The particle size of both amorphous silicate and seed used as starting materials has been investigated in terms of its influence on the synthesis of crystalline layered sodium silicate with the aim of obtaining a good builder for the detergent industry. The optimal quality of crystalline silicate was obtained when both starting materials used were in the size range of 0.038-0.1 mm. The kinetic parameters of the crystallization process were calculated as functions of the particle size of the glass powder using the DTA technique. The order of the crystallization reaction (Avrami exponent), n; the activation energy, E; and the frequency factor, k(0), for the overall crystallization process were obtained using the Kissinger method. The activation energy was also calculated using the Takhor method and compared to the results obtained using the Kissinger method. Significant differences between the two methods were not found. Among the different grain sizes used, particles in the range 0.038-0.1 mm needed less activation energy for the crystallization process.