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Synthesis of Calcium Monouranate Particles via an Aqueous Route

Published online by Cambridge University Press:  16 February 2017

Weixuan Ding ,
Johannes A. Botha ,
Bruce C. Hanson  and
Ian T. Burke
Weixuan Ding*
Affiliation:
Institute of Particle Science and Engineering, School of Chemical and Process Engineering, University of Leeds, Leeds, LS2 9JT, UK
Johannes A. Botha
Affiliation:
Institute of Particle Science and Engineering, School of Chemical and Process Engineering, University of Leeds, Leeds, LS2 9JT, UK
Bruce C. Hanson
Affiliation:
Institute of Particle Science and Engineering, School of Chemical and Process Engineering, University of Leeds, Leeds, LS2 9JT, UK
Ian T. Burke
Affiliation:
School of Earth and Environment, University of Leeds, Leeds, LS2 9JT, UK
*
*(Email: [email protected])
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Abstract

Large stores of unstable waste uranic materials such as fluorides or nitrates exist internationally due to legacy civil nuclear enrichment activities. Conversion of these uranic materials to layered metal uranates prior to disposal is possible via aqueous quench - precipitation type reactions. Previous studies1 have shown facile in-situ formation of geologically persistent and labile uranate colloids2 under simulated nuclear waste repository conditions, though the effects of local solution metal-uranium ratios on uranate stoichiometry have yet to be covered. This affects our understanding of how key radionuclides present in repository porewaters such as strontium or caesium may be sequestered in these uranate structures. In this work, we demonstrate a synthesis reaction for calcium monouranate particles via rapid anhydrous curing of a sol-gel. We present some results showing aqueous nucleation of uranate nanoparticles and their phase transformations during thermal curing as well as the effects of solution phase calcium loading on uranate phase purity in the cured particles.

Keywords

chemical synthesissol-gelU
Type
Articles
Information
MRS Advances , Volume 1 , Issue 62: Scientific Basis for Nuclear Waste Management XXXIX , 2016 , pp. 4123 - 4129
Copyright
Copyright © Materials Research Society 2017 

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