Hydrothermal reactions of zeolites loaded with cesium or strontium.

1 January 1990

journal article
Published by Taylor & Francis in Journal of Nuclear Science and Technology

Vol. 27 (2) , 167-173
https://doi.org/10.3327/jnst.27.167

Abstract

Cesium-loaded zeolites of low Si/Al atomic ratios such as CsA, CsX and CsY were converted to pollucite ((Cs, Na)AlSi₂O₆) by hydrothermal treatment above 243°C, but Cs-mordenite Of a high Si/Al ratio yielded no structural change owing to its high thermal stability. The structural degradation of zeolite and recrystallization to other minerals much depended on the treating temperature and time; CsA was completely converted into pollucite at 300°C for 2 h and at 243°C for 24h. The hydrothermal treatment of zeolites A and X partially replaced Na with CS resulted in the formation of solid solutions occluding pollucite in analcime (NaAlSi₂O₆·H₂O). AS for Sr-loaded zeolites, Sr-feldspar (SrAl₂Si₂O₈) crystallized from SrA or SrX under mild conditions (15O°C, 1 d) compared with those for Cs-loaded zeolites.

Keywords

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