extracted gold from ore by the thiosulfat

  • Thiosulfate leaching of goldA review ScienceDirect

    Feb 01, 20010183;32;Thiosulfate is considered a non toxic alternative to cyanide and can leach gold faster than cyanide. In the conventional cyanide process, the recovery of gold and silver from ores is hindered by a variety of metal impurities like copper, arsenic, antimony, zinc and nickel, since these consume either cyanide or oxygen.

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  • The treatment of coppergold ores by ammonium thiosulfate

    2.2. Overview of thiosulfate technology for gold extraction. The use of thiosulfate for the recovery of precious metals was first proposed in the 19th century and is known as the Patera Process. It was applied in 1858 by Von Patera for silver recovery. The process utilizes the solubility of silver chloride in a solution of sodium thiosulfate.

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  • How gold is extracted by Cyanidation Process Refresh Science

    Jun 17, 20200183;32;This extraction is done by converting the gold to a water soluble form. The cyanidation process of gold extraction or the use of cyanide is the most common leaching process, used in the extraction of gold from its ores. Some countries do not approve of this method of gold extraction because of the poisonous nature of the cyanide. Steps to

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  • Gold cyanidation

    Gold cyanidation (also known as the cyanide process or the MacArthur Forrest process) is a hydrometallurgical technique for extracting gold from low grade ore by converting the gold to a water soluble coordination complex.It is the most commonly used leaching process for gold extraction Production of reagents for mineral processing to recover gold, copper, zinc and silver represents

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  • US6632264B2 Gold recovery from thiosulfate leaching

    Gold and optionally copper are recovered from the eluate by electrowinning or precipitation. Processes for recovering gold from copper gold ores thiosulfate leaching or gold ores copper catalyzed

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  • THIOSULPHATE LEACHING AN ALTERNATIVE TO

    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 preg robbing ores.

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  • Using Nickel as a Catalyst in Ammonium Thiosulfate

    For extracting gold from the copper bearing sulfide ore, a higher ammonia and thiosulfate concentrations were required with 0.0001 mol/dm 3 of Ni 2+. The ammonium thiuosulfate consumption with nickel as catalyst on the copper bearing sulfide ore was about 15 kg/t ore less than that using copper as catalyst.

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

    Aug 15, 20200183;32;It is obvious that the copper citrate (Cu 2 Cit 2 H 2 4) complex is beneficial for gold extraction from ore in thiosulfate solutions due to the catalytic action (Wang et al., 2020). It also shows though gold cannot be effectively leached by copper citrate solutions in the absence of thiosulfate, the presence of citrate can significantly improve gold leaching in copper thiosulfate solutions.

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  • Thiosulfate Leaching of Gold from Copper Bearing Ores

    Thiourea leaching from an oxidized gold copper ore with 90 95% gold extraction was also reported (McInnes et al., 1989). However, acid pre leaching of soluble copper was required in order to reduce thiourea consumption to acceptable levels. Ammoniacal Thiosulfate Leaching. Ammonium thiosulfate has been used in photography for many decades.

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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. In addition, thiosulfate can be cheaper than cyanide.

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  • Extraction of Gold and Copper from a Gold Ore Thiosulfate

    Gold and copper thiosulfate adsorption from an alkaline gold ore leachate was investigated by using polyethylenimine coated iron oxide magnetic nanoparticles (NPs). The ore, sourced from a mine in

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  • (PDF) Ammoniacal thiosulfate leaching of gold from a

    In this current study, the extraction of gold from a high grade copper rich gold ore by copper assisted ammoniacal thiosulphate leaching was studied by adopting Taguchi L 9, (3 3) experimental

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  • Gold strike with thiosulphate MINING.COM

    Jun 19, 20150183;32;As part of the thiosulphate process at Goldstrike, gold bearing ore is heated as a thick slurry of ore, air, water and limestone in large pressure chambers or

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  • Gold strike with thiosulphate MINING.COM

    Jun 19, 20150183;32;Within the tanks, the slurry interacts with thiosulfate and a fine, bead like material called resin that collects the gold. At full capacity, 13,400 tons of ore can be processed daily, with

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  • extracted gold from ore by the thiosulfat

    extracted gold from ore by the thiosulfat. How gold is extracted AnswersThey first mine it. There are several ways. A lot of gold is in ore deep underground; they dig down to it, break it up and haul it out. Other gold is in stream beds, and machines called sluices . Chat Online

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  • thiosulfate gold leaching

    Thiosulfate Gold Extraction Leach These solutions have very little solving action upon the natural sulphide contained in gold bearing ore, and should be suitable solutions for the treatment of gold or silver ore, as they have a greater solving power than cyanide of potash, are not poisonous, and can be obtained in very large quantities at a

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  • Gold Extraction an overview ScienceDirect Topics

    Thiosulfate as an Alternative Lixiviant to Cyanide for Gold Ores M.G. Aylmore, in Gold Ore Processing (Second Edition), 2016 3.5 Effect of pH Value The effect of pH value on gold extraction for various ore types is shown in Figure 28.4.

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  • Biooxidation Thiosulfate Leaching of Refractory Gold

    A process of biooxidation followed by thiosulfate leaching of gold from refractory gold concentrate was investigated. Mineralogical studies on the concentrate showed that very fine gold grains (10 m) were encapsulated in pyrite and arsenopyrite, while the amount of monomer gold was only 21%.The gold bearing sample was identified as a high sulfur fine sized wrapped type refractory gold

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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

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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

    Effect of additives on non ammoniacal gold extraction, thiosulfate consumption polythionates formation during leaching of a carbonaceous ore with 0.1 M Na 2S 2O 3, 100 psig O 2, at pH 11 12, and pulp density 33% over 6h(Ref. 19) (Gold extraction in the absence of additives was 82 83%, S described in text) %Au Extraction

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  • THIOSULPHATE LEACHING AN ALTERNATIVE TO

    and greater efficiency with gold deposits associated with preg robbing ores. The thiosulphate leaching process, followed by resin in pulp gold extraction, has been developed by SGS to the point where it is a technically and economically viable alternative to cyanidation for some gold bearing ore bodies. Whether the leaching is performed in

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  • Gold strike with thiosulphate CSIRO

    Article from resourceful Issue 7, June 2015. The first gold bar produced with the thiosulphate process was poured in late 2014 at Barricks Goldstrike plant in Nevada, USA and operations are ramping up to recover gold from four million tonnes of stockpiled ore that was uneconomic to

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  • Extraction of Gold and Copper from a Gold Ore Thiosulfate

    ABSTRACT. Gold and copper thiosulfate adsorption from an alkaline gold ore leachate was investigated by using polyethylenimine coated iron oxide magnetic nanoparticles (NPs). The ore, sourced from a mine in Nevada, USA, was leached with calcium thiosulfate for 48 h in the presence of Cu (II) at a pH of 8 and a temperature of 50176;C.

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  • Gold strike with thiosulphate CSIRO

    Article from resourceful Issue 7, June 2015. The first gold bar produced with the thiosulphate process was poured in late 2014 at Barricks Goldstrike plant in Nevada, USA and operations are ramping up to recover gold from four million tonnes of stockpiled ore that was uneconomic to

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  • mining machine thiosulfate leaching gold process

    Thiosulphate Leaching Mining SGS. Thiosulfate leaching is particularly well suited to state of the art resin in pulp (RIP) gold recovery technologies Thiosulfate leaching is an alkaline process (usually operated in the pH 8 to 10 range) so there are no concerns with corrosion of equipment in the recovery operation; The main chemical components of the thiosulfate leaching

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  • Extracting Gold from Ore by Aqua Regia method Gold

    Nov 09, 20170183;32;Although a variety of treatments to extract gold exist, unless you have loads of money to invest (perhaps something closer to US $100,000) your best bet is to investigate the potential for treating the ore by gravity based methods (gravity methods means the use of gold's high density to separate it from low density materials like quartz).

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  • CN101824545A Method for extracting gold from thiosulfate

    The invention relates to a method for extracting gold from thiosulfate adopting ethanediamine as an additive. The method comprises the following steps that the ethanediamineas is adopted as ligand and forms ethanediamine copper (II) complex ion with copper (II) ion, the formed ethanediamine copper (II) complex ion is used as the additive, and the thiosulfate is used as a leaching agent and is

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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

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  • GOLD LECHING FROM A SAUDI ORE BY THE NONPOLLUTING

    thiosulfate process. Several gold localities are scattered in the Arabian Shield of the kingdom of Saudi Arabia which has about 20 million tons of recoverable gold ores. In working gold mines, ores are treated using the hazardous cyanidation process through the CIL or heap leaching. Although several Saudi gold mines are in operation since 1980s, very

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  • Gold has been extracted from carbonaceous ore Free

    Sep 27, 20200183;32;A two part method was developed, resulting in it being an economically viable replacement to cyanidation for various types of ores which contained gold; the process of thiosulfate leaching is followed by resin in pulp gold extraction. Thiosulfate leaching can produce comparable gold recovery to cyanidation and in some cases, such as preg robbing ores which are naturally occurring

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  • Bromine leaching as an alternative method for gold

    A general kinetic model derived from the cyanidation of three ore samples can be described by the following equation E = EI (1 e kt) where E is the gold extraction (%) at time t (hours), EI is

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