Densification of non-radioactive porous siliceous particles loaded with cesium potassium copper hexacyanoferrate by spark plasma sintering. Issue 2 (February 2021)

• Record Type: Journal Article
• Authors: Massoni, Nicolas; Le Gallet, Sophie; Campayo, Lionel; Koch, Robert J.; Misture, Scott T.; Grandjean, Agnès; Bernard, Frédéric
• Is Part Of: Journal of the European Ceramic Society. Volume 41:Issue 2(2021)
• Page Start: 1506
• Page End: 1513
• Publication Date: 2021-02
• Subjects: Hexacyanoferrate -- Decontamination -- Cesium -- Spark plasma sintering -- Silica -- Alkali silicate glass; Ceramic materials -- Periodicals; Composite materials -- Periodicals; Matériaux céramiques -- Périodiques; Composites -- Périodiques; Ceramic materials; Composite materials; Periodicals; Electronic journals; 666.05
• DOI: 10.1016/j.jeurceramsoc.2020.10.024
• Languages: English
• ISSNs: 0955-2219

Abstract

Abstract: 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)2 CuFe(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. 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.