Thiosulfate Leaching Of Gold

  • Biooxidationthiosulfate leaching of refractory gold ...

    Biooxidationthiosulfate leaching of refractory gold ...

     · Ammoniacal thiosulfate was used for gold extraction from the biooxidation residue of the refractory gold concentrate. The results showed that the optimal reagent conditions were M thiosulfate, M copper (II), M ammonia, and M sulfite. Under these conditions, a maximum gold leaching efficiency of % was obtained.

  • Thiosulphate Leaching | SGS Angola

    Thiosulphate Leaching | SGS Angola

    Thiosulfate leaching offers a number of benefits related to gold recovery yields and environmental concerns: Thiosulfate leaching of gold ores has great potential to reduce the impact on the environment. Unlike cyanide, which is highly toxic, the chemicals used in the thiosulfate leaching process are benign.

  • THE RECOVERY OF GOLD FROM A PREAGNANT GOLDTHIOSULFATE .

    THE RECOVERY OF GOLD FROM A PREAGNANT GOLDTHIOSULFATE .

    leaching with thiosulfate solution can be considered as a promising alternative to cyanide leaching. In the presence of ammonia and copper in solution, gold can be readily leached by thiosul fate at alkaline condition to form a goldthiosulfate complex. A possible mechanism for the leaching reaction has been proposed as (Nicol and O'Malley, 2002): Au + Cu(NH3)42+ + 4S2O32J Au(S2O3)23 ...

  • The leaching and adsorption of gold using low ...

    The leaching and adsorption of gold using low ...

    challenges, thiosulfate has been applied in pilot plant since the 1980s, and has been used in heap leaching processes by Newmont Gold (Wan et al., 1994). Industrially, Barrick Gold has implemented a calcium thiosulphate retrofit at their Nevada operations (Choi, 2013). A development of in situ gold leaching using ferric EDTA and ferric oxalate complexes in thiosulfate solutions has been ...

  • Leaching Gold With Thiosulfate

    Leaching Gold With Thiosulfate

    Leaching Gold With Thiosulfate. The appliion of ammonium thiosulfate for the treatment of coppergold ores has been investigated leaching studies were conducted with copper minerals copper minerals with gold addition to solution and coppergold samples of different copper and gold grades the behaviour of thiosulfate tetrathionate and sulfate in solution was studied using ion chromatography ...

  • THE STUDY OF THE KINETICS OF GOLD LEACHING IN THE .

    THE STUDY OF THE KINETICS OF GOLD LEACHING IN THE .

    The gold leaching rate in ammonium thiosulfate in the presence of copper species is mainly controlled by the hodic process, which is under diffusion or mixed kinetics control. The results of the rotating gold disk leaching study are consistent with those from the electrochemical study. The gold leaching process in .

  • The modes of gold loss in the calcium thiosulfate leaching ...

    The modes of gold loss in the calcium thiosulfate leaching ...

    The processing of gold is becoming more complied due to the increasingly complex nature of the remaining goldbearing ore bodies. This worldwide phenomenon is the driving force for the development of alternative technologies for the leaching and recovery of gold from socalled double refractory ores. Barrick Gold recently commercialized a unique calcium thiosulfate leaching plant to treat ...

  • Fundamental aspects of gold leaching in thiosulfate ...

    Fundamental aspects of gold leaching in thiosulfate ...

    The kinetics and mechanism of gold leaching in the ammoniathiosulfatecopper (ATSCu) system have been studied using the rotating electrochemical quartz crystal microbalance (REQCM). Anodic polarization, hodic polarization and leaching experiments were included in this study. The effect of concentration of different reagents, applied potential, pH, temperature, and electrode rotating ...

  • Thiosulphate leaching of gold in the presence of ...

    Thiosulphate leaching of gold in the presence of ...

    The gold leaching was significantly retarded at a hexametaphosphate concentration beyond g/L. Silver leaching followed a similar trend to gold leaching. Orthophosphate slightly increased the overall extent of gold and silver extractions. Thiosulphate consumption decreased with increasing hexametaphosphate and orthophosphate concentrations in the leaching of the sulphide ore. After 48 .

  • Experimental study on thiosulfate leaching of gold from a ...

    Experimental study on thiosulfate leaching of gold from a ...

    thiosulfate process, halogen process, polysulfide process and stone sulfur mixture process have been reported. Among them, thiosulfate method has the advantages of fast gold leaching speed, nontoxic, insensitive to impurities and no corrosion to equipment[2]. Especially for refractory gold ores containing as, Cu and carbon, the

  • leaching of gold with thiosulfate

    leaching of gold with thiosulfate

     · 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 advantages including its lower toxicity and greater efficiency with gold deposits associated with pregrobbing ores.

  • Associated Sulfide Minerals in Thiosulfate Leaching of ...

    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 silie gold ore. In the leaching test on the reference gold ore, about 93% of gold was extracted within hours. The presence of various amount of pyrite, pyrrhotite, chalcopyrite ...

  • Beneficial effect of silver in thiosulfate leaching of gold

    Beneficial effect of silver in thiosulfate leaching of gold

    The beneficial effect of silver in gold leaching by oxygen in alkaline cyanide and thiosulfate media has been reported by previous researchers. This paper describes a preliminary study of a similar effect in thiosulfate leaching of gold by ammoniacal copper(II) at ambient temperature. Silver dissolves faster than gold in ammoniacal copper(II) thiosulfate solutions.

  • Thiosulfate Gold Leaching

    Thiosulfate Gold Leaching

    Figure Mechanism of gold leaching in ATS system in the presence of copper ion Ouyang 2001 42 Figure The electrochemical model for the copper alysis mechanism of leaching gold with ammoniacal thiosulfate. Aylmore et al 2001a 43 Figure The effect of pyridine on gold leaching in ATSCu system 45. Learn More

  • Common Types of Noncyanide Gold Recovery Chemicals

    Common Types of Noncyanide Gold Recovery Chemicals

     · The method using thiosulfate as noncyanide gold recovery chemicals is usually carried out at 5060 ° C, and Cu2+, SO2 and sulfite are added as stabilizers to prevent the decomposition of thiosulfate ions. The pH of the leaching solution was adjusted by ammonia solution. The characteristics of using thiosulfate as a gold recovery chemicals are: (1) nontoxic, (2) fast leaching speed ...

  • A review of gold extraction using noncyanide lixiviants ...

    A review of gold extraction using noncyanide lixiviants ...

    Alkaline sulfurcontaining lixiviants, including thiosulfate, polysulfides, and alkaline sulfide solutions, stand out as a promising class of alternatives to cyanide because of their low toxicity, high efficiency, and strong adaptability. In this paper, we summarized the research progress and remaining challenges in gold extraction using these noncyanide reagents.

  • USB2

    USB2

    Method for thiosulfate leaching of precious metalcontaining materials Download PDF Info Publiion number USB2. USB2 US13/020,505 USA USB2 US B2 US B2 US B2 US A US A US A US B2 US B2 US B2 Authority US United States Prior art keywords precious .

  • Ammoniacal thiosulfate and sodium cyanide leaching of preg ...

    Ammoniacal thiosulfate and sodium cyanide leaching of preg ...

    Gold leaching was primarily limited by the volume of lixiviant contacting the carbonaceous matter; however, a slight kinetic limitation was observed in ammoniacal thiosulfate leaching at higher flow rates. The percentage of gold leached by sodium cyanide from carbonaceous matter demineralized from autoclaved Goldstrike ore was

  • Common Types of Noncyanide Gold Recovery Chemicals

    Common Types of Noncyanide Gold Recovery Chemicals

     · The characteristics of using thiosulfate as a gold recovery chemicals are: (1) nontoxic, (2) fast leaching speed, generally only takes 3 hours to achieve the best economic effect, (3) can process refractory gold ores containing copper, arsenic, antimony, selenium, etc. (4) the price of this noncyanide gold recovery chemical is low and it has no corrosion to the equipment.