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<p>Nuclear power plants use boric acid with different <sup>10</sup>B enrichment levels (from natural ratio to 90% <sup>10</sup>B) 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.</p>

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

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年2月5日

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  • 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

摘要

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.