Reactive spark plasma sintering of Cs-exchanged chabazite: characterisation and durability assessment for Fukushima Daiichi NPP clean-up
Reactive spark plasma sintering of Cs-exchanged chabazite: characterisation and durability assessment for Fukushima Daiichi NPP clean-up
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DOI：
10.1080/00223131.2019.1602484
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发表时间：
2019-04-14
影响因子：
1.2
通讯作者：
Hyatt, Neil C.
中科院分区：
文献类型：
--
作者：
Harnett, Liam C.;Gardner, Laura J.;Hyatt, Neil C.
离子特异性介质（ISM）通过处理受污染的废水，在福岛第一核电站的清理和补救工作中发挥了不可或缺的作用。这些材料的使用产生了二次核废料流，由于严格的处理和长期储存要求，产生了一系列的工程问题。研究了反应放电等离子烧结（SPS）法对废铯交换沸石、查巴氏石进行处理。天然形式的沸石被用作福岛核电站现场使用的工程ISM的类似物。模拟废物在不同温度和压力参数下烧结，然后分析相组合、密度和耐久性（使用产品一致性测试（PCT））。结果表明，沸石结构完全坍塌，交换的铯主要被分割成耐用的长石，以保证烧结材料的稳定性，可以被动安全储存或地质处置。
Ion-specific media (ISM) have played an integral role in the clean-up and remediation efforts at the Fukushima Dai-ichi disaster site, through the processing of contaminated wastewaters. The use of these materials generates a secondary nuclear waste stream, presenting its own series of engineering problems arising from stringent handling and long-term storage requirements. A reactive spark plasma sintering (SPS) method was investigated for conditioning of the spent cesium exchanged zeolite, chabazite. A natural form of the zeolite was used as an analogue to the engineered ISM used at the Fukushima NPP site. Simulant wasteforms were sintered using different temperature and pressure parameters followed by analysis of phase assemblage, density, and durability (using the product consistency test (PCT)). The results indicated that zeolite structure had collapsed completely, with the exchanged cesium partitioned primarily into a durable feldspar to assure stability of the sintered material for passively safe storage or geological disposal.