Optimized cement blend for the immobilization of simulated borate radioactive liquid waste

IF 1.5 3区化学 Q3 CHEMISTRY, ANALYTICAL

Journal of Radioanalytical and Nuclear Chemistry Pub Date : 2025-02-05 DOI:10.1007/s10967-024-09957-x

Gabriel Iklaga, Mojtaba Rostamiparsa, István Tolnai, Nándor Kaposy, Katalin Gméling, Emese Csipa, Csaba Tóbi, Viktória Gável, Péter Kónya, Csaba Szabó, Margit Fábián, Zsuzsanna Szabó-Krausz, Péter Völgyesi

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Abstract

Nuclear power plants use boric acid with different ¹⁰B enrichment levels (from natural ratio to 90% ¹⁰B) as neutron absorber and at the end this constitutes a high-volume liquid waste. In this study, we aimed to find the optimal ratio of Portland cement and sulfoaluminate cement blend to improve the mechanical and chemical durability of final waste forms for borate immobilization. The standardized ASTM C1308-21 leaching test experimental method in combination with several analytical methods i.e. mechanical test, SEM, XRD, PGAA, ICP-OES, and ICP-MS were used to measure the boron elemental and isotopic leachability and its microstructural effect on the cement hydration characteristics of progressively increasing blend ratios of sulfoaluminate cement in Portland cement. The results indicated that the blend ratio of 20% sulfoaluminate cement to 80% Portland cement showed the best physical stability and lowest boron isotopic leachability from the final waste form.

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用于固定模拟硼酸盐放射性废液的优化水泥混合料

核电站使用不同浓度的硼酸（从自然浓度到90%）作为中子吸收剂，最终形成大容量的液体废物。在本研究中，我们旨在找到波特兰水泥和硫铝酸盐水泥混合料的最佳比例，以提高硼酸盐固定最终废物形态的机械和化学耐久性。采用标准化的ASTM C1308-21浸出试验实验方法，结合力学试验、SEM、XRD、PGAA、ICP-OES、ICP-MS等多种分析方法，测定了硫铝酸盐水泥在硅酸盐水泥中逐渐增加掺比时，硼元素和同位素的浸出率及其微观结构对水泥水化特性的影响。结果表明：20%硫铝酸盐水泥与80%硅酸盐水泥的掺量表现出最佳的物理稳定性和最低的硼同位素浸出率。

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来源期刊

Journal of Radioanalytical and Nuclear Chemistry 化学-分析化学

CiteScore

2.80

自引率

18.80%

发文量

504

审稿时长

2.2 months

期刊介绍： An international periodical publishing original papers, letters, review papers and short communications on nuclear chemistry. The subjects covered include: Nuclear chemistry, Radiochemistry, Radiation chemistry, Radiobiological chemistry, Environmental radiochemistry, Production and control of radioisotopes and labelled compounds, Nuclear power plant chemistry, Nuclear fuel chemistry, Radioanalytical chemistry, Radiation detection and measurement, Nuclear instrumentation and automation, etc.