Fly ash powders were refined and separated into fine and coarse size by multi-air classification, and each particle was used for synthesizing mullite and zeolite. Mullite was prepared by sintering the mixture of fine fly ash with mean size of 6.5 $mu$m and $A1_2$$O_3$powder at above $1450^{circ}C$. Zeolite was synthesized through hydrothermal reaction with coarse fly ash mean size of $56.3mu$m in 3.5 M NaOH solution at $120^{circ}C$. The whole range of particle size can be recycled through size classification into fine and coarse fractions, which are used for syntheses of inorganic materials.