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Synthesis and characterization of sodalite as matrix for conditioning chloride spent salts from pyroprocesses

  • G. De Angelis (a1), I. Bardez-Giboire (a2), M. Mariani (a3), M. Capone (a1), M. Chartier (a2) and E. Macerata (a3)...

Abstract

Two different methods have been used to synthesize sodalite for conditioning of chloride salt wastes coming from pyroprocesses: the first one, starting from kaolinite through the intermediate nepheline phase; the second one, starting from silica and sodium aluminate reagents, directly. The obtained products have been characterized by means of several analyses. In particular, different instrumental techniques – stereomicroscopy, scanning electron microscopy (SEMEDS), density measurements, thermogravimetric analysis, X-rays diffraction, FTIR spectroscopy – were performed revealing that the synthesis from kaolinite is the best method, provided that rigorous conditions are followed. The use of an argon atmosphere for the preparation of pellets of reagents is strictly necessary for the obtainment of a good quality product.

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1 Ackerman, J.P., Johnson, T.R., Chow, L.S.H., Carls, E.L., Hannum, W.H. and Laidler, J.J., “Treatment of wastes in the IFR fuel cycle”, Progress in Nuclear Energy, 31, No.1/2, 141154 (1997)
2 Angelis, G. De, Nannicini, R., Martini, F., Mazzocchia, C. and Modica, G., “Different methods to synthesize sodalite as a matrix for conditioning chloride spent salts from pyroprocessing”, Radiochim. Acta, 96, 303310 (2008)
3 Bardez, I., Laloy, J., Rigaud, D., Cauli, A., Angelis, G. De, Nannicini, R., Martini, F., Mazzocchia, C., Modica, G., Robina, M. La, Luca, V. and Vance, E. R., “Proposition of a solid matrix suitable for the conditioning of chloride waste salt”, Deliverable D44 of the European Programme EUROPART (Contract No. FI6W-CT-2003-508 854) (2007)
4 Koyama, T., Matsubara, C., Sawa, T. and Tanaka, H., “Waste form development for immobilization of radioactive halide salt generated from pyrometalurgical reprocessing.”, Proceedings from GLOBAL 1997, 1, 610615 (1997)

Synthesis and characterization of sodalite as matrix for conditioning chloride spent salts from pyroprocesses

  • G. De Angelis (a1), I. Bardez-Giboire (a2), M. Mariani (a3), M. Capone (a1), M. Chartier (a2) and E. Macerata (a3)...

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