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首页> 外文期刊>Journal of Nuclear Materials: Materials Aspects of Fission and Fusion >B2O3 -assisted low-temperature crystallization of pollucite structures and their potential applications in Cs+ immobilization
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B2O3 -assisted low-temperature crystallization of pollucite structures and their potential applications in Cs+ immobilization

机译：B2O3 - 散硅结构的低温结晶及其在CS +固定中的潜在应用

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摘要

Pollucite structures present remarkable chemical stability and good corrosion resistance against the leaching medium, which renders them promising for the permanent disposal of radioactive Cs-137. However, it is still challenging to prepare pollucite with dense structures and high immobilization performance at low temperature so far. Additionally, the fundamental understanding of the mechanism underlying the leaching behaviors of Cs+ from pollucite remains largely unexplored. In this paper, we realize the low-temperature production of pollucite by tailoring the nature of geopolymer precursors and employing B2O3 additives. It has been shown that the introduction of B2O3 not only significantly reduces the crystallization temperature of pollucite, but also improves the immobilization performance of Cs through encapsulation effect. Differential scanning calorimetry and X-ray diffraction confirm the formation of crystalline pollucite from amorphous geopolymer at similar to 700 degrees C in the presence of 7.5 wt% B2O3. By further increasing the treatment temperature to 1000 degrees C, pollucite grains can be well-encapsulated by glass phase, exhibiting leaching rates similar to 2 order lower than their unencapsulated counterparts. Moreover, distinct leaching mechanisms that govern the leaching behaviors of Cs+ from specimens being treated at different temperatures are unveiled. We anticipate that the proposed scheme facilitates the low-temperature production of high-quality pollucite structures with promising applications in the immobilization of hazardous wastes. (C) 2020 Elsevier B.V. All rights reserved.
机译：散布型结构具有显着的化学稳定性和对浸出介质的良好耐腐蚀性，这使它们呈现出对放射性CS-137的永久处置的承诺。然而，到目前为止，在低温下，在低温下准备散热性和高固定性能仍然挑战。此外，对来自散布条件的浸出行为的机制的基本理解仍然很大程度上是未开发的。在本文中，我们通过剪裁地缘聚合物前体的性质和使用B2O3添加剂来实现甘石的低温生产。已经表明，B2O3的引入不仅显着降低了甘氨酸的结晶温度，而且还通过封装效果改善了Cs的固定性能。差分扫描量热法和X射线衍射确认在7.5wt％B2O3存在下从类似于700℃的无定形地质聚合物形成结晶氧化力的形成。通过进一步将处理温度进一步提高到1000℃，可以通过玻璃相封装甘氨酸颗粒，表现出与其未封装的对应物低2阶的浸出速率。此外，从不同温度下处理的样品中浸出CS +的浸出行为的不同浸出机制。我们预计该方案促进了高质量散石结构的低温生产，并在固定危险废物中的应用中具有有前途的应用。 （c）2020 Elsevier B.v.保留所有权利。

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  • 作者

    He Peigang; Fu Shuai; Wang Meng; Duan Xiaoming; Wang Qikun; Li Daxin; Yang Zhihua; Jia Dechang; Zhou Yu;

  • 作者单位

    Harbin Inst Technol Inst Adv Ceram Sch Mat Sci &

    Engn Harbin 150001 Peoples R China;

    Harbin Inst Technol Inst Adv Ceram Sch Mat Sci &

    Engn Harbin 150001 Peoples R China;

    Harbin Inst Technol Inst Adv Ceram Sch Mat Sci &

    Engn Harbin 150001 Peoples R China;

    Harbin Inst Technol Inst Adv Ceram Sch Mat Sci &

    Engn Harbin 150001 Peoples R China;

    Harbin Inst Technol Inst Adv Ceram Sch Mat Sci &

    Engn Harbin 150001 Peoples R China;

    Harbin Inst Technol Inst Adv Ceram Sch Mat Sci &

    Engn Harbin 150001 Peoples R China;

    Harbin Inst Technol Inst Adv Ceram Sch Mat Sci &

    Engn Harbin 150001 Peoples R China;

    Harbin Inst Technol Inst Adv Ceram Sch Mat Sci &

    Engn Harbin 150001 Peoples R China;

    Harbin Inst Technol Inst Adv Ceram Sch Mat Sci &

    Engn Harbin 150001 Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 原子能技术;
  • 关键词

    Geopolymer; Pollucite; Encapsulation; Leaching;

    机译：地质聚合物;散布物;封装;浸出;

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