FORMATION OF ANALCIME FILM UNDER HYDROTHERMAL CONDITIONS

Polycrystalline analcime film was prepared from hydrogels under hydrot hermal conditions. The analcime film of about 200 mu m thickness built up on a porous alumina support at temperatures above 160 degrees C, a nd the size and crystallinity of analcime increased with temperature. The thickness of analcime film increased with incubation time, and the growth rate at 180 degrees C was faster than that at 160 degrees C. T he analcime film obtained was thermally stable at temperatures up to 7 00 degrees C. and no structural changes were observed after treatment in nitric acid solutions below 0.01 M. Analcime had an ion-sieve abili ty to large sized Cs+ ion, and Ag+ and Rb+ ions of small sizes were in corporated in analcime.