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Dissolution of a Nuclear Waste Ceramic: An Experimental and Modeling Study
Author(s) -
RYERSON F. J.,
BAZAN F.,
CAMPBELL J. H.
Publication year - 1983
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1983.tb10082.x
Subject(s) - dissolution , spinel , ceramic , materials science , radioactive waste , silicate , mineralogy , chemical engineering , metallurgy , nuclear chemistry , geology , chemistry , engineering
The degree of alteration of a multiphase ceramic waste form (Synroc‐D) exposed to flowing water at 75°C is reported. After 117 days, a 25‐ to 30‐μm deep leach zone developed from which all silicate phases have congruently dissolved. The associated spinel and titanate phases appear unaltered, whereas an Al(OH) 3 precipitate ∼ 5‐μm thick develops at the sample surface. The dissolution of silicates and deposition of the precipitate are simulated using a modification of the crackling‐core model. The model predictions closely match the observed behavior of the material. Implications of these results for long‐term stability of the waste form are discussed.