Nuclear Engineering and Technology

Korean Nuclear Society (한국원자력학회)
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Permanent disposal of Cs ions in the form of dense pollucite ceramics having low thermal expansion coefficient

  • Omerasevic, Mia (University of Belgrade, Vinca Institute of Nuclear Sciences, Department of Materials Science) ;
  • Lukic, Miodrag (Institute of Technical Sciences of the Serbian Academy of Sciences and Arts) ;
  • Savic-Bisercic, Marjetka (University of Belgrade, Vinca Institute of Nuclear Sciences, Chemical Dynamics Laboratory) ;
  • Savic, Andrija (University of Belgrade, Institute for Multidisciplinary Research) ;
  • Matovic, Ljiljana (University of Belgrade, Vinca Institute of Nuclear Sciences, Department of Materials Science) ;
  • Bascarevic, Zvezdana (University of Belgrade, Institute for Multidisciplinary Research) ;
  • Bucevac, Dusan (University of Belgrade, Vinca Institute of Nuclear Sciences, Department of Materials Science)
  • Received : 2018.12.25
  • Accepted : 2019.07.01
  • Published : 2020.01.25
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Abstract

A promising method for removal of Cs ions from water and their incorporation into stable crystal structure ready for safe and permanent disposal was described. Cs-exchanged X zeolite was hot-pressed at temperature ranging from 800 to 950 ℃ to fabricate dense pollucite ceramics. It was found that the application of external pressure reduced the pollucite formation temperature. The effect of sintering temperature on density, phase composition and mechanical properties was investigated. The highest density of 92.5 %TD and the highest compressive strength of 79 MPa were measured in pollucite hot-pressed at 950 ℃ for 3 h. Heterogeneity of samples obtained at 950 ℃ was determined using scanning electron microscopy. The pollucite hot-pressed at 950 ℃ had low linear thermal expansion coefficient of ~4.67 × 10-6 K-1 in the temperature range from 100 to 1000 ℃.

Keywords

References

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