锆石基质固定化稀土-锕系元素废物

IF 2.7 Q1 MATERIALS SCIENCE, CERAMICS Ceramics-Switzerland Pub Date : 2023-07-15 DOI:10.3390/ceramics6030098
S. Yudintsev, M. Nickolsky, M. I. Ojovan, O. I. Stefanovsky, V. Malkovsky, A. S. Ulanova, L. R. Blackburn
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引用次数: 0

摘要

考虑了锆石(理想情况下为CaZrTi2O7)作为分离的富含REE–锕系元素废物的主相的结构和化学性质。对天然和合成锆石结构相的详细分析证实,根据来源、晶体化学和/或合成路线,可以获得锆石多型结构的选择。通过冷压和烧结(CPS)、热等静压(HIP)等压力辅助烧结技术或熔融结晶路线,在工业规模上生产锆石陶瓷和玻璃-陶瓷复合材料似乎是最可行的。此外,我们还讨论了在与深井处理(DBD)相关的温度升高的条件下,通过含锕系元素的B–Si–Ca–Zr–Ti玻璃的结晶来合成锆石微晶玻璃。
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Zirconolite Matrices for the Immobilization of REE–Actinide Wastes
The structural and chemical properties of zirconolite (ideally CaZrTi2O7) as a host phase for separated REE–actinide-rich wastes are considered. Detailed analysis of both natural and synthetic zirconolite-structured phases confirms that a selection of zirconolite polytype structures may be obtained, determined by the provenance, crystal chemistry, and/or synthesis route. The production of zirconolite ceramic and glass–ceramic composites at an industrial scale appears most feasible by cold pressing and sintering (CPS), pressure-assisted sintering techniques such as hot isostatic pressing (HIP), or a melt crystallization route. Moreover, we discuss the synthesis of zirconolite glass ceramics by the crystallization of B–Si–Ca–Zr–Ti glasses containing actinides in conditions of increased temperatures relevant to deep borehole disposal (DBD).
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来源期刊
CiteScore
3.00
自引率
7.10%
发文量
66
审稿时长
10 weeks
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