Transformation of natural clinoptilolite to high purity of synthetic zeolits

摘要

In this paper, the Chinese natural clinoptilolite was treated hydrothermally, with fusion with NaOH powder as pretreatment. High purity of zeolite Na-Y, Na-P and Na-A were identified as the reacted products, depending on the reaction conditions such as hydrothermal time and the Si/Al molar ratio in the gels. And their cation exchange capacity (CEC) are 257, 355 and 335meq/100g respectively, which are greatly higher than that of the natural zeolite (97 meq/100g). In the hydrothermal reaction, an interesting phenomenon of crystal transformation has also been found.