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Thiosulfate-copper-ammonia leaching of pure gold and pressure oxidized concentrate

Treść / Zawartość
Identyfikatory
Warianty tytułu
Języki publikacji
EN
Abstrakty
EN
In this research cyanide-free leaching of pure gold and pressure oxidized refractory gold concentrate by thiosulfate-copper-ammonia solutions were examined. A quartz crystal microbalance (QCM) was used to study gold leaching as a factorial series where the best gold leaching rate (2.987 mg/(cm2∙h)) was achieved with a solution consisting of 0.2 M (NH4)2S2O3, 1.2 M NH3, 0.01 M CuSO4 and 0.4 M Na2SO4. Temperature had the greatest effect on the gold leaching rate. An increase in thiosulfate concentration (0.1–0.2 M) increased gold dissolution. The combined effect of temperature and ammonia concentration had a statistically significant effect on the gold leaching rate at 0.1 M M2S2O3. Combination of applied potential and NH3:S2O3 ratio had a statistically significant effect on the gold leaching rate at 0.2 M M2S2O3. An increase in applied potential decreased the gold dissolution rate at low ammonia concentrations but increased it at high concentrations. A pressure oxidized gold concentrate was leached for 6 hours in the batch reactor leaching experiments. The effect of rotative velocity (1.26–1.56 m/s) and slurry density (10–30 wt%) was investigated at the following leaching parameters: 0.2 M Na2S2O3, 0.6 M NH3, 0.01 M CuSO4, 0.4 M Na2SO4. Lower slurry density (10 wt%) resulted in a higher Au leaching efficiency. An increase in the rotation rate did not have an effect on the final Au leaching recovery. The best Au leaching efficiency (89%) was achieved with 590 rpm mixing, 1.56 m/s rotative velocity and 10 wt% slurry density.
Rocznik
Strony
1079--1091
Opis fizyczny
Bibliogr. 50 poz., rys., tab.
Twórcy
autor
  • Department of Materials Science and Engineering, Aalto University, PO Box 16200, 00076 Aalto, Finland
autor
  • Department of Materials Science and Engineering, Aalto University, PO Box 16200, 00076 Aalto, Finland
autor
  • Department of Materials Science and Engineering, Aalto University, PO Box 16200, 00076 Aalto, Finland
autor
  • Department of Materials Science and Engineering, Aalto University, PO Box 16200, 00076 Aalto, Finland
  • VTT Technical Research Centre of Finland, Biologinkuja 7, 02150 Espoo, Finland
autor
  • Department of Materials Science and Engineering, Aalto University, PO Box 16200, 00076 Aalto, Finland
autor
  • Department of Materials Science and Engineering, Aalto University, PO Box 16200, 00076 Aalto, Finland
Bibliografia
  • ABBRUZZESE, C., FORNARI, P., MASSIDDA, R., VEGLIÒ, UBALDINI, S., 1995, Thiosulfate leaching for gold hydrometallurgy, Hydrometallurgy 39, 265-276.
  • AHTIAINEN, R., LUNDSTROM, M., 2016, Preg-robbing of gold in chloride-bromide solution, Physicochem. Probl. Miner. Process 52, 1, 244-251.
  • AYLMORE, M.G., MUIR, D.M., 2001, Thiosulfate leaching of gold – a review, Miner. Eng. 14, 135-174.
  • BREUER, P.L., JEFFREY, M.I., 2000, Thiosulfate leaching kinetics of gold in the presence of copper and ammonia, Miner. Eng. 13(10-11), 1071-1081.
  • BREUER, P.L., JEFFREY, M.I., 2002, An electrochemical study of gold leaching in thiosulfate solutions containing copper and ammonia, Hydrometallurgy 65, 145-157.
  • BREUER, P.L., JEFFREY, M.I., 2003, The reduction of copper(II) and the oxidation of thiosulfate and oxysulfur anions in gold leaching solutions, Hydrometallurgy 70, 163-173.
  • BUTTRY, D.A., WARD, M.D., 1992, Measurement of interfacial processes at electrode surfaces with the electrochemical quartz crystal microbalance, Chem. Rev. 92, 1355-1379.
  • BYERLEY, J., FOUDA, S.A., REMPEL, G.L., 1973, Kinetics and mechanism of the oxidation of thiosulphate ions by copper(II) ions in aqueous ammonia solution, Dalton Trans. 7, 889-893.
  • CAO, C., HU, J., GONG, Q., 1992. Leaching of gold by low concentration thiosulfate solution, Randol Gold Forum, Vancouver, Randol International, Colorado, USA, 293-298.
  • CHOI, Y., BARON, J.Y., WANG, Q., LANGHANS, J., KONDOS, P., 2013. Thiosulfate processing – from lab curiosity to commercial application, in: Proceedings of the World Gold Conference 2013, The Australian Institute of Mining and Metallurgy Publication Series 9, 45-50.
  • CHU, C.K., BREUER, P.L., JEFFREY, M.I., 2003, The impact of thiosulfate oxidation products on the oxidation of gold in ammonia thiosulfate solutions, Miner. Eng. 16, 265-271.
  • CONTROLS, S., 2015. Nippon N-CHLO PILOT Plant, retrieved from http://www.sgcontrols.com.au/ case-studies/nippon-n-chlo-pilot-plant, 2015.
  • DUNDEE SUSTAINABLE TECHNOLOGIES, 2015. Dundee sustainable technologies: cyanide free gold extraction process. Retrieved from: www.dundeetechnologies.com/en/technology, 2015.
  • DUNDEE, TECHNOLOGIES DURABLES INC., 2015, Method and a system for gold extraction with halogens, US 9051626 B2.
  • FENG, D., VAN DEVENTER, J.S.J., 2002, Leaching behaviour of sulphides in ammoniacal thiosulphate systems, Hydrometallurgy 63, 189-200.
  • FENG, D., VAN DEVENTER, J.S.J., 2006, Ammoniacal thiosulfate leaching of gold in presence of pyrite, Hydrometallurgy 82, 126-132.
  • FENG, D., VAN DEVENTER, J.S.J., 2007, The effect of sulphur species on thiosulfate leaching of gold, Miner. Eng. 20, 273-281.
  • FENG, D., VAN DEVENTER, J.S.J., 2010, Effect of thiosulphate salts on ammoniacal thiosulphate leaching of gold, Hydrometallurgy 105, 120-126.
  • FERRON, J., 2012. Silver recovery from complex concentrates – a mineralogical approach, T.T. Chen Honorary Symposium on Hydrometallurgy, Electrometallurgy and Materials Characterization, Orlando, Florida, USA, 371-382.
  • HA, V.H., LEE, J-C., JEONG, J., HAI, H.T., JHA, M.K., 2010, Thiosulfate leaching of gold from waste mobile phones, J. Hazard. Mater. 178, 1115-1119.
  • HEMMATI, M., HENDRIX, J.L., NELSON, J.H., MILOSAVLJEVIC, E.B., 1989. Study of the thiosulphate leaching of gold from carbonaceous ore and the quantitative determination of thiosulphate in the leached solution, Extraction Metallurgy '89 Symposium, Institute of Mining and Metallurgy, London, UK, 665-678.
  • HU, J., GONG Q., 1992, Recovery of gold from thiosulfate solution, Huagong Yejin (Eng. Chem. Metall.) 10, 45-50.
  • INTEC LTD. (2009). Intec Gold Process. Australia: © Intec Ltd.
  • JEFFREY, M.I., 2001, Kinetics aspects of gold and silver leaching in ammonia-thiosulfate solutions, Hydrometallurgy 60, 7-16.
  • JEFFREY, M.I., WATLING, K., HOPE, G.A., WOODS, R., 2008, Identification of surface species that inhibit and passivate thiosulfate leaching of gold, Miner. Eng. 21, 443-452.
  • LALANCETTE, J-M., DUBREUIL, B., LEMIEUX, D., 2015, Method and a system for gold extraction with halogens, US 9051626 B2.
  • LANGHANS, J.W., LEI, K.P.V., CARNAHAN, T.G., 1992, Copper-catalysed thiosulfate leaching of low grade gold ores, Hydrometallurgy 29, 191-203.
  • MACKLIN, M. G., BREWER, P. A., BALTEANU, D., COULTHARD, T. J., DRIGA, B., HOWARD, A. J & ZAHARIA, S., 2003, The long term fate and environmental significance of contaminant metals released by the January and March 2000 mining tailings dam failure in Maramures County, upper Tisa basin, Romania, Appl. Geochem. 18(2), 241-257.
  • MARSDEN, J.O., HOUSE, C.I., 2006. The chemistry of gold extraction, 2nd Edition, Society of Mining, Metallurgy and Exploration (SME), Littleton (CO), USA, 651.
  • MKS DATA ANALYTICS SOLUTIONS, Modde 8.0 / 9.1, http://umetrics.com/
  • MOYES, H., HOULLIS, F., 2010, Recovering metals from sulfidic materials, US7858056 B2.
  • MOYES, J., HOULLIS, F, 2010, Recovering metals from sulfidic materials, US 7858056 B2.
  • MUIR, D.M., AYLMORE, M.G., 2004. Thiosulfate as an alternative to cyanide for gold processing – issues and impediments, Trans. Inst. Min. Metall., Sect. C, 113(1), 2-11.
  • RABAI, G., EPSTEIN, I.R., 1992, Equilibria and kinetics of the fast interaction between copper(II) and thiosulfate ions in aqueous solution, Inorg. Chem. 31, 3239-3242.
  • ROBINSON, T., LEE, F., HEIDEL, A. (2012). Demonstration of the CESL Gold Process. CESL Limited.
  • SENANAYAKE, G., 2004, Analysis of reaction kinetics, speciation and mechanism of gold leaching in and thiosulfate oxidation by ammoniacal copper(II) solutions, Hydrometallurgy 75, 55-75.
  • SENANAYAKE, G., 2005a, Gold leaching by thiosulfate solutions: critical review on copper(II)—thiosulfate—oxygen interactions, Miner. Eng. 18, 995-1009.
  • SENANAYAKE, G., 2005b, The role of ligands in thiosulfate leaching of gold, Gold Bull. 38/4, 170-180.
  • SENANAYAKE, G., 2005c, Kinetic model for anodic oxidation of gold in thiosulfate media based on adsorption of MS2O32-ion-pair, Hydrometallurgy 76, 233-238.
  • SENANAYAKE, G., 2007, Review of rate constants for thiosulphate leaching of gold from ores, concentrates and flat surfaces: Effect of host minerals and pH, Miner. Eng. 20, 1-15.
  • SENANAYAKE, G., PERERA, W.N., NICOL, M.J., 2003. Thermodynamic studies of the gold (III)/(I)/(0) redox system in ammonia-thiosulphate solutions at 25 C, in: Hydrometallurgy 2003, Proceedings of the 5th International Symposium, 155-168.
  • SENANAYAKE, G., ZHANG, X.M., 2012a, Gold leaching by copper(II) in ammoniacal thiosulphate solutions in the presence of additives. Part I: A review of the effect of hard–soft and Lewis acid-base properties and interactions of ions, Hydrometallurgy 115-116, 1-20.
  • SENANAYAKE, G., ZHANG, X.M., 2012b, Gold leaching by copper(II) in ammoniacal thiosulphate solutions in the presence of additives. Part II: Effect of residual Cu(II), pH and redox potentials on reactivity of colloidal gold, Hydrometallurgy 115-116, 21-29.
  • TOZAWA, K., INUI, Y., UMETSU, Y., 1981, Dissolution of gold in ammoniacal thiosulfate solution, 110th Annual Meeting of AIME, A81-25: 1-12.
  • WAN, R.Y., BRIERLEY, J.A., 1997, Thiosulfate leaching following biooxidation pretreatment for gold recovery from refractory carbonaceous-sulfidic ore, Min. Eng. 76, 76-80.
  • WAN, R.Y., LEVIER, K.M., 2003, Solution chemistry factors for gold thiosulfate heap leaching, Int. J. Miner. Process. 72, 311-322.
  • XIA, X., YEN, W.T., 2003, Improvement of thiosulfate stability in gold leaching, Miner. Metall. Proc. 20(2), 68-72.
  • YEN, W.T., AGHAMIRIAN, M., DESCHENES, G., THEBEN, S., 1998, Gold extraction from mild refractory ore using ammonium thiosulfate, in: Proceedings of the International Symposium on Gold Recovery, 15.
  • YEN, W.T., STOGRAN, K., FUJITA, T., 1996, Gold extraction from a copper bearing ore by thiosulfate leaching, Resources Treatment Technology 43(2), 83-87.
  • ZHANG, S., NICOL, M.J., 2003, An electrochemical study of the dissolution of gold in thiosulfate solutions Part I: Alkaline solutions, J. Appl. Electrochem. 33, 767-775.
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-2995df03-ca06-431b-a9f0-4350764d3c32
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