超临界水热合成放射性熔盐废物中铯的快速固定化

IF 3.5 3区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Journal of the American Ceramic Society Pub Date : 2025-03-20 DOI:10.1111/jace.20511

Maobiao Ran, Xiaoliang Gou, Shunzhang Chen, Xiaoyan Shu, Yi Liu, Shengdong Zhang, Xirui Lu

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引用次数: 0

摘要

为了快速解决放射性熔盐废物中Cs的存在，我们使用非放射性CsCl来模拟137CsCl。偏高岭土经超临界水热合成，在10 min内转化为偏高岭土和钠石。当Cs/Al和Si/Al的摩尔比分别为0.4和2.0时，凝固形态的初相以偏高岭土为主，CsCl溶解度达到25.52 wt.%。所有元素在凝固形态内均匀分布。此外，超临界水热合成不仅有助于CsCl的固定化，而且提高了固化形态的化学稳定性。28 d后Cs的归一化浸出率小于4.03 × 10−6 g m−2 day−1，远低于现有固化基质。这项研究提出了一种快速处置放射性熔盐废物的新方法。

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Rapid immobilization of cesium in radioactive molten salt waste via supercritical water hydrothermal synthesis

To swiftly address Cs presence in radioactive molten salt waste, we utilized nonradioactive CsCl to simulate ¹³⁷CsCl. Through supercritical water hydrothermal synthesis with metakaolin, we converted it to pollucite and sodalite within 10 min. With Cs/Al and Si/Al mole ratios set at 0.4 and 2.0, respectively, the primary phase in the solidified form was predominantly pollucite, with CsCl solubility reaching 25.52 wt.%. All elements were uniformly distributed within the solidified form. Additionally, the supercritical water hydrothermal synthesis not only aided CsCl immobilization but also improved the chemical stability of the solidified form. The normalized leaching rate of Cs after 28 days is less than 4.03 × 10⁻⁶ g m⁻² day⁻¹, which is much lower than the existing solidification substrate. This investigation presents a fresh approach to the rapid disposal of radioactive molten salt waste.

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来源期刊

Journal of the American Ceramic Society 工程技术-材料科学：硅酸盐

CiteScore

7.50

自引率

7.70%

发文量

590

审稿时长

2.1 months

期刊介绍： The Journal of the American Ceramic Society contains records of original research that provide insight into or describe the science of ceramic and glass materials and composites based on ceramics and glasses. These papers include reports on discovery, characterization, and analysis of new inorganic, non-metallic materials; synthesis methods; phase relationships; processing approaches; microstructure-property relationships; and functionalities. Of great interest are works that support understanding founded on fundamental principles using experimental, theoretical, or computational methods or combinations of those approaches. All the published papers must be of enduring value and relevant to the science of ceramics and glasses or composites based on those materials. Papers on fundamental ceramic and glass science are welcome including those in the following areas: Enabling materials for grand challenges[...] Materials design, selection, synthesis and processing methods[...] Characterization of compositions, structures, defects, and properties along with new methods [...] Mechanisms, Theory, Modeling, and Simulation[...] JACerS accepts submissions of full-length Articles reporting original research, in-depth Feature Articles, Reviews of the state-of-the-art with compelling analysis, and Rapid Communications which are short papers with sufficient novelty or impact to justify swift publication.