Abstract
The release of fluid inclusions has a strong potential for the unintentional activation of pyrite during flotation. The present study aims to characterize fluid inclusions in a natural pure pyrite. The results indicate that a certain amount of fluid inclusions exist in the pyrite. The fluid inclusions assume a variety of shapes, including long strips, oval shapes and irregular shapes, with sizes that range from a few microns to dozens of microns. From the EDS results of hollow positions that resulted from the fracture of the fluid inclusions on the pyrite surface, certain amounts of Al, Cr, C, O, Ag and Cu were clearly detected; these elements were not detected in FeS2 pyrite itself. The contents of the inclusions were released into solution when the sample was subjected to a grinding process. Under experimental conditions of 2 g of pyrite cleaned in 40 mL of pure deionized water under an inert atmosphere, the concentrations of Cu, Fe, Cl− and SO 2−4 released from the inclusions reached concentrations of 3.29 × 10−6, 32.52 × 10−6, 51.57 × 10−6 and 75.90 × 10−6 mol/L, respectively. These values are significantly greater than those from the experimental nonoxidative and oxidative dissolution of the pyrite. The fluid inclusions of pyrite were, therefore, concluded to represent the dominant sources of Cu, Fe, Cl− and SO 2−4 in the aqueous solution. The present investigation provides a new understanding of the source of the unavoidable metal ions in the pulp and may benefit understanding of the flotation theory and environmental geochemistry.
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References
Acero, P., Cama, J. and Ayora, C., 2007, “Sphalerite dissolution kinetics in acidic environment,” Applied Geochemistry, Vol. 22, pp. 1872–1883.
Campbell, A.R. and Hackbarth, C.J., 1984, “Internal features of ore minerals seen with the infrared microscope,” Economic Geology, Vol.79, pp. 1387–1392.
Campbell, A.R. and Panter, K.S., 1990, “Comparison of fluid inclusions in coexisting (cogenetic) wolframite, cassiterite, and quartz from St-Michaels Mount and Cligga Head, Cornwall, England,” Geochimica Et Cosmochimica Acta, Vol. 54, pp. 673–681.
Chandra, A.P., and Gerson, A.R., 2009, “A review of the fundamental studies of the copper activation mechanisms for selective flotation of the sulfide minerals, sphalerite and pyrite,” Advances in Colloid and Interface Science, Vol. 145, pp. 97–110.
Dean, J.A., 1991, Handbook of Chemistry, 13th ed., Science Press, China, pp. 1643–1659 (in Chinese).
Deditius, A.P., Utsunomiya, S., Reich, M., Kesler, S.E., Ewing, R.C., Hough, R.M. and Walshe, J.L., 2010, “Trace-metal nanoparticles in pyrite,” Geochimica Et Cosmochimica Acta, Vol. 74, pp. A216–A216.
Jamie, J.W., Barry, S., Clara, C.W., Teresa, E.J., Martin S.A., 2009, “Anomalously metal-rich fluids form hydrothermal ore deposits,” Science, Vol. 323, pp. 764–767.
Kelly, W.C. and Burgio, P.A., 1983, “Cryogenic scanning electron microscopy of fluid inclusions in ore and gangue minerals,” Economic Geology, Vol. 78, pp. 1262–1267.
Kouzmanov, K., Ramboz, L.B.C., Rouer, O. and Bény, J.M., 2002, “Morphology, origin and infrared microthermometry of fluid inclusions in pyrite from the Radka epithermal copper deposit, Srednogorie zone, Bulgaria,” Mineralium Deposita, Vol, 37, pp. 599–613.
Leppinen, J.O., 1990, “FTIR and flotation investigation of the adsorption of ethyl xanthate on activated and non-activated sulfide minerals,” International Journal of Mineral Processing, Vol. 30, pp. 245.
Liu, J., Wen, S.M., **an, Y.J., Deng, J.S. and Huang, Y.L., 2012, “Dissolubility and surface properties of a natural pure sphalerite in aqueous solution,” Minerals & Metallurgical Processing, 2012, Vol. 29, No. 2, pp.75–81.
Lu, H.Z., Fan, H.D., Ni, P., Ou, G.X., Shen, K. and Zhang, W.H., 2004, Fluid Inclusion, Science Press, Bei**g (in Chinese).
Lüders, K. and Ziemann, M., 1999, “Possibilities and limits of infrared light icrothermometry applied to studies of pyrite-hosted fluid inclusions,” Chemical Geology, Vol. 154, pp. 169–178.
Mancano, D.P. and Campbell, A.R., 1995, “Microthermometry of enargite-hosted fluid inclusions from the Lepanto, Philippines, high-sulfidation Cu-Au deposit,” Geochimica et Cosmochimica Acta, Vol. 59, pp. 3909–3916.
Metzger, F.W., Kelly, W.C., Nesbitt, B.E., and Essene, E.J., 1977, “Scanning electron microscopy of daughter minerals in fluid inclusions,” Economic Geology, Vol. 72, pp. 141–152.
Moura, A., 2005, “Fluids from the Neves Corvo massive sulfide ores, Iberian Pyrite Belt, Portugal,” Chemical Geology, Vol. 223, pp.153–169.
Richards, J.P. and Kerrich, R., 1993, “Observations of zoning and fluid inclusions in pyrite using a transmitted light microscope (λ≤ 1.9 µm),” Economic Geology, Vol. 88, pp. 716–723.
Wang, X., Forssberg, E. and Bolin, N.J., 1989, “The aqueous surface chemistry of activation in the flotation of sulfide minerals: a review. Part I: An electrochemical model,” Mineral Processing and Extractive Metallurgy Review, Vol. 4, pp. 139–165.
Wilkinson, J.J., 2001, “Fluid inclusions in hydrothermal ore deposits,” Lithos, Vol. 55, pp. 229–272.
Wilson, J.W.J., Kesler, S.E., Cloke, P.L. and Kelly, W.C., 1980, “Fluid inclusion geochemistry of the Granisle and Bell porphyry copper deposits, British Columbia,” Economic Geology, Vol. 75, pp. 45–61.
Yunnan Geology Bureau, 1990, “The discussion and analysis of guarantee degree of Yunnan mineral resources for there development,” Date Office of Yunnan Geology Bureau, Yunnan, China (in Chinese).
Zolensky, M.E., and Bodnar, R.J., 1982, “Identification of fluid inclusion daughter minerals using Gandolfi X-ray techniques,” American Mineralogist, Vol. 67, pp. 134–141.
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Paper number MMP-12-020.
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**an, Y., Wen, S., Liu, J. et al. Discovery of a new source of unavoidable ions in pyrite aqueous solutions. Mining, Metallurgy & Exploration 30, 117–121 (2013). https://doi.org/10.1007/BF03402414
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DOI: https://doi.org/10.1007/BF03402414