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The thermodynamics of arsenates, selenites, and sulfates in the oxidation zone of sulfide ores: VIII. Field of thermal stability of synthetic analog of chalcomenite, its dehydration and dissociation

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Abstract

The objective of this paper is to study the thermal stability of the synthetic analog of chalcomenite, CuSeO3 · 2H2O, and its dehydration and dissociation, in an experimental context. The study has been carried out by a comprehensive application of thermogravimetry (TG), differential scanning calorimetry (DSC), and high-temperature X-ray diffraction at a temperature range of 25–600°C. It has been established that CuSeO3 · 2H2O dehydrates at 202–264°C in three stages corresponding to the formation of intermediate CuSeO3 · 2H2O and CuSeO3 · 1/3H2O hydrate phases. At 480–595°C anhydrous CuSeO3 breaks down into CuO and SeO2 via the formation of a Cu4O(SeO3)3 phase. Enthalpies of the reactions at each stage of the CuSeO3 · 2H2O dehydration and CuSeO3 dissociation have been determined and their kinetic analysis has been carried out.

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Authors and Affiliations

  1. St. Petersburg State University, Universitetskaya nab. 7/9, St. Petersburg, 199034, Russia

    E. L. Fokina, E. V. Klimova, M. V. Charykova, V. G. Krivovichev, N. V. Platonova & V. V. Semenova

  2. Institut für Geowissenschaften, Abt. Mineralogie-Kristallographie, Universität Kiel, Kiel, D-24098, Germany

    W. Depmeier

Authors
  1. E. L. Fokina
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  2. E. V. Klimova
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  3. M. V. Charykova
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  4. V. G. Krivovichev
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  5. N. V. Platonova
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  6. V. V. Semenova
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  7. W. Depmeier
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Corresponding author

Correspondence to E. L. Fokina.

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Original Russian Text © E.L. Fokina, E.V. Klimova, M.V. Charykova, V.G. Krivovichev, N.V. Platonova, V.V. Semenova, W. Depmeier, 2013, published in Zapiski Rossiiskogo Mineralogicheskogo Obshchestva, 2013, No. 3, pp. 52–64.

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Fokina, E.L., Klimova, E.V., Charykova, M.V. et al. The thermodynamics of arsenates, selenites, and sulfates in the oxidation zone of sulfide ores: VIII. Field of thermal stability of synthetic analog of chalcomenite, its dehydration and dissociation. Geol. Ore Deposits 56, 538–545 (2014). https://doi.org/10.1134/S1075701514070058

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  • DOI: https://doi.org/10.1134/S1075701514070058

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