium Thiosulphate Gold Leaching

    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

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  • Copper catalyzed thiosulfate leaching of low grade gold ores.

    Copper catalyzed thiosulfate leaching is being investigated by the U.S. Bureau of Mines as a potentially economical and environmentally safe method for heap leaching or in situ leaching of low grade oxidized gold ores.

    Get Price >>
  • thiosulfate leaching Gold Refining Forum

    May 19, 20110183;32;Has anyone here actually used thiosulfate for leaching gold ore,and had positive results,that can be repeatable as a real leaching process? Has anyone found a real working precipitation process to recover the gold,that works well,and is dependable? Also getting the gold out of the precipitates seems to be a real pain.

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  • sodium thiosulfate use for gold leaching Mineral

    Nov 06, 20170183;32;Gold CIP Production Line,gold cyanidation for mining potassium . china hot sale widly use competitive price of potassium cyanide raymond mill . Zhengzhou General Mining Machinery Co., .. High Quality Allergy Sodium Thiosulfate.

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  • Leaching of Gold from the Waste Mobile Phone Printed

    Thiosulfate leaching to recover gold from ores is known for several decades but extensive researches have been started only for the past two decades. 4. The process of recovering gold from mobile phone PCBs is an innovative approach to obtain the precious metals. 18 Abhishek Tripathi

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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 ion exchange resin.

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  • Thiosulphate leaching of gold in the presence DeepDyve

    Thiosulphate leaching of gold in the presence of orthophosphate and polyphosphate Thiosulphate leaching of gold in the presence of orthophosphate and polyphosphate Feng, D.; van Deventer, J.S.J. 2011 02 01 000000 The effects of sodium orthophosphate and hexametaphosphate, were investigated in ammoniacal thiosulphate leaching of pure gold and a sulphide gold ore.

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  • Gold leaching by organic base polythionates new non toxic

    Gold leaching is the key stage in process of gold mining. There are a few well reputed leaching methods using a variety of different reagents. Nowadays the most popular industrial processes include cyanide, thiourea, and thiosulfate leaching methods.

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  • Thiosulfate Leaching as an Alternative to Cyanidation

    For ammonium thiosulfate leaching, the zinc precipitation stage will regenerate the thiosulfate for recycling back to leach circuit but about 40% of copper was co precipitated with gold and have to make up in the recycling leach solution.

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  • Thiosulfate leaching of gold A review Request PDF

    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.

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