Experimental and population balance modeling on spiral type Air Jet Mill: Batch milling*

Jet milling is an energy-intensive process which is widely used in several industrial applications. In this research, experiments and population balance modeling have done to optimize the parameters like grinding pressure, milling residence time and hold-up to increase the performance of jet mill. This study investigates the effect of parameters on the flow pattern, particle concentration, median particle size and distribution and breakage yield through the experiments in a lab scale jet mill. 

In the visualization study, the concentration of particle is more in the peripheral region since the more collision occurs in the peripheral region produces reduced size particle and narrower size distribution. The fine median particle size and narrow size distribution are obtained with highest grinding pressure, milling residence time and lowest holdup. Breakage yield increases with an increase in grinding air pressure and milling time, and decreases with an increase in the holdup.

From experiments and modeling, the particle size distribution becomes narrower with time and particle size decreases with time has observed. The experiments and modeling results optimize the grinding pressure, milling residence time and hold-up in the milling.