Pan American Silver Corp. | Mitacs

An method for silver ore is necessary. Among all the proposed , is the most promising one. Low toxicity and low cost make attractive. ... Regions start to regulate or ban the usage of cyanide worldwide, so to becomes essential ...

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  • COMPARISON OF CYANIDE AND THIOSULPHATE LEACHING …

    COMPARISON OF CYANIDE AND THIOSULPHATE LEACHING …

    is also kinetically and environmentally one of the most promising Sodium and ammonium are the two main commercial sources of They are the most common tiosulphate salt forms that are used in research on …

  • Optimizing and evaluating the operational factors ...

    Optimizing and evaluating the operational factors ...

    In recent years, thiourea, , chlorine and acid methods have been developed to , but none of these has yet gained industrial application [7–10]. Gold follows an electrochemical–chemical reaction between cyanide and gold at the particle surface and throughout the particle porous ...

  • A Review on Alternative Gold Recovery Reagents to Cyanide

    A Review on Alternative Gold Recovery Reagents to Cyanide

    The thiocyanate ion SCN−is an alternative less harmful leaching reagent to cyanide NaCN or KaCN. Gold in an aqueous thiocyanate solution forms stable AuI and AuIII complexes, as following reactions show:,,, - 2 Au 2SCN Au SCN e+= +−7

  • Alternative Lixiviants to Cyanide for Leaching Gold Ores ...

    Alternative Lixiviants to Cyanide for Leaching Gold Ores ...

     · 2. Thiosulfate Leaching. In recent years, thiosulfate has been considered an attractive alternative to for A process using thiosulfate has been developed and commercialized for Barrick Golds Goldstrike operation in Nevada, USA.

  • comparative study of auxiliary oxidants in the cyanidation ...

    comparative study of auxiliary oxidants in the cyanidation ...

    ii Abstract Noticeably lower extraction of silver than gold in conventional process has been commonly observed. Acanthite Ag 2 S is one of the typical silver minerals with low solubility in aqueous medium, which result in low overall silver extraction. This thesis discusses the performance of hydrogen peroxide H 2 O 2, calcium peroxide CaO 2, lead nitrate PbNO 3 2 and ...

  • Thiosulphate Leaching | Mining | SGS

    Thiosulphate Leaching | Mining | SGS

    Thiosulfate leaching is a process that recovers gold from ore without the use of SGS developed the thiosulfate leaching process because in some jurisdictions, increased regulation pressure means that cyanide cannot be used or transported. We are a global technical leader 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 complicated due to the increasingly complex nature of the remaining gold-bearing ore bodies. This worldwide phenomenon is the driving force for the development of technologies for the and recovery of gold from so-called double refractory ores. Barrick Gold recently commercialized a unique calcium plant to treat ...

  • Leaching of Gold - Tripod

    Leaching of Gold - Tripod

    The disadvantages of of the toxicity associated with cyanide and its ineffectiveness in treating refractory ores and concentrates. Other lixiviants have been study to overcome these weaknesses of . Of these lixiviants, the most commonly studied are the halides Cl, Br, and I, thiourea, and .

  • Fundamental aspects of thiosulfate leaching of silver ...

    Fundamental aspects of thiosulfate leaching of silver ...

    This thesis publishes experimental evidence that supports the use of thiosulfate with different additives as a potential alternative to conventional cyanidation for silver sulfide leaching. The leaching of silver sulfide by cupric-ammonia thiosulfate can occur either by the substitution of cupric or cuprous for silver.

  • The role of ligands and oxidants in thiosulfate leaching ...

    The role of ligands and oxidants in thiosulfate leaching ...

    Despite the fact that the gold mining industry accounts for only 13% of total cyanide consumption there is growing public concern over the use of toxic cyanide for gold extraction. Many researchers have identified that is the most likely to …

  • Eluent | Semantic Scholar

    Eluent | Semantic Scholar

    A Review of of Gold: Focus on Consumption and Gold Recovery from Pregnant Solution Bin Xu , W. Kong , Q. Li , Yong-bin Yang , T. Jiang , X. Liu 2017

  • School of Engineering and Information Technology

    School of Engineering and Information Technology

    has received much attention non-cyanide lixiviant for gold recovery over the last three decades. In particular, a number of studies have shown that an ammoniacal copperII-sulfate/sodium system offers fast kinetics but there are difficulties in controlling the complex solution chemistry and there

  • Leaching Kinetics of Gold Involved in the System S2O32 ...

    Leaching Kinetics of Gold Involved in the System S2O32 ...

    Abstract: Thiosulphate gold is an technology to the of gold ores. Ethylenediaminetetraacetic acid is referred to as EDTA.A study on the kinetics of gold involved in the system S 2 O 3 2--EDTA-Cu 2+ for the gold in this paper. The effect of temperature and of the addition of copper has been also analyzed, temperature has a remarkable effect over the ...

  • Thiosulfate Leaching Process for Gold Extraction

    Thiosulfate Leaching Process for Gold Extraction

    Thiosulfate leaching appears to be one of the most promising alternatives to cyanidation. Understanding gold thiosulfate leaching system plays a crucial role in order to effectively extract gold, in which the kinetics and equilibrium adsorption of thiosulfate, polythionates, gold thiosulfate and copper onto resin in

  • Leaching of Sludge from the AVR Process with Ammonium ...

    Leaching of Sludge from the AVR Process with Ammonium ...

    processes necessary to implement the flotation concentrates without pressure and for materials with high values of copper usually 5 to 20 % which are not suitable for , for which it is studied stabilized ammonium as a substitute for cyanide [5]. There exist encapsulated

  • Thiosulphate Leaching | SGS South Africa

    Thiosulphate Leaching | SGS South Africa

    Thiosulfate leaching provides a less toxic alternative to cyanidation in the recovery of gold from ore. SGS can help ensure regulatory compliance and good gold recovery.

  • Biooxidation‒thiosulfate leaching of refractory gold ...

    Biooxidation‒thiosulfate leaching of refractory gold ...

    However, only 28.6% final efficiency was obtained when the optimum condition was used to the high-sulfur gold concentrate. The gold efficiency of the biooxidation‒ process increased by 25.2% and 56.5% compared with those of direct and direct of concentrate, respectively. 4.

  • What are the Cyanide-Free Gold Recovery Methods?

    What are the Cyanide-Free Gold Recovery Methods?

     · Therefore, the gold rate is much faster than that of method. 2. Bromination and Iodization Process. The dissolution reaction of gold in bromine-bromide is as follows: 2Au+3Br2+2Br-→2AuBr4-The mechanism of bromine -bromide is …

  • Thiosulfate as an Alternative Lixiviant to Cyanide for ...

    Thiosulfate as an Alternative Lixiviant to Cyanide for ...

     · of native silver is considered to be similar to the electrochemical corrosion process proposed for of gold. Silver is oxidized at the anodic site to form silver Ag S 2 O 3 2 3 −, while cupric copper is reduced at the cathodic site to form cuprous Cu S 2 O 3 3 5 −.

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