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Published on: October 28, 2022
Rapid Immobilization of Simulated Radioactive Soil Waste Using Self-Propagating Synthesized Gd₂Ti₂O₇ Pyrochlore
Jiali Xue1, Kuibao Zhang2,3, Zongsheng He4
1State Key Laboratory of Environment-friendly Energy Materials, Southwest University of Science and Technology, Mianyang 621010, China. xuejiali0304@163.com.
Abstract:
A rapid and effective method is necessary in the disposal of severely radioactive contaminated soil waste. Simulated Ce-bearing radioactive soil waste was immobilized by self-propagating high-temperature synthesis (SHS) within 5 min in this study. The main work includes the rapid synthesis of soil waste forms, the analysis of phase composition, microstructure and chemical durability. These results show that the simulated nuclide Ce was successfully immobilized into the pyrochlore-rich waste matrice, whose main phases are SiO₂, pyrochlore (Gd₂Ti₂O₇) and Cu. The normalized leaching rates of Si and Na on the 42nd day are 1.86 × 10-3 and 1.63 × 10-2 g·m-2·d-1, respectively. And the normalized leaching rate of Ce also remains at low level (10-5-10-6 g·m-2·d-1) within 42 days.
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