July 31, 2011 
admin 
This is a special type of centrifugal type of classifier, consisting of double row of whizzer blades / rotor fitted on the main shaft. The feed material enters the classifier gets suspended in air through a vertical pipe positioned at the bottom of the classifier. The initial classification takes place in the classifying chamber. After passing the feed dispersion cone, the coarse material is discharged from the classifier by gravitation through the coarse fraction outlet and remaining material rises to the top of the classifier. A rotor accelerates the material to its peripheral speed thus creating a centrifugal force in the particle to act against the air drag forces. As the particles move towards the inside of the rotor and accelerated to its peripheral velocity, a Coriolis effect is generated. As particle velocity increases, the centrifugal force increases and particles can be rejected outside the rotor. The fine fraction is discharged from the classifier and is recovered from the air in a cyclone and bag filter. Filtered air then passes through a centrifugal blower and is exhausted into the atmosphere. A secondary air inlet, supplying the classifier with an additional air stream, is used to clean the coarse fraction from the very fine particles agglomerated on a surface of coarse grains. Hence, the classification efficiency is improved. A special type of an air lock is fitted at the discharge of the classifier cone for the better collection of the coarse and fine particles respectively.
