1985 Volume 22 Issue 4 Pages 284-291
The selective removal and fixation of Cs and Sr have been studied in zeolite A and chabazite. Cesium ion was preferentially distributed into chabazite with a high distribution coefficient (KCs>103 cm3•g-1) in the presence of NaCl (10-1 mol•dm-3). The Ksr values for zeolite A attained about 103 cm3•g-1 in the pH range of 810, and they gradually decreased with an decrease in pH.
The initial rate of Cs adsorption was fairly fast in chabazite, and the adsorption ratio reached almost 100% within a few hours. The adsorption ratio of Sr in binderless A zeolite reached almost 100% after 15 h. The adsorption of Cs and Sr on these zeolites was followed by Langmuir-type isotherm. Cesium forms of these zeolites recrystallized to pollucite (CsAlSi2O6) above 900°C for zeolite A and above 1, 200°C for chabazite. As for Sr forms, these zeolites changed to SrAl2Si2O8 above 900°C.
These recrystallized phases were suitable hosts for the immobilization of Cs and Sr in the nuclear waste solutions.
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