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Efficiency of fly ash belite cement and zeolite matrices for immobilizing cesium

AutorGoñi Elizalde, Sara; Guerrero Bustos, Ana María; Lorenzo García, M.ª Paz
Palabras claveFly ash belite cement
Diffusion
Cesium
Gismondine-type Na-P1 zeolite
Fecha de publicación2006
EditorElsevier
CitaciónJournal of Hazardous Materials B137 (2006) 1608–1617
ResumenThe efficiency of innovative matrices for immobilizing cesium is presented in this work. The matrix formulation included the use of fly ash belite cement (FABC-2-W) and gismondine-type Na-P1 zeolite, both of which are synthesized from fly ash of coal combustion. The efficiency for immobilizing cesium is evaluated from the leaching test ANSI/ANS 16.1-1986 at the temperature of 40ºC, from which the apparent diffusion coefficient of cesium is obtained. Matrices with 100% of FABC-2-W are used as a reference. The integrity of matrices is evaluated by porosity and pore-size distribution from mercury intrusion porosimetry, X-ray diffraction and nitrogen adsorption analyses. Both matrices can be classified as good solidify systems for cesium, specially the FABC-2-W/zeolite matrix in which the replacement of 50% of belite cement by the gismondinetype Na-P1 zeolite caused a decrease of two orders of magnitude of cesium mean Effective Diffusion Coefficient (De) (2.8e−09 cm2/s versus 2.2e−07 cm2/s, for FABC-2-W/zeolite and FABC-2-W matrices, respectively).
Descripción10 pages.-- Final full-text version of the paper available at: http://dx.doi.org/10.1016/j.jhazmat.2006.04.059.
URIhttp://hdl.handle.net/10261/4953
DOI10.1016/j.jhazmat.2006.04.059
ISSN0304-3894
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