LIAO Dahai, NING xiang, WU Nanxing, JIANG Zhuting, CHEN Tao,
(School of Mechanical and Electronic Engineering, Jingdezhen Ceramic Institute, Jingdezhen 333403, Jiangxi, China)

Abstract: In order to analyze the relationship between blank particles and the spindle speed of dry granulation for manufacturing ceramic tiles, blank particles are prepared by granulation with dry granulation system for ceramic tiles production, using clay, feldspar, quartz, etc.as raw materials. Then the relationship of the particles’ mobility and the percentage of effective particles with the spindle speed is analyzed,and numerical simulation is carried out to verify the validity of the experimental results. The experimental results show that when the spindle speeds are 2500 RPM, 2700 RPM, 2900 RPM, 3100 RPM and 3300 RPM, the mobility indexes of the blank particles are 58, 68, 80.5, 74 and 67, and the percentages of effective particles are 81.5%, 83.1%, 88%, 86.4% and 83.9%. The numerical simulation shows that when the spindle speeds are 2500 RPM, 2700 RPM, 2900 RPM, 3100 RPM and 3300 RPM, the maximum packing densities of blank particles at the granulating chamber bottom are 0.40, 0.36, 0.32, 0.36 and 0.36. The comprehensive analysis shows that when the spindle speed is 2900 RPM,the mobility of the blank particles is the highest, the percentage of effective particles is optimal, and the granulation result is the best.

Key words: dry granulation; spindle speed; particle mobility; effective percentage of particles; volume distribution