Fluidization behavior of nano-particles by adding coarse particles

Fluidization behaviors Of SiO(2) and TiO(2) nano-particles by adding coarse particles of FCC, ordinary Al(2)O(3) and heat-resistant Al(2)O(3), has been investigated experimentally. The effect of size and inventory of coarse components on the fluidization behavior of nano-particles has been studied. The results reveal that the fluidization quality of the mixture systems can be improved with increasing the amount of the coarse particles. For SiO(2) nano-particles, the optimum of FCC, ordinary Al(2)O(3) and heat-resistant Al(2)O(3) are 30%, 40% and 50%, respectively. Similarly, the optimal amount of FCC, ordinary Al(2)O(3) and heat-resistant Al(2)O(3) is about 30% for TiO(2) nano-particles. Fluidization quality is almost the best for all these three coarse additives of 65-80 mu m. The analysis performed from the standpoint of the Richardson-Zaki (R-Z) equation reveals that the apparent terminal velocity derived through scaling experimental data to R-Z equation affects the expansion index of the mixture systems. (C) 2009 The Society of Powder Technology Japan. Published by Elsevier BV and The Society of Powder Technology Japan. All rights reserved.