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Zeolite - Salt Occlusion: A Potential Route for the Immobilisation of Iodine-129?

Published online by Cambridge University Press:  01 February 2011

Neil C. Hyatt ,
Joseph A. Hriljac ,
Alia Choudhry ,
Laura Malpass ,
Gareth P. Sheppard  and
Ewan R. Maddrell
Neil C. Hyatt
Affiliation:
Immobilisation Science Laboratory, Dept. of Engineering Materials, University of Sheffield, Mappin Street, Sheffield, S1 3JD., UK.
Joseph A. Hriljac
Affiliation:
School of Chemical Sciences, The University of Birmingham, Birmingham, B15 2TT., UK.
Alia Choudhry
Affiliation:
School of Chemical Sciences, The University of Birmingham, Birmingham, B15 2TT., UK.
Laura Malpass
Affiliation:
School of Chemical Sciences, The University of Birmingham, Birmingham, B15 2TT., UK.
Gareth P. Sheppard
Affiliation:
School of Chemical Sciences, The University of Birmingham, Birmingham, B15 2TT., UK.
Ewan R. Maddrell
Affiliation:
BNFL Technology Centre, Sellafield, Seascale, Cumbria, CA20 1PG., UK.
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Abstract

Reactions of zeolite Na-A with AgI, and the sodium, copper and lead forms of zeolites A, LTA, X and Y with NaI, have been examined as possible starting routes to the long term immobilisation of iodine-129. Heating the salts in air, at 500°C, with the sodium forms of the zeolites leads to the formation of occlusion products, where the iodide salt migrates into the zeolite pores. Detailed studies of the Na-A / 5AgI complex indicate it has a uniform distribution of Na, Si, Al, Ag and I, and is thermally stable to ca. 750°C, where there is a substantial weight loss as iodine is released. In situ powder X-ray diffraction studies have been used to monitor the occlusion reaction at 400°C, and show that the occlusion product decomposes to produce a single crystalline phase at 800°C prior to further decomposition at 850°C to a mixture of nepheline and elemental silver.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 807: Symposium Scientific Basis for Nuclear Waste Management XXVII , 2003 , 359
Copyright
Copyright © Materials Research Society 2004

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References

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