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<p>The management of Sr-90, a long-lived fission product with high mobility and radiotoxicity, poses significant challenges for nuclear waste disposal. This study investigates reactive spark plasma sintering (R-SPS) of kaolin and strontium carbonate mixtures for effective Sr-90 immobilization. The R-SPS process at 1000&#xa0;°C enables formation of stable ceramic matrices incorporating strontium into SrAl<sub>2</sub>Si<sub>2</sub>O<sub>8</sub> and Sr<sub>2</sub>Al<sub>2</sub>SiO<sub>7</sub> crystalline phases. XRD, SEM, and TG/DTA analysis confirmed homogeneous matrices with uniform strontium distribution and dense microstructure. Leaching tests showed a Sr<sup>2+</sup> migration rate of 1.79 × 10<sup>−5</sup>&#xa0;g·cm<sup>−2</sup>·day<sup>−1</sup>, indicating good chemical durability. The results suggest that kaolin-based ceramic matrices produced via R-SPS offer a promising approach for safe Sr-90 immobilization with reduced waste volumes and improved handling safety.</p>

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Reactive spark plasma sintering of raw kaolin ceramic for 90Sr immobilization

  • 期刊论文

  • 发表日期：

    2026年1月8日

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  • O. O. Shichalin,
  • A. A. Belov,
  • N. P. Ivanov,
  • E. S. Kolodeznikov,
  • Ya. G. Zernov,
  • V. V. Provatorova,
  • A. N. Fedorets,
  • I. Yu. Buravlev,
  • A. I. Ivanets,
  • E. K. Papynov,
  • I. G. Tananaev

摘要

The management of Sr-90, a long-lived fission product with high mobility and radiotoxicity, poses significant challenges for nuclear waste disposal. This study investigates reactive spark plasma sintering (R-SPS) of kaolin and strontium carbonate mixtures for effective Sr-90 immobilization. The R-SPS process at 1000 °C enables formation of stable ceramic matrices incorporating strontium into SrAl2Si2O8 and Sr2Al2SiO7 crystalline phases. XRD, SEM, and TG/DTA analysis confirmed homogeneous matrices with uniform strontium distribution and dense microstructure. Leaching tests showed a Sr2+ migration rate of 1.79 × 10−5 g·cm−2·day−1, indicating good chemical durability. The results suggest that kaolin-based ceramic matrices produced via R-SPS offer a promising approach for safe Sr-90 immobilization with reduced waste volumes and improved handling safety.