Development of monazite glass-ceramic wasteforms for the immobilisation of pyroprocessing wastes
Development of monazite glass-ceramic wasteforms for the immobilisation of pyroprocessing wastes
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DOI：
10.1557/s43580-022-00230-5
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发表时间：
2022-03
期刊：
影响因子：
0.8
通讯作者：
D. Bailey;L. J. Gardner;M. Harrison;D. Mckendrick;N. Hyatt
中科院分区：
文献类型：
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作者：
D. Bailey;L. J. Gardner;M. Harrison;D. Mckendrick;N. Hyatt
高温化学后处理是对下一代反应堆燃料进行后处理的一种潜在途径。镧系元素裂变产物可通过多种方法从后处理盐中分离出来;然而，盐可能夹带在所得产物中。这项工作展示了基于四元（100−x）（10 Na 2 O-36 Fe 2 O3 - 54 P2 O 5）-xLa 2 O3（x = 5、10、15）的概念性独居石玻璃陶瓷废物形式，其中La 2 O3作为镧系氧化物废物流的替代物。样品通过用钠-铁-磷酸盐玻璃料熔融La 2 O3制备，并通过XRD和SEM-EDX表征。独居石相成功地形成在所有的废物负荷与La的结晶相的清晰的偏析;然而，高La 2 O3负载（>10摩尔%）被发现不稳定的玻璃系统，导致粗结晶。这些初步结果表明，独居石玻璃陶瓷是这一废物流的有前途的废物形式。
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)(10Na2O–36Fe2O3–54P2O5)–xLa2O3 (x = 5, 10, 15), with La2O3 as a surrogate for the lanthanide oxide waste stream. Samples were produced by the melting of La2O3 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 La2O3 loading (>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.