Abstract
The aim of this study is to create a physicochemical analysis of the formation conditions of synthetic zinc selenite, ZnSeO3 · 2H2O and an experimental investigation of its thermal stability, dehydration, and dissociation. This study has been carried out using a comprehensive thermal analysis (thermogravimetry and differential scanning calorimetry) within the temperature interval from 25–600°C. It has been established that ZnSeO3 · 2H2O dehydrates at 81–222°C through four stages corresponding to the formation of intermediate hydrate species: ZnSeO3 · 5/3H2O, ZnSeO3 · H2O, and ZnSeO3 · 1/3H2O. It is suggested that under natural oxidation conditions zinc selenite precipitates as stable (ZnSeO3 · 2H2O) or metastable (ZnSeO3 · H2O) species. Anhydrous ZnSeO3 presumably exists at a higher temperature (up to 479°C) and breaks down within a temperature interval of 479–597°C to form ZnO and SeO2.
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References
De Camargo, W. and Svisero, D., Crystallography of zinc selenite dihydrate Acta Cryst., 1968, Bd. 24, S. 461–462.
Charykova, M.V., Krivovichev, V.G., Yakovenko, O.S., et al., Thermodynamics of arsenates, selenites, and sulfates in the oxidation zone of sulfide ores: VI. Solubility of synthetic analogs of ahlfeldite and cobaltomenite at 25°C, Geol. Ore Deposits, 2012, vol. 54, spec. issue 8 (Zapiski of the Russian Mineralogical Society), pp. 638–646.
Chukhlantsev, V.G., Solubility product of selenite of some metals, Zh. Neorg. Khimii, 1956, vol. 1, no. 10, pp. 2300–2305.
Engelen, B., Baumer, U., Hermann, B., et al., Polymorphie und Pseudo-Symmetrie der Hydrate MSeO3 · H2O (M = Mn, Co, Ni, Zn, Cd), Z. Anorg. Allg. Chem., 1996, vol. 622, pp. 1886–1892.
Fokina, E.L., Klimova, E.V., Charykova, M.V., et al., Thermodynamics of arsenates, selenites, and sulfates in the oxidation zone of sulfide ores: VIII. Field of thermal stability of synthetic analog of chalcomenite and its dehydration and dissociation, Geol. Ore Deposits, 2014, vol. 56, spec. issue 7 (Zapiski of the Russian Mineralogical Society), pp.
Gladkova, V.F. and Kondrashova, Yu.D., Crystal structure of ZnSeO3 · 2H2O, Kristallografiya, 1964, vol. 9, pp. 190–196.
Gospodinov, G.G., Physicochemical investigation of the ZnO-SeO2-H2O system and some properties of the compounds, Thermochimica Acta, 1984, vol. 77, pp. 439–444.
Krivovichev, V.G., Charykova, M.V., Yakovenko, O.S., and Depmeier, W., Thermodynamics of arsenates, selenites, and sulfates in the oxidation zone of sulfide ores: IV. Eh-pH diagrams of the Me-Se-H2O systems (Me = Co, Ni, Fe, Cu, Zn, Pb) at 25°C, Geol. Ore Deposits, 2011, vol. 53, spec. issue 7 (Zapiski of the Russian Mineralogical Society), pp. 514–527.
Krivovichev, S.V. and Filatov, S.K., Kristallokhimiya mineralov i neorganicheskikh soedinenii s kompleksami anionotsentrirovannykh tetraedrov (Crystal Chemistry of Minerals and Inorganic Compounds with Anion-Centered Tetrahedra), St. Petersburg: St. Petersburg State Univ., 2001.
Krivovichev, V.G., Tarasevich, D.A., Charykova, M.V., et al., Thermodynamics of arsenates, selenites, and sulfates in the oxidation zone of sulfide ores: V. Chalcomenite and its synthetic analog, properties, and formation conditions, Geol. Ore Deposits, 2012, vol. 54, spec. issue 7 (Zapiski of the Russian Mineralogical Society), pp. 498–502.
Kumok, V.N., Kuleshova, O.M., and Karabin, L.A., Proizvedeniya rastvorimosti (Products of Solubility), Novosibirsk, 1983.
Leshchinskaya, Z.L. and Selivanova, N.M., Formation heat of zinc selenite (ZnSeO3 · H2O), Zh. Fiz. Khimii, 1964, vol. 38, pp. 972–974.
Lieder, O.J. and Gattow, G., Synthetic crystals, Naturwissenschaften, 1967, vol. 54, p. 443.
Markovsky, L.Ya. and Sapozhnikov, Yu.P., Various species and some properties of intermediate selenium-acid zinc, Zh. Strukt. Khimii, 1960, vol. 1, pp. 346–352.
Masson, M.R., Lutz, H.D., and Engelen, B. Sulfites, Selenites, and Tellurites. Vol. 26, IUPAC Solubilities Data Series, Oxford: Pergamon Press, 1986( cited after Olin et al., 2005).
Olin, A., Nolang, B., Osadchii, E. G., et al., Chemical Thermodynamics of Selenium, Amsterdam: Elsevier, 2005.
Sapozhnikov, Yu.P. and Markovsky, L.Ya., Determination of formation enthalpies of various phases of zinc, cadmium, and mercury selenites, in Khimiya i tekhnologiya lyuminoforov (Chemistry and Technology of Luminophores), Markovsky, L.Ya. Ed, Leningrad: GIPKh, 1966.
Šeby, F., Potin-Gautier, M., and Giffaut, E., A critical review of thermodynamic data for selenium species at 25°C, Chem. Geol., 2001, vol. 171, pp. 173–194.
Sharmasarkar, S., Reddy, K. J., and Vance, G. F. Preliminary quantification of metal selenite solubility in aqueous solutions, Chem. Geol., 1996. vol. 132, pp. 165–170.
Termicheskie konstanty veshchestv (Thermal Constants of Compounds), Glushko, V.P, Ed., Moscow: Acad Sci. USSR, 1965–1982, vol. 1–10.
Vlaev, L.T., Genieva, S.D., and Georgieva, V.G. Study of the crystallization fields of nickel(II) selenites in the NiSeO3-SeO2-H2O system, J. Therm. Anal. Calorim., 2006, vol. 86, pp. 449–456.
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Original Russian Text © M.V. Charykova, E.L. Fokina, E.V. Klimova, V.G. Krivovichev, V.V. Semenova, 2013, published in Zapiski Rossiiskogo Mineralogicheskogo Obshchestva, 2013, No. 5, pp. 11–20.
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Charykova, M.V., Fokina, E.L., Klimova, E.V. et al. Thermodynamics of arsenates, selenites, and sulfates in the oxidation zone of sulfide ores. IX. Physicochemical formation conditions and thermal stability of zinc selenites. Geol. Ore Deposits 56, 546–552 (2014). https://doi.org/10.1134/S1075701514070046
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DOI: https://doi.org/10.1134/S1075701514070046