Fabrication and physical properties of lanthanide oxide glass wasteform for the immobilization of lanthanide oxide wastes generated from pyrochemical process

The pyrochemical process, which uses a dry method to recycle used nuclear fuel generates waste LiCl–KCl salt containing radioactive lanthanide elements. To reuse LiCl–KCl salt, the lanthanide elements are separated through a precipitation method promoted by oxygen sparging and the separated fission...

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Bibliographic Details
Published in:Journal of radioanalytical and nuclear chemistry 2014-03, Vol.299 (3), p.1731-1738
Main Authors: Choi, Jung-Hoon, Cho, In-Hak, Eun, Hee-Chul, Park, Hwan-Seo, Cho, Yung-Zun, Lee, Ki-Rak, Park, Geun-Il, Kim, Song-Hyun, Shin, Chang-Ho, Kim, Jong-Kyung
Format: Article
Language:English
Subjects:
Chemistry
Chemistry and Materials Science
Diagnostic Radiology
Hadrons
Heavy Ions
Inorganic Chemistry
Nuclear Chemistry
Nuclear energy
Nuclear fuel cycle
Nuclear Physics
Physical Chemistry
Rain and rainfall
Rare earth metals
Waste management
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Summary:The pyrochemical process, which uses a dry method to recycle used nuclear fuel generates waste LiCl–KCl salt containing radioactive lanthanide elements. To reuse LiCl–KCl salt, the lanthanide elements are separated through a precipitation method promoted by oxygen sparging and the separated fission product of lanthanide oxide should be fabricated into durable wasteforms sustainable for several 1,000 years to store in a final geological repository. Herein, we report the fabrication of a borosilicate glass based wasteform with a glass matrix of SiO 2 –Al 2 O 3 –B 2 O 3 having a high waste loading of 50 wt% lanthanide oxide. Th physical properties of four kinds of wasteforms having a different lanthanide oxide waste composition were evaluated. To investigate the long-term physical stability of each sample having 50 wt% lanthanide oxide waste loading, time–temperature–transformation (TTT) test was conducted at 500 and 700 °C for 60 and 180 h, and the physical properties were evaluated after each TTT test.
ISSN:0236-5731
1588-2780
DOI:10.1007/s10967-013-2863-6