2019-Sustainable Industrial Processing Summit
SIPS2019 Volume 1: Angell Intl. Symp. / Molten Salt, Ionic & Glass-forming Liquids: Processing and Sustainability

Editors:F. Kongoli, M. Gaune-Escard, J. Dupont, R. Fehrmann, A. Loidl, D. MacFarlane, R. Richert, M. Watanabe, L. Wondraczek, M. Yoshizawa-Fujita, Y. Yue
Publisher:Flogen Star OUTREACH
Publication Year:2019
Pages:177 pages
ISBN:978-1-989820-00-1
ISSN:2291-1227 (Metals and Materials Processing in a Clean Environment Series)
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    Stabilization of spent salts by an oxidation and distillation process: optimization of the oxidation step

    Benoit Claux1;
    1CEA, Is sur Tille, France;
    Type of Paper: Regular
    Id Paper: 129
    Topic: 13

    Abstract:

    Spent salts coming from pyrochemical processing are composed of mixtures of NaCl, KCl, and CaCl2 with various dissolved/precipitated species according to the process used and the storage time and conditions.
    In order to stabilize these materials, a pyrochemical treatment has been developed by CEA Valduc. It consists in carrying out two steps: pyro-oxidation [1] and distillation [2, 3].
    Pyro-oxidation, also known as oxidation-chlorination, allows oxidizing An into a stable oxide: AnO2. This requires the use of Cl2 gas to remove excess carbonate through the exhaust of CO2 and O2 gases:
    Ongoing work is underway on the stability of carbonate in salt mixtures. Preliminary results and literrature [4] suggest that carbonates ions can be completely decomposed into carbon dioxide and a stable oxide by simply changing the composition of the molten bath. Indeed, salts containing CaCl2 showed quick and total decomposition of carbonates.
    Follow-up work will have to verify the experimental conditions for which the chlorination step can be replaced by a simple stirring or addition of CaCl2 to remove excess carbonates.

    Keywords:

    Chloride; Moltensalt; Oxides; Processing;

    References:

    [1] Y.-Z. Cho, G.-H. Park, H.-C. Yang, D.-S. Han, H.-S. Lee, I.-T. Kim, Journal of Nuclear Science and Technology, 46 (2009) 1004-1011.
    [2] H.-C. Eun, H.C. Yang, Y.J. Cho, H.-S. Park, E.-H. Kim, I.T. Kim, Journal of Nuclear Science and Technology, 44 (2007) 1295-1300.
    [3] H.C. Yang, H.C. Eun, Y.J. Cho, H.S. Lee, I.T. Kim, Nuclear Technology, 171 (2010) 300-305.
    [4] Y.-Z. Cho, H.-C. Yang, H.-C. Eun, E.-H. Kim, I.-T. Kim, Journal of Nuclear Science and Technology, 45 (2008) 459-463.

    Cite this article as:

    Claux B. (2019). Stabilization of spent salts by an oxidation and distillation process: optimization of the oxidation step. In F. Kongoli, M. Gaune-Escard, J. Dupont, R. Fehrmann, A. Loidl, D. MacFarlane, R. Richert, M. Watanabe, L. Wondraczek, M. Yoshizawa-Fujita, Y. Yue (Eds.), Sustainable Industrial Processing Summit SIPS2019 Volume 1: Angell Intl. Symp. / Molten Salt, Ionic & Glass-forming Liquids: Processing and Sustainability (pp. 176-177). Montreal, Canada: FLOGEN Star Outreach