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In-situ Formation of Bismuth-Based Iodine Waste Forms

Published online by Cambridge University Press:  01 February 2011

Tina Nenoff ,
James L. Krumhansl  and
Ashwath Rajan
Tina Nenoff
Affiliation:
tmnenof@sandia.gov, Sandia National Laboratories, Surface and Interface Science, PO Box 5800, MS 1415, Albuquerque, NM, 87185-1415, United States
James L. Krumhansl
Affiliation:
jlkrumh@sandia.gov, Sandia National Laboratories, Geochemistry, PO Box 5800, MS 0754, Albuquerque, NM, 87185-0754, United States
Ashwath Rajan
Affiliation:
arajan@sandia.gov, Sandia National Laboratories, Geochemistry, PO Box 5800, MS 0754, Albuquerque, NM, 87185-0754, United States
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Abstract

We investigated the synthesis of bismuth oxy-iodide and iodate compounds, in an effort to develop materials for iodine recovery from caustic waste streams and/or final waste disposal if repository conditions included ambient conditions similar to those under which the iodine was initially captured. The results presented involve the in-situ crystallization of layered bismuth oxide compounds with aqueous dissolved iodine (which resides as both iodide and iodate in solution). Although single-phase bismuth oxy-iodide materials have already been described in the context of capturing radioiodine, our unique contribution is the discovery that there is a mixture of Bi-O-I compositions, not described in the prior work, which optimize both the uptake and the degree of insolubility (and leachability) of iodine. The optimized combination produces a durable material that is suitable as a waste form for repository conditions such as are predicted at the Yucca Mountain repository (YMP) or in a similar type of repository that could be developed in coordination with iodine production via Global Nuclear Energy Program (GNEP) production cycles.

Keywords

waste managementIBi
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1043: Symposium T – Materials Innovations for Next-Generation Nuclear Energy , 2007 , 1043-T12-05
Copyright
Copyright © Materials Research Society 2008

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