| Summary: | The hydrothermal synthesis method is one of the successful methods for transforming kaolin
into sodalite with various parameters considered. The variation of alkalinity source of 2-3 Molarity of
sodium hydroxide and crystallization time (12-16 hours) was considered an important parameter that
influences the formation of sodalite. It is reported in this research that the process of synthesizing
sodalite to transform into an amorphous stage (Metakaolinization phase) began with beneficiation of
kaolin to remove the impurities and calcination by 6500C for four hours. The synthesis was done through
an aging process (400C, 24 hours), and the crystallization temperature was 1000C. The kaolin was
characterized by XRD, FESEM, FTIR, PSA, TGA, followed with metakaolin by XRD, FESEM, FTIR,
and the end-product by XRD, FESEM, FTIR, and PSA. The crystallinity percentage of sodalite slightly
increased by increasing the molarity and crystallization time, but quartz remains in the end-product.
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