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Leaching Gold Ore Thiosulphate

A comparison of thiosulfate with cyanide leaching of gold from carbonaceous ore showed that thiosulfate is chemically better and economically more advantageous. Description. Online access for this thesis was created in part with support from the Institute of Museum and Library Services IMLS administered by the Nevada State Library Archives .

  • US6632264B2 Gold recovery from thiosulfate leaching US6632264B2 Gold recovery from thiosulfate leaching

    The invention also provides processes for recovering gold from copper-gold ores thiosulfate leaching or copper catalyzed gold ores thiosulfate leaching using ion exchange resin technology.

  • Using Thiosulphate as Gold Leaching Agent in a Using Thiosulphate as Gold Leaching Agent in a

    1 Using Thiosulphate as Gold Leaching Agent in a Brazilian Carbonaceous Ore Batch Tests Analysis Francisco Pedrosa1 Fernando Barros2 Arthur Chaves3 Eliana Mano3 and Dimas Neto3 1. Institute .

  • Gold strike with thiosulphate Gold strike with thiosulphate

    Jun 19 2015 Thiosulphate has long been seen as a potential alternative to cyanide for liberating gold from ores but until now it has proved difficult to master. Cyanide is highly toxic and an environmental .

  • Determination of the potential gold electrowinning from an Determination of the potential gold electrowinning from an

    Oct 05 2015 The use of electrochemical techniques in the selective recovery of gold from a solution containing thiosulphate ammonia and copper obtained from the leaching of printed circuit boards from mobile phones using ammoniacal thiosulphate are shown in this work.

  • PDF Thiosulphate leaching for gold hydrometallurgy PDF Thiosulphate leaching for gold hydrometallurgy

    The pH of the pulp ranged from 8.5 to 10.5.Adsorption studies were carried out with the actual ammoniacal thiosulphate solution coming from the leaching of the gold ore sample. The gold concentration of the solution was in the range from 2 mgl to 16.60 mg1 and the pH was 10.5.

  • Gold recovery from thiosulfate leaching The University Gold recovery from thiosulfate leaching The University

    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 gL copper and this copper may greatly accelerate the oxidation of thiosulfate.

  • Gold and silver extraction by ammoniacal thiosulfate Gold and silver extraction by ammoniacal thiosulfate

    title Gold and silver extraction by ammoniacal thiosulfate leaching from a rhyolite ore abstract An investigation has been carried out to identify the parameters of importance in the dissolution of gold and silver values from an ore using ammoniacal thiosulfate solutions containing copper.

  • Ammoniacal Thiosulphate Leaching of Gold Ore Ammoniacal Thiosulphate Leaching of Gold Ore

    Ammoniacal thiosulphate leaching of gold finds a better substitute as it is non-toxic and environmentally safe as compared to the toxic cyanide system for gold extraction. In the present study an attempt is made to assess the feasibility of ammoniacal thiosulphate leaching of gold ore

  • Biooxidation of goldbearing sulfide ore and subsequent Biooxidation of goldbearing sulfide ore and subsequent

    The gold and silver recovery rates by thiosulfate leaching were 64.0 and 57.3 respectively. Gold and silver recovery rates from unoxidized ore control experiment by cyanidation were 20.9 and 26.8 respectively. Thiosulfate leaching of unoxidized ore allowed the extraction of 38.8 and 24.2 of the gold and silver respectively.

  • Treatment of copperrich gold ore by cyanide leaching Treatment of copperrich gold ore by cyanide leaching

    sulphide minerals during cyanidation of gold 131416. Preleaching of ore can be undertaken to remove reactive copper minerals prior to cyanide leaching of gold. SCERESINI and STAUNTON 17 proposed the removal of copper by cyanide leaching without aeration prior to gold extraction and then adsorption of copper on activated carbon.

  • In place leaching of oxidized gold deposits A new In place leaching of oxidized gold deposits A new

    leaching of gold ores. This work also indicated that the presence of pyrite results in rapid catalysed oxidation of the sodium thiosulphate rendered the method ineffective in the absence of a method for passivating the pyrite prior to lixiviant introduction and throughout the leaching process. Therefore this research has focused on gold ore .

  • EXTRACTION OF GOLD AND SILVER FROM TURKISH GOLD ORE EXTRACTION OF GOLD AND SILVER FROM TURKISH GOLD ORE

    Nov 14 2007 Thiosulphate leaching of precious metals is one of the processes that were developed as an alternative and nontoxic technique to conventional cyanidation. The aim of this experimental study was to investigate the possibilities of leaching gold and silver in ammoniacal thiosulphate solutions on a laboratory scale.

  • Gold dissolution in nonammoniacal thiosulphate Gold dissolution in nonammoniacal thiosulphate

    alternative to cyanidation for treating some sulphidic gold ores. Keywords Thiosulphate gold oxidation leaching electrochemistry kinetics. Introduction Concern about the environmental impact of the widely used cyanidation technology has generated a lot of interest in searching for an alternative process for gold leaching over the past years.

  • Effect of additives on thiosulfate leaching of a gold ore Effect of additives on thiosulfate leaching of a gold ore

    S.J. Dai et al. Effect of additives on thiosulfate leaching of a gold ore 50 The leaching of sulfide minerals increased with the addition of EDTA as reflected by the increased sulfur concentration in solution. CMC slightly increased gold recovery at low concentration but hindered gold leaching at a high concentration. .

  • A study of thiosulfate leaching of gold from carbonaceous A study of thiosulfate leaching of gold from carbonaceous

    A comparison of thiosulfate with cyanide leaching of gold from carbonaceous ore showed that thiosulfate is chemically better and economically more advantageous. Description. Online access for this thesis was created in part with support from the Institute of Museum and Library Services IMLS administered by the Nevada State Library Archives .

  • Gold leaching in thiosulfate solutions and its Gold leaching in thiosulfate solutions and its

    Also it was found that in thiosulfate solutions containing thiourea the oxidation current of goldsilver alloys decreased and the oxidation current from pure gold after the standard potential for gold oxidation 150 mV is higher than the total oxidation current from gold-silver alloys.Leaching of a selected gold ore using thiosulfate .

  • Selective Electrochemical Gold Recovery from Leaching Selective Electrochemical Gold Recovery from Leaching

    May 03 2017 The electro-recovery of gold from thiosulfate leaching systems was evaluated on Pt electrode using S3 solution with a gold concentration of 0.0014 mol L −1 27.4 mg of dissolved gold. In Figure 5 the characteristic oxidation CuCuICuII and reduction CuIICuICu peaks discussed in the previous results are observed.

  • In place leaching of oxidized gold deposits A new In place leaching of oxidized gold deposits A new

    leaching of gold ores. This work also indicated that the presence of pyrite results in rapid catalysed oxidation of the sodium thiosulphate rendered the method ineffective in the absence of a method for passivating the pyrite prior to lixiviant introduction and throughout the leaching process. Therefore this research has focused on gold ore .

  • Cyanidefree gold recovery CSIRO Cyanidefree gold recovery CSIRO

    Feb 19 2021 Thiosulphate dissolves the fine gold out of ores the gold that has not recovered by gravity at similar rates to conventional techniques. Its safe and lowers environmental impacts. The method has undergone intensive testing in the laboratory to understand its leaching performance in association with reagent recovery and recycle.

  • Leaching of gold from a free milling gold ore in copper Leaching of gold from a free milling gold ore in copper

    The results of kinetic analysis of dissolution rate of gold indicate the leaching process gold from free milling ores may be controlled by the product layer diffusion under the experimental conditions with an activation energy of 34.48 kJmol. The copper-citrate-thiosulfate system has some advantages over cyanidation such as green nontoxic .

  • EXTRACTION OF GOLD AND SILVER FROM TURKISH GOLD ORE EXTRACTION OF GOLD AND SILVER FROM TURKISH GOLD ORE

    Nov 14 2007 Thiosulphate leaching of precious metals is one of the processes that were developed as an alternative and nontoxic technique to conventional cyanidation. The aim of this experimental study was to investigate the possibilities of leaching gold and silver in ammoniacal thiosulphate solutions on a laboratory scale.

  • A study of thiosulfate leaching of gold from carbonaceous A study of thiosulfate leaching of gold from carbonaceous

    A comparison of thiosulfate with cyanide leaching of gold from carbonaceous ore showed that thiosulfate is chemically better and economically more advantageous. Description. Online access for this thesis was created in part with support from the Institute of Museum and Library Services IMLS administered by the Nevada State Library Archives .

  • Improvement of thiosulfate stability in gold leaching Improvement of thiosulfate stability in gold leaching

    May 01 2003 Ammonium thiosulfate is a noncyanide lixiviant for gold leaching. However the major problem with this leaching method has been the high consumption of reagents. To leach a mild-refractory copper-bearing gold ore the authors used a reagent combination of 0.3M NH42S2O3 0.03M CuSO4 and 3M NH3 at pH 10.2 for 24 hours. In the testing thiosulfate consumption was 30 kgt of ore.