Abstract: The composition, volume and properties of solid particles of the existing mother liquid and filtrate containing silicon in the production of NaY molecular sieve were analyzed. A rapid solid-liquid separation technology was developed to remove NaY microcrystals and P-type heterocrystals, so as to improve the proportion of silicon reuse. In order to further improve the utilization rate of silicon, the online mixing and full reuse technology of mother liquor and filtrate containing silicon was determined. Through the industrialization of the two technologies, on the premise of ensuring the inner property of NaY molecular sieve, the annual silicon utilization rate was increased to 92.85%, which not only reduced the production cost, but also alleviated the environmental pollution caused by the discharge of silicon waste liquid of molecular sieve.

Key words: NaY molecular sieve, mother liquor and filtrate containing silicon, NaY microcrystal, P-type heterocrystals, total reuse, synthesis