Abstract: The experiments with hydrothermal method to synthesize 4A-type zeolite have been carried on in different conditions of alkalinity, liquid solid ratio, the temperature and time of crystallization and the experimental results and synthetical factors were analyzed and researched. Analysis and experimental results indicate that NaOH has more effect than Na2 CO3 and KOH in the process of synthesizing zeolites and alkali calcination, proper crystal seeds can cut down the time of crystallization and improve quality of synthesized zeolites. In the conditions of alkalinity 2.5-4.0M, liquid/solid ratio 6:1-8:1, temperature of crystallization 90-103℃ and time of crystallization 3-5h, 4A-type zeolite can be synthesized from SZT.The synthetical zeolites are characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM).

Key words: The experiments with hydrothermal method to synthesize 4A-type zeolite have been carried on in different conditions of alkalinity, liquid solid ratio, the temperature and time of crystallization and the experimental results and synthetical factors were analyzed and researched. Analysis and experimental results indicate that NaOH has more effect than Na2 CO3 and KOH in the process of synthesizing zeolites and alkali calcination, proper crystal seeds can cut down the time of crystallization and improve quality of synthesized zeolites. In the conditions of alkalinity 2.5-4.0M, liquid/solid ratio 6:1-8:1, temperature of crystallization 90-103℃ and time of crystallization 3-5h, 4A-type zeolite can be synthesized from SZT.The synthetical zeolites are characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM).