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Separation of Lanthanoid Phosphates From the Spent Electrolyte of Pyroprocessing

[+] Author Affiliations
Ippei Amamoto, Hirohide Kofuji, Munetaka Myochin

Japan Atomic Energy Agency, Tokai, Ibaraki, Japan

Tatsuya Tsuzuki

Central Glass Co., Ltd., Matsuzaka, Mie, Japan

Yasushi Takasaki

Akita University, Akita, Akita, Japan

Tetsuji Yano

Tokyo Institute of Technology, Tokyo, Japan

Takayuki Terai

The University of Tokyo, Tokyo, Japan

Paper No. ICEM2009-16265, pp. 705-713; 9 pages
doi:10.1115/ICEM2009-16265
From:
  • ASME 2009 12th International Conference on Environmental Remediation and Radioactive Waste Management
  • ASME 2009 12th International Conference on Environmental Remediation and Radioactive Waste Management, Volume 1
  • Liverpool, UK, October 11–15, 2009
  • Conference Sponsors: Nuclear Engineering Division and Environmental Engineering Division
  • ISBN: 978-0-7918-4407-6 | eISBN: 978-0-7918-3865-X
  • Copyright © 2009 by ASME

abstract

This study is carried out to make the pyroprocessing hold a competitive advantage from the viewpoint of environmental load reduction and economical improvement. As one of the measures is to reduce the volume of the high-level radioactive waste, the phosphate conversion method is applied for removal of fission products from the melt as spent electrolyte in this paper. Though the removing target elements in the medium are alkali metals, alkaline earth metals and lanthanoid elements, only lanthanoid elements and lithium form the insoluble phosphates by reaction with Li3 PO4 or K3 PO4 . Therefore, as the first step, the precipitation experiment was carried out to observe the behaviours of elements which form the insoluble precipitates as double salts other than simple salts. Then the filtration was experimented to remove lanthanoid precipitates in the spent electrolyte using Fe2 O3 -P2 O5 glass system as a filtlation medium which is compatible material with the glassification. The result of separation of lanthanoid precipitates by filtration was effective and attained almost 100%.

Copyright © 2009 by ASME

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