Process for the filtration of zeolite suspensions

摘要

Zeolites are prepared by hydrothermal crystallization of alkaline aqueous synthesis mixtures. Normally the zeolites are filtered and washed with water until the filtrate shows a pH of about 9 to 12. Sometimes, especially if the resulting zeolite consists of very fine particles, the zeolite filter cake shows thixotropic properties. If the filter cake is washed with diluted sodium hydroxide or only small amounts of water this thixotropy can be avoided.