Densification of non-radioactive porous siliceous particles loaded with cesium potassium copper hexacyanoferrate by spark plasma sintering

In the development of a conditioning process for cesium-bearing sorbents from the decontamination of aqueous waste streams, the treatment of a granular material composed of (Cs,K)2CuFe(CN)6 loaded onto mesoporous silica particles has been investigated in an additive-free two-step conditioning proces...

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Bibliographic Details
Published in:Journal of the European Ceramic Society 2020-10, Vol.41 (2)
Main Authors: Massoni, Nicolas, Le Gallet, Sophie, Campayo, Lionel, Koch, Robert J., Misture, Scott T., Grandjean, Agnès, Bernard, Frédéric
Format: Article
Language:English
Subjects:
Alkali silicate glass
Cesium
Decontamination
Hexacyanoferrate
MATERIALS SCIENCE
Silica
Spark plasma sintering
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Summary:In the development of a conditioning process for cesium-bearing sorbents from the decontamination of aqueous waste streams, the treatment of a granular material composed of (Cs,K)2CuFe(CN)6 loaded onto mesoporous silica particles has been investigated in an additive-free two-step conditioning process involving (i) calcination at 1000 °C to remove volatile species and (ii) densification by spark plasma sintering. A 92.0 % dense pellet was obtained after 10 min sintering at 850 °C under 100 MPa. Density and microstructural measurements indicate that densification is first driven by the viscous flow of a vitreous phase containing Cs, formed during calcination. Additionally, the density of the sample then increases further during sintering by grain boundary diffusion. However, a limited but non negligible part of cesium is lost during densification.
ISSN:0955-2219
1873-619X