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Pyrochemical reprocessing is a potential route for the reprocessing of fuels from next-generation reactors. Lanthanide fission products may be separated from the reprocessing salt by a number of methods; however, salts may be entrained in the resultant product. This work demonstrates conceptual monazite glass-ceramic wasteforms based on the quarternary (100− x )(10Na 2 O–36Fe 2 O 3 –54P 2 O 5 )– x La 2 O 3  ( x  = 5, 10, 15), with La 2 O 3  as a surrogate for the lanthanide oxide waste stream. Samples were produced by the melting of La 2 O 3  with a sodium-iron-phosphate glass frit and characterised by XRD and SEM–EDX. The monazite phase was successfully formed at all waste loadings with clear segregation of La to the crystalline phase; however, high La 2 O 3  loading (&gt;10 mol%) was found to destabilise the glass system resulting in gross crystallisation. These initial results indicate that monazite glass-ceramics are promising wasteforms for this waste stream.

Development of monazite glass-ceramic wasteforms for the immobilisation of pyroprocessing wastes