A process for production of pure zeolite 4A from raw kaolinite

摘要

The invention relates to a process for production of zeolite 4A form raw kaolinte, the process comprises calcining the ground raw kaolinite to convert to metakaolinite, dealuminating the metakaolinite and separating the unreacted solid, the filtrate was blended with aluminum salt and neutralized with alkali, the unreacted soild was treated with aqueous alkali followed by separation of the solid residue, the alkaline solution that containing sodium silicate, was mixed with the aluminate solution and placed in a water bath for crystallization the crystallized zeolite 4A formed was separated