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

Published online by Cambridge University Press:  15 February 2011

G. De Angelis
Affiliation:
Dipartimento Fusione, Tecnologie e Presidio Nucleare, ENEA Casaccia, Via Anguillarese 301, 00123 S. Maria di Galeria, Roma, Italy
I. Bardez-Giboire
Affiliation:
Laboratoire d'étude et Développement de Matrices de Conditionnement, CEA Marcoule, DEN/DTCD/SECM/LDMC, 30207 Bagnols sur Cèze Cedex, France
M. Mariani
Affiliation:
Dipartimento di Energia, Sezione Ingegneria Nucleare, Politecnico di Milano, Via Giuseppe Ponzio 34/3, 20133 Milano, Italy
M. Capone
Affiliation:
Dipartimento Fusione, Tecnologie e Presidio Nucleare, ENEA Casaccia, Via Anguillarese 301, 00123 S. Maria di Galeria, Roma, Italy
M. Chartier
Affiliation:
Laboratoire d'étude et Développement de Matrices de Conditionnement, CEA Marcoule, DEN/DTCD/SECM/LDMC, 30207 Bagnols sur Cèze Cedex, France
E. Macerata
Affiliation:
Dipartimento di Energia, Sezione Ingegneria Nucleare, Politecnico di Milano, Via Giuseppe Ponzio 34/3, 20133 Milano, Italy
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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.

Type
Research Article
Copyright
Copyright © Materials Research Society 2009

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References

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)CrossRefGoogle Scholar
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)CrossRefGoogle Scholar
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)Google Scholar
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)Google Scholar

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