### Size Reduction Of Material Using Ball Mill

Apparatus: ball mill. sieve set. weighing balance. sample. procedure. kept 100 gm of rice and charge it to series of sieves to get pregrinding size distribution. continuous sieving for 10 minutes. weigh the mass of rice retained on each sieve. load the rice into ball mill along with metal balls. run the ball mill for 30 minutes at a speed of 1.Apr 27, for example, reduction to one-half of the original particle size requires about 4-3 kg cm per gm by impact as compared to 18.5 kg-cm by ball mill; that is, the energy requirements are less than 25 percent as much for impact crushing as for ball milling. for great size reduction the application of energy by a single impact becomes less effective so that there would be no advantage in applying more impact energy than would be required for about a four-fold reduction of particle.