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

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• 作者：Jung-Hoon Choi (1)
  In-Hak Cho (1)
  Hee-Chul Eun (1)
  Hwan-Seo Park (1)
  Yung-Zun Cho (1)
  Ki-Rak Lee (1)
  Geun-Il Park (1)
  Song-Hyun Kim (2)
  Chang-Ho Shin (2)
  Jong-Kyung Kim (2)
  
• 关键词：Pyrochemical process ; LiCl–KCl eutectic waste salt ; Lanthanide oxide fission product ; Glass wasteform ; Vitrification
• 刊名：Journal of Radioanalytical and Nuclear Chemistry
• 出版年：2014
• 出版时间：March 2014
• 年：2014
• 卷：299
• 期：3
• 页码：1731-1738
• 全文大小：959 KB
• 作者单位：Jung-Hoon Choi (1)
  In-Hak Cho (1)
  Hee-Chul Eun (1)
  Hwan-Seo Park (1)
  Yung-Zun Cho (1)
  Ki-Rak Lee (1)
  Geun-Il Park (1)
  Song-Hyun Kim (2)
  Chang-Ho Shin (2)
  Jong-Kyung Kim (2)
  
  1. Nuclear Fuel Cycle Waste Treatment Research Division, Korea Atomic Energy Research Institute, Yuseong, Daejeon, 305-353, Korea
  2. Department of Nuclear Engineering, Hanyang University, 222 Wangsimni-ro, Seongdong, Seoul, 133-791, Korea
  
• ISSN：1588-2780

文摘

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 SiO2–Al2O3–B2O3 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.