Densification study of sodium zirconium phosphate-type ceramic for immobilizing radionuclides of Sr prepared with microwave sintering from uranium tailing sand
Strontium zirconium phosphate (SrZr 4 (PO 4 ) 6 ) ceramics has high density and chemical inertness, which can safely and effectively immobilize the divalent fission product Sr in the ceramic matrix. In this study, a novel SrZr 4 (PO 4 ) 6 ceramic was synthesized using microwave sintering of uranium...
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Published in | Journal of radioanalytical and nuclear chemistry Vol. 333; no. 3; pp. 1275 - 1285 |
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Main Authors | , , , , , , , , , , |
Format | Journal Article |
Language | English |
Published |
Cham
Springer International Publishing
01.03.2024
Springer Nature B.V |
Subjects | |
Online Access | Get full text |
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Summary: | Strontium zirconium phosphate (SrZr
4
(PO
4
)
6
) ceramics has high density and chemical inertness, which can safely and effectively immobilize the divalent fission product Sr in the ceramic matrix. In this study, a novel SrZr
4
(PO
4
)
6
ceramic was synthesized using microwave sintering of uranium tailings. This method features shorter sintering times and efficient energy use. Sr replaces Na in sodium zirconium phosphate (NaZr
2
(PO
4
)
3
) due to similar ionic radii, transforming it into SrZr
4
(PO
4
)
6
ceramics. The results showed that the sintered samples prepared by holding at 1200 °C for 50 min, which the density of the solidified body reached up to 3.2 g/cm
3
.The ceramics showcase outstanding leach resistance, with Sr leaching rates far below the nuclear industry standard (1 × 10
−2
g m
−2
d
−1
). Similarly, the leaching rates for Na, Zr, P, and Si (10
–4
–10
–6
, 10
–6
–10
–8
, 10
–3
–10
–4
, and 10
–2
–10
−3
g m
−2
d
−1
) are significantly lower than industry standards. |
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ISSN: | 0236-5731 1588-2780 |
DOI: | 10.1007/s10967-024-09372-2 |