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Towards a Silicate Matrix for the Immobilisation of Halide-rich Wastes

Published online by Cambridge University Press:  30 July 2013

M. R. Gilbert
M. R. Gilbert*
Affiliation:
AWE, Aldermaston, Reading, RG7 4PR, UK.
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Abstract

Single-phase calcium chlorosilicate and sodalite, two potential ceramic waste-forms for the immobilisation of CaCl2-based pyroprocessing wastes, have been fabricated at temperatures below the volatilisation point of CaCl2. Solid solutions doped with Sm3+ as an inactive analogue for trivalent actinides have been fabricated and characterised. XRD analysis shows both phases will successfully accommodate Sm3+, with the sodalite in particular remaining single-phase. Fabrication of Sm-doped calcium chlorosilicate in air results in the formation of SmOCl and Ca(Si2O5) secondary phases, however, calcination in an inert atmosphere is shown to successfully retard the formation of SmOCl allowing for higher levels of doping.

Keywords

ceramicClwaste management
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1518: Symposium LL – Scientific Basis for Nuclear Waste Management XXXVI , 2012 , pp. 91 - 96
Copyright
Copyright © Materials Research Society 2013 

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References

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