Journal of Nuclear Fuel Cycle and Waste Technology(JNFCWT) (방사성폐기물학회지)

Korean Radioactive Waste Society (한국방사성폐기물학회)
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Chemical and Mechanical Sustainability of Silver Tellurite Glass Containing Radioactive Iodine-129

  • Lee, Cheong Won (Pohang University of Science and Technology (POSTECH)) ;
  • Kang, Jaehyuk (Pohang University of Science and Technology (POSTECH)) ;
  • Kwon, Yong Kon (Pohang University of Science and Technology (POSTECH)) ;
  • Um, Wooyong (Pohang University of Science and Technology (POSTECH)) ;
  • Heo, Jong (Pohang University of Science and Technology (POSTECH))
  • Received : 2021.07.06
  • Accepted : 2021.08.10
  • Published : 2021.09.30
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Abstract

Silver tellurite glasses with melting temperature of approximately 700℃ were developed to immobilize 129I wastes. Long-term dissolution tests in 0.1 M acetic acid and disposability assessment were conducted to evaluate sustainability of the glasses. Leaching rate of Te, Bi and I from the glasses decreased for up to 16 d, then remained stable afterwards. On the contrary, tens to tens of thousands of times more of Ag was leached in comparison to the other elements; additionally, Ag leached continuously for all 128 d of the test owing to the exchange of Ag+ and H+ ions between the glasses and solution. The I leached much lower than those of other elements even though it leached ~10 times more in 0.1 M acetic acid than in deionized water. Some TeO4 units in the glass network were transformed to TeO3 by ion exchange and hydrolysis. These silver tellurite glasses met all waste acceptance criteria for disposal in Korea.

Keywords

Acknowledgement

This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT & Future Planning (NRF-2019M2A7A1001811).

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