Further development of iodine immobilization technique by low temperature vitrification with BiPbO 2I

Atsushi Mukunoki, Tamotsu Chiba, Yasuhiro Suzuki, Kenji Yamaguchi, Tomofumi Sakuragi, Tokuro Nanba

Research output: Chapter in Book/Report/Conference proceedingConference contribution

5 Citations (Scopus)

Abstract

The authors describe progress in the development of low temperature vitrification with BiPbO 2I (BPI) as a promising immobilization technique by which Iodine-129 is recovered by BiPbO 2NO 3 to form BPI, and then solidified into a lead-boron-zinc glass matrix (PbO-B 2O 3-ZnO) using a low temperature vitrification process. The microscopic structure of BPI glass was analyzed by various analytical techniques, such as XRD (X-ray diffraction), NMR (nuclear magnetic resonance analysis), and XPS (X-ray photoelectron spectroscopy), using several types of glass samples. The results obtained provide structural information on key elements in BPI glass and can be applied for modeling the structure of the BPI glass, simulated by molecular dynamics. The previous work suggested that the leaching behavior of iodine from BPI glass depended upon the chemical conditions of the solution. Further leaching tests using solutions under varying conditions were carried out in order to predict mechanisms of iodine leaching. Normalized elemental mass loss values of iodine in simulated seawater and bentonite pore water are almost the same as those of boron, showing that iodine dissolves congruently with BPI glass, whereas iodine dissolves incongruently in Ca(OH) 2 solutions of pH 9 and 11. To demonstrate the feasibility of the BPI vitrification process, recovery tests of iodine from spent iodine filters were conducted and a prototype melting furnace was developed for scale-up tests of glass sample. It was found that more than 95% of iodine can be recovered from the spent iodine filter and that the prototype furnace can produce approximately 0.5 liters of homogeneous glass.

Original languageEnglish
Title of host publicationProceedings of the International Conference on Radioactive Waste Management and Environmental Remediation, ICEM
Pages329-334
Number of pages6
Volume1
Publication statusPublished - 2009
EventASME 2009 12th International Conference on Environmental Remediation and Radioactive Waste Management, ICEM2009 - Liverpool, United Kingdom
Duration: Oct 11 2009Oct 15 2009

Other

OtherASME 2009 12th International Conference on Environmental Remediation and Radioactive Waste Management, ICEM2009
CountryUnited Kingdom
CityLiverpool
Period10/11/0910/15/09

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ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Safety, Risk, Reliability and Quality
  • Waste Management and Disposal

Cite this

Mukunoki, A., Chiba, T., Suzuki, Y., Yamaguchi, K., Sakuragi, T., & Nanba, T. (2009). Further development of iodine immobilization technique by low temperature vitrification with BiPbO 2I. In Proceedings of the International Conference on Radioactive Waste Management and Environmental Remediation, ICEM (Vol. 1, pp. 329-334)