Abstract
This paper reports on the behavior of mercury and its compounds during the thiosulfate leaching and recovery of gold. Thiosulfate solutions are shown to dissolve Hg0 and Hg2Cl2 to a similar extent as cyanide, but the leaching of HgS is significantly slower in thiosulfate solutions compared to cyanide. Hence, the use of thiosulfate may be an option for treating ores containing high levels of cinnabar, especially since the legislation concerning the discharge or sale of mercury is becoming more restrictive. The deportment of mercury during gold thiosulfate loading and recovery using a strongly basic anion-exchange resin was also studied. Although the mercury thiosulfate complex loads on the resin, the adsorption is weaker than for gold, with an equilibrium constant between gold and mercury of 51. Resin loaded with gold, mercury and copper was pre-eluted with thiosulfate (to remove copper) and eluted with a chloride and sulfite eluant. The majority of the mercury is eluted by the eluant and, hence, its deportment closely follows gold and the eluate would need to be treated to remove either mercury during or prior to gold electrowinning.
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References
ACGIH, 1997, “Threshold limit values for chemical substances and physical agents and biological exposure indices”, American Conference of Governmental Industrial Hygienists, Cincinnati, Ohio.
Armah, S.Y., Nyarko, B.J., Adotey, D.K., Adomako, D., and Akaho, E.H., 2004, “The impact of small-scale mining activities on the levels of mercury in the environment: The case of Prestea and its environs,” Radio-analytical and Nuclear Chemistry, Vol. 262, pp. 685–690.
Aylmore, M.G., and Muir, D.M., 2001, “Thiosulfate leaching of gold — a review,” Minerals Engineering, Vol. 14, pp. 135–174.
Chandra, I., and Jeffrey, M.I., 2005, “A fundamental study of ferric oxalate for dissolving gold in thiosulfate solutions,” Hydrometallurgy, Vol. 77, pp. 191–201.
Eisler, R., 2006, Mercury Hazards To Living Organisms, Taylor and Francis group, 307 pp.
Feng, D., and Van Deventer, J.S.J., 2002, “Leaching behaviour of sulphides in ammoniacal thiosulphate systems,” Hydrometallurgy, Vol. 63, pp. 189–200.
Jeffrey, M., Heath, J., Hewitt, D., Brunt, S., and Dai, X., 2008, “A thiosulfate process for recovering gold from refractory ores which encompasses pressure oxidation, leaching, resin adsorption, elution, and electrowinning”, Hydrometallurgy 2008: Proceedings of the Sixth International Symposium, C.A. Young, P.R. Taylor, C.G. Anderson, and Y. Choi, ed., SME, pp. 791–800.
Jeffrey, M., Hewitt, D., Dai, X., and Brunt, S., 2009, “Ion exchange adsorption and elution for recovering gold thiosulfate from leach solutions”, the Fifth International Conference on Hydrometallurgy, Zhangjiajie, China.
Jeffrey, M.I., and Brunt, S.D., 2007, “The quantification of thiosulfate and polythionates in gold leach solutions and on anion exchange resins,” Hydrometallurgy, Vol. 89, pp. 52–60.
Kudo, A., and Miyahara, S., 1991, “A case-history—Minamata mercury pollution in Japan—from loss of human lives to decontamination,” Water Science and Technology, Vol. 23, p. 283.
Langhans, J.W., Lei, K.P.V., and Carnahan, T.G., 1992, “Copper-catalyzed thiosulfate leaching of low-grade gold ores,” Hydrometallurgy, Vol. 29, pp. 191–203.
Muslim, A., Pareek, V.K., Tadé, M.O., Jeffrey, M.I., and Zhang, H.G., 2009, “Adsorption of polythionates and thiosulfate on strong base anion exchange resins,” Proceedings of Chemeca 2009, 2009, Perth, Australia, Engineers Australia.
Nicol, M.J., and O’Malley, G., 2002, “Recovering gold from thiosulfate leach pulps via ion exchange,” JOM, Vol. 54, pp. 44–46.
Robins, R.G., and Jayaweera, L., 1993, “The recovery of mercury from mineral extraction residues using hydrometallurgical techniques”, U.S. Environmental Agency, Publication Technology Review No. 214, pp. 43–45.
Shaw, S.A., Al, T.A., and Macquarrie, K.T., 2006, “Mercury mobility in unsaturated gold mine tailings, Murray Brook Mine, New Brunswick, Canada,” Applied Geochemistry, Vol. 21, pp. 1986–1998.
Smith, R.M., and Martell, A.E., 1974, Critical Stability Constants, Volume 2: Inorganic Ligands, Plenum Press, NY.
Smith, A., and Mudder, T., 1991, The Cyanide Compendium — Chemistry and Treatment of Cyanidation Wastes, Mining Journal Books Ltd, London, United Kingdom.
Tassel, F., Rubio, J., Misra, M., and Jena, B.C., 1997, “Removal of mercury from gold cyanide solution by dissolved air flotation,” Minerals Engineering, Vol 10, No. 8, pp. 803–811.
Willett, K.L., Turner, R.R., and Beauchamp, J.J., 1992, “Effect of chemical form of mercury on the performance of dosed soils in standard leaching tests: EP and TCLP,” Hazardous Waste and Hazardous Materials, Vol. 9, No. 3, pp. 275–288.
Valenzuela, A., and Fytas, K., 2002, “Mercury Management in small-scale mining,” International Journal of Mining, Reclamation and Environment, Vol. 16, pp. 2–23.
Wan, R.Y., 1997, “Importance of solution chemistry for thiosulphate leaching of gold”, World Gold’ 97, Carlton, Victoria, AusIMM.
Wang, Q., Kim, D., Dionysiou, D., Sorial, G., and Timberlake, D., 2004, “Sources and remediation for mercury contamination in aquatic systems: a literature review,” Environmental Pollution, Vol. 131, pp. 323–336.
West-Sells, P.G., and Hackl, R.P., 2005, “A novel thiosulfate leach process for the treatment of carbonaceous gold ores”, Treatment of Gold Ores, G. Deschenes, D. Hodouinn, and L. Lorenzen, ed., 2005, Montreal, Canada, Met.Soc., CIM, pp. 209–223.
Zhang, H., Nicol, M.I., and Staunton, W.P., 2005, “An electrochemical study of an alternative process for the leaching of gold in thiosulfate solutions,” Treatment of Gold Ores, G. Deschenes, D. Hodouinn, and L. Lorenzen, ed., 2005, Montreal, Canada, Met.Soc., CIM, pp. 243–257.
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Paper number MMP-09-039.
Discussion of this peer-reviewed and approved paper is invited and must be submitted to SME Publications Dept. prior to May 31, 2011.
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Oraby, E.A., Jeffrey, M.I. & Browner, R.E. The deportment of mercury during thiosulfate leaching and resin-in-pulp recovery of gold from ores. Mining, Metallurgy & Exploration 27, 184–189 (2010). https://doi.org/10.1007/BF03402441
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DOI: https://doi.org/10.1007/BF03402441