ammonium thiosulfate mineral processing gold leaching

ammonium thiosulfate mineral processing gold leaching

ammonium thiosulfate mineral processing gold leaching

  • THIOSULPHATE LEACHING – AN ALTERNATIVE TO

    SGS MINERALS SERVICES – T3 SGS 869 10-2008 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

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  • Thiosulfate leaching of gold—A 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.

  • Cited by: 491
  • 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 which can make cyanide unattractive in some circumstances.

  • Thiosulfate leaching of gold - A review Request PDF

    Thiosulfate leaching can be considered a non-toxic process, the gold dissolution rates can be faster than conventional cyanidation and, due to the

  • Thiosulfate leaching of gold—A 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.

  • Cited by: 491
  • COMPARISON OF CYANIDE AND THIOSULPHATE LEACHING

    The conventional cyanidation process in gold leaching has been used since 1887. It is currently the main gold leaching process in the world. However, gold cyanidation process has serious environmental risks if an accident occurs in the process because of the toxicity of cyanide.

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  • Thiosulfate Leaching of Gold from Copper Bearing Ores

    Studies on the ammonium thiosulfate extraction of gold and silver from sulfide concentrates and various (ammoniacal) pressure leach residues (Berezowsky and Sefton, 1979), and dissolution of pure gold under pressure oxidation conditions in ammonium thiosulfate solutions (Tozawa et al., 1981), have shown that the chemistry of these systems is ...

  • Ammonium thiosulfate - Wikipedia

    OverviewProductionApplicationsSafetySee also

    Ammonium thiosulfate (ammonium thiosulphate in British English) is an inorganic compound with the formula (NH4)2S2O3. It is white crystalline solid with ammonia odor, readily soluble in water, slightly soluble in acetone and insoluble in ethanol and diethyl ether.

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  • The treatment of copper–gold ores by ammonium thiosulfate ...

    Newmont Gold evaluated the application of ammonium thiosulfate on a demonstration heap leach of 327,000 metric tons of low-grade carbonaceous sulfidic ore that was pretreated by biooxidation. The average gold recovery for thiosulfate heap leach at a particle size of minus 1.9 cm was found to be approximately 55%.

  • Cited by: 116
  • Ammoniacal thiosulphate leaching of gold ore

    The European Journal of Mineral Processing and Environmental Protection Vol.3, No.3, 1303-0868, 2003, pp. 344-352 Ammoniacal thiosulphate leaching of gold ore R.K. Rath, N. Hiroyoshi, M. Tsunekawa*, T. Hirajima Laboratory of Mineral Processing and Resources Recycling, Graduate School of Engineering, Hokkaido University, Sapporo, 060-8628, Japan

  • Thiosulfate Leaching of Gold a Review - [PDF Document]

    Jul 16, 2016  THIOSULFATE LEACHING OF GOLD A REVIEW . MARK G AYLMORE AND DAVID M MUIR . CSIRO Division of Minerals, PO Box 90 Bentley WA 6982, Australia. E-mail: [email protected] (Received 26 May 2000 ;accepted 20 October 2000) ABSTRACT . The ammoniacal thiosulfate leaching process for gold and silver extraction

  • Solution chemistry factors for gold thiosulfate heap leaching

    3. Thiosulfate leaching of gold. Gold dissolution in ammonium thiosulfate solution is described by the following reaction: (1) 4 Au +8 S 2 O 3 2− +2 H 2 O + O 2 =4 Au (S 2 O 3) 2 3− +4 OH − The dissolution of gold in the presence of oxygen was found to be very slow. Cupric ion was found to have a strong catalytic effect on the rate of ...

  • Ammonium thiosulfate - Wikipedia

    Ammonium thiosulfate (ammonium thiosulphate in British English) is an inorganic compound with the formula (NH 4) 2 S 2 O 3.It is white crystalline solid with ammonia odor, readily soluble in water, slightly soluble in acetone and insoluble in ethanol and diethyl ether.

  • Process mineralogy of refractory gold ore in thiosulfate ...

    The leaching process consisted of a pretreatment of the mineral (in ammonium hydroxide and copper sulfate during 12 h with and without air bubbling) followed by leaching (in ammonium thiosulfate solution and EDTA at a pH ∼ 10 during 24 h with mechanical stirring at a rate of 250 rpm) which rendered a gold-release of 81.57%.

  • The treatment of copper–gold ores by ammonium thiosulfate ...

    The treatment of copper–gold ores by ammonium thiosulfate leaching Article in Hydrometallurgy 66(1-3):1-21 October 2002 with 1,744 Reads How we measure 'reads'

  • Thiosulphate Leaching Mining SGS

    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.

  • (PDF) A Review of Thiosulfate Leaching of Gold: Focus on ...

    A Review of Thiosulfate Leaching of Gold: Focus on Thiosulfate Consumption and Gold Recovery from Pregnant Solution. ... D. The treatment of copper–gold ores by ammonium thiosulfate leaching.

  • Ammoniacal thiosulfate leaching of refractory oxide gold ...

    Ammoniacal thiosulfate leaching of refractory oxide gold ore was investigated. According to X-ray fluorescence and fire assay analyses, the ore

  • Thiosulfate-copper-ammonia leaching of pure gold and ...

    Keywords: gold leaching, thiosulfate, quartz crystal microbalance Introduction The industrially applied leaching method for gold ores and concentrates involves the use of cyanide as a ligand for dissolution of gold. Cyanide is technically and economically a viable method for gold processing, and therefore it is hard to bring a

  • Leaching of Gold from the Waste Mobile Phone Printed ...

    The ammonium thiosulfate contents in the leach liquors were in agreement with the quantity of gold leached in the respective pH ranges. In this process the copper sulfate worked as a catalyst. The experiment conducted with complete PCBs scrap exhibited a maximum leaching of 78.8% gold at the above optimised condition.

  • (PDF) Treatment of a Copper-Rich Gold Ore by Ammonia ...

    Thiosulfate leaching can be considered a non-toxic process, the gold dissolution rates can be faster than conventional cyanidation and, due to the

  • Iodide Pressure Oxidation Gold Leaching - Autoclave

    The authors of this study have recently applied pressure leaching with iodide to refractory gold ores, a technique developed as a noncyanide process for refractory gold ores. This new process is a one stage operation, where the oxidation of sulfide and the dissolution of gold are completed in an autoclave within 2-4 hours.

  • 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.

  • Leaching gold by reactive flow of ammonium thiosulfate ...

    Here, we present a study of gold leaching, where the gold layer is removed from a microchannel wall within a high aspect ratio channel (8 μm × 4 mm cross-section; 1:500). The etchant is an aqueous solution of sodium thiosulfate, ammonium hydroxide, and copper sulfate.

  • (PDF) Treatment of a Copper-Rich Gold Ore by Ammonia ...

    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 ...

  • Iodide Pressure Oxidation Gold Leaching - Autoclave

    The authors of this study have recently applied pressure leaching with iodide to refractory gold ores, a technique developed as a noncyanide process for refractory gold ores. This new process is a one stage operation, where the oxidation of sulfide and the dissolution of gold

  • 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.

  • Leaching gold by reactive flow of ammonium thiosulfate ...

    Here, we present a study of gold leaching, where the gold layer is removed from a microchannel wall within a high aspect ratio channel (8 μm × 4 mm cross-section; 1:500). The etchant is an aqueous solution of sodium thiosulfate, ammonium hydroxide, and copper sulfate.

  • 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

  • The treatment of copper-gold ores by ammonium thiosulfate ...

    The application of ammonium thiosulfate for the treatment of copper-gold ores has been investigated. Leaching studies were conducted with copper minerals, copper minerals with gold addition to solution and copper-gold samples of different copper and gold grades. The behaviour of thiosulfate, tetrathionate and sulfate in solution was studied using ion chromatography. The copper sulfide minerals ...

  • 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.

  • Importance of Solution Chemistry for Thiosulphate Leaching ...

    Gold recovery by catalytic copper ammonium thiosulphate solution has been studied. Such a process strategy is very attractive for leaching certain difficult-to-treat ores and presents lessened lixiviant toxicity compared to cyanide. Newmont Gold Company has evaluated the ammonium thiosulphate heap leach process for gold recovery from low- grade carbonaceous sulphidic refractory ores following ...

  • Gold Recovery from Electronic Waste by Pressure Oxidation

    Leaching process involves time consuming stages to reach the total metal dissolution. Leaching of gold and silver from printed circuit boards (PCBs) with cyanide, nitric acid and thiosulfate has been performed with reaction times greater than 2 hours [6].

  • Ammonium thiosulfate ecological alternative to replace ...

    Nov 21, 2014  Ammonium thiosulfate ecological alternative to replace sodium cyanide in gold and silver dissolution in low-grade ores, M.C Hernández, E. Acosta, M.C Avitia, H. Peña,I. Portillo,L. Rodríguez ...

  • 作者: International Minerals Engineering Congress
  • GOLD LECHING FROM A SAUDI ORE BY THE NONPOLLUTING ...

    thiosulfate leaching of gold (Chen, 2008). This shows how much a mineralogical investigation is important to be performed before leaching study of any gold ore by the 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.

  • CMC Chimie - Gold WITHOUT cyanide - YouTube

    Aug 18, 2015  Eco-friendly Gold and Silver Processing Technology Using Ammonium Thiosulfate Leaching - Pilot station presentation.

  • Effect of additives on thiosulfate leaching of a gold ore

    In a resin-in-leach system, full gold recovery was also achievable with sufficient resin after 24 h leach with 0.06 M fresh ammonium thiosulfate and 2 mM EDTA at an agitation speed of 250 r/min. Key words: Gold leaching, Thiosulfate, Additives, Leaching kinetics, Thiosulfate stability

  • Using Nickel as a Catalyst in Ammonium Thiosulfate ...

    On a 100 mass%-75 μm of silicate type gold ore containing 16 g/t Au and 0.2 mass% of Fe and C, the nickel catalyzed ammonium thiosulfate solution could extract 95% of gold with the 1.2 kg/t-ore of ammonium thiosulfate consumption in 24 hours at the most favorable reagent combination of 0.0001 mol/dm 3 NiSO 4, 0.05 mol/dm 3 (NH 4) 2 S 2 O 3 and ...