Immobilization of cesium in alkaline activated fly ash matrix

Immobilization of cesium in alkaline activated fly ash matrix

The immobilization potential of alkaline activated fly ash (AAFA) matrices for cesium has been investigated. The presence of Cs in the AAFA pastes, prepared using 8M NaOH solution as activator, showed no significant adverse effects on mechanical strength or microstructure, nor were significant quant...

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Veröffentlicht in:Journal of nuclear materials 2005-11, Vol.346 (2), p.185-193
Hauptverfasser: Fernandez-Jimenez, A., Macphee, D.E., Lachowski, E.E., Palomo, A.
Format: Artikel
Sprache:eng
Schlagworte:
Applied sciences
Controled nuclear fusion plants
Energy
Energy. Thermal use of fuels
Exact sciences and technology
Fission nuclear power plants
Fuels
Installations for energy generation and conversion: thermal and electrical energy
Nuclear fuels
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Zusammenfassung:The immobilization potential of alkaline activated fly ash (AAFA) matrices for cesium has been investigated. The presence of Cs in the AAFA pastes, prepared using 8M NaOH solution as activator, showed no significant adverse effects on mechanical strength or microstructure, nor were significant quantities of Cs leached following application of the Toxic Characteristic Leaching Procedure (TCLP) and American Nuclear Society (ANS) 16.1 leaching protocols. Microstructural analysis shows Cs associated with the main reaction product in the AAFA suggesting that cesium is chemically bound rather than physically encapsulated. It is proposed that cesium is incorporated into the alkaline aluminosilicate gel, a precursor for zeolite formation.
ISSN:0022-3115
1873-4820
DOI:10.1016/j.jnucmat.2005.06.006