高放处置罐铁释放诱发膨润土矿物相变研究进展
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P578.967;X771

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国家自然科学基金项目(41972265);河南省高等学校重点科研项目(21A410004);河南省住房城乡建设科技计划项目(HNJS-2020-K25)


A review on the study of mineral phase transformation of bentonite induced by iron release in the high-level radioactive waste repository
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    摘要:

    作为高放废物处置罐候选金属材料,低碳钢在处置库服役期间,其腐蚀产物侵入缓冲屏障,导致缓冲材料矿物相变与性能变异,威胁多重屏障体系的长期安全稳定。本文详细综述了国内外处置库深部还原环境所处的弱碱性化学场与中低温度场的变化趋势,认为处置库深部化学-温度还原条件可导致处置罐Fe腐蚀释放Fe2+。在处置库长期运行过程中,蒙脱石与Fe2+接触发生矿物相变,一方面Fe2+置换蒙脱石八面体晶格中的Al3+和Mg2+,还原Fe3+或直接占据空位,生成次生矿物;另一方面Fe2+交换蒙脱石层间的Na+、K+和Ca2+,转化为铁基蒙脱石。矿物相变可诱发缓冲屏障性能变异甚至退化。基于"抗矿物转化"理念,提出了下一阶段缓冲材料矿物相变研究方向,为地下实验室碳素钢选型、缓冲屏障验证试验设计以及屏障体系安全评价提供科学依据。

    Abstract:

    During the service of the high-level radioactive waste repository, low-carbon steel serves as a candidate metal material for the disposal tank, but iron corrosion products infiltrate into the buffer barrier, resulting in mineral phase transformation and performance variation, which threatens the long-term safety and stability of the multiple barrier system. This paper reviews the chemical and low-medium temperature field in the deep reduction environment of the repositories. It is believed that the above factors can cause the release of Fe2+ in the disposal tank. Fe2+ causes montmorillonite mineral phase transformation: Fe2+ replaces Al3+ and Mg2+ in the octahedral lattice of montmorillonite, reduces Fe3+ or directly occupies the vacancy to generate secondary minerals; Fe2+ exchanges Na+, K+ and Ca2+, converted to iron-based montmorillonite. Mineral phase transition can induce buffer barrier performance variation or even degradation. Based on the concept of "resisting mineral transformation", the research direction of the mineral phase transformation of the buffer material in the next stage is proposed, which provides a scientific basis for the selection of carbon steel in underground laboratories, the design of the verification test of the buffer barrier and the safety evaluation of the barrier system.

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张明,谢敬礼,2021,高放处置罐铁释放诱发膨润土矿物相变研究进展[J].岩石矿物学杂志,40(4):778~785.

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  • 收稿日期:2020-07-06
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  • 在线发布日期: 2021-07-16
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