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    模拟高放废物深地质处置条件下Se在铁基材料上的氧化还原行为

    Redox Behavior of Se on Iron-Based Materials in Simulated Geological Disposal Environment of HLW

      摘要
    • 摘要: 以铁基材料（纯铁和304L不锈钢）和Na2SeO4/Na2SeO3溶液为研究对象，依托低氧手套箱，在常温、低氧条件下，采用静态批式法开展了Se（Ⅵ/Ⅳ）和铁基材料氧化还原作用研究，利用离子色谱法分析研究浸泡铁基材料的Na2SeO4溶液和Na2SeO3溶液浓度变化，运用扫描电子显微镜（SEM）、X射线能谱分析（EDS）和拉曼光谱（Raman）等技术，对反应前后铁基材料样品的表观形貌、元素分布、物相组成进行较为系统的物理-化学表征。结果表明，SeO2-4/SeO2-3在纯铁体系中的反应速率明显快于其在304L不锈钢体系中的反应速率；铁基材料还原SeO2-3的速率快于SeO2-4的。

       

      Abstract: In this paper, reduction-oxidation between Se and iron-based materials(pure iron and 304L stainless steel) was carried out in glove box under ambient temperature and low-oxygen. Using ion chromatography to analyse the concentration changes of sodium selenate solution and sodium selenite solution in which iron-based materials were immersed. The iron-based material samples before and after the reaction were analysed by scanning electron microscopy(SEM), energy dispersive spectrometer(EDS) and Raman spectrometry. The results show that the oxidation-reduction reaction rate of SeO2-4/SeO2-3 and pure iron is significantly faster than that of SeO2-4/SeO2-3 and 304L stainless steel; the reaction rate of ironbased materials and SeO2-3 is higher than that of iron-based materials and SeO2-4.

       

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