Leachability and Thermal Properties of Ceramic Solid Forms Immobilizing Cesium and/or Strontium

Hitoshi Mimura, Teppei Hirabayashi, Masaki Ozawa

Research output: Contribution to conferencePaper

Abstract

Solid forms immobilizing nuclides were prepared from Cs-mordenite and Sr-A zeolite by calcination at 1,200°C for 1 h. Cesium and strontium were fixed in the crystal phases of pollucite (CsAlSi2O6) and Sr-feldspar (SrAl2Si2O8), respectively. The leachability of Cs and Sr was rather high in 0.1 M HNO3 leachant, while the leached percentage was lowered in 0.1 M NaOH, 0.1 M NaCl and deionized water. The recrystallized phases formed on the surface after leaching in 0.1 M NaOH resulted in the lowering of the leachability of Cs and Sr. The thermal conductivities (k) of solid forms of Cs-MOR, Sr-A, (Cs,Sr)-A and Al-matrix (calcined Cs-mordenite dispersed in Al metal matrix) were determined to be 0.83-1.00, 0.55-0.64, 0.83-1.01 and 47 W/(m·K), respectively. The central temperature of solid forms with the same diameter was in the order of Sr-A > Cs-MOR > Al-matrix.

Original languageEnglish
Pages615-622
Number of pages8
Publication statusPublished - 2003 Dec 1
EventInternational Conference - Nuclear Energy for New Europe 2003, Proceedings - Portoroz, Slovenia
Duration: 2003 Sep 82003 Sep 11

Other

OtherInternational Conference - Nuclear Energy for New Europe 2003, Proceedings
CountrySlovenia
CityPortoroz
Period03/9/803/9/11

ASJC Scopus subject areas

  • Nuclear Energy and Engineering

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    Mimura, H., Hirabayashi, T., & Ozawa, M. (2003). Leachability and Thermal Properties of Ceramic Solid Forms Immobilizing Cesium and/or Strontium. 615-622. Paper presented at International Conference - Nuclear Energy for New Europe 2003, Proceedings, Portoroz, Slovenia.