Encapsulation of heterovalent ions of two simulated high-level nuclear wastes and crystallization into single-phase NZP-based wasteforms |
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Authors: | S Pratheep Kumar G Buvaneswari R Raja Madhavan K V Govindan Kutty |
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Affiliation: | (1) Department of Materials, Imperial College London, South Kensington Campus, London, SW7 2AZ, UK; |
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Abstract: | Preliminary data were obtained on the immobilization of various heterovalent ions present in the two selected high-level nuclear
waste compositions. The entire set of ions present in the waste compositions were immobilized into sodium zirconium phosphate
(NZP) structure. The waste loading was in the range 5–25%. The two types of wasteforms loaded with the simulated high-level
waste compositions were characterized by powder X-ray diffraction, FT-IR, TGA/DTA, and scanning electron microscopy. The difference
in the compositions of the two simulated wastes was reflected in the waste loading percentage and the crystallization of the
wasteforms into NZP structure. Up to 12% waste loading, single phase isostructural with NZP was obtained as a major product
in the case of the first waste composition. An increase in the waste loading led to the segregation of ZrP2O7 as a secondary phase. With the second waste composition, an NZP-like phase was obtained as the major product even at 25%
waste loading. |
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Keywords: | |
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