Classifier mill
TYPE MIKRO MAK
HOSOKAWA ALPINE
Principle of operation
The characteristic feature of the Mikro MAK is the same as with all other classifier mills, i.e. the grinding and classifying process takes place in one single machine.
The feed material is fed to the Mikro MAK pneumatically, whereby comminution is a result of the material impacting first against the rotating grinding elements and then against the stationary liner. With beater edge speeds of up to 130m/s, fineness values of d97=100 µm are achieved. In the case of mills with radial inlet and radial classifying wheel, the rotor can rotate in both directions so that the wear to the grinding elements is more uniform, thus guaranteeing a longer service life. The toothed discs of all mill types can be turned through 180° to help prolong their service life.
The feed material gets caught up in the air sucked through the mill by the downstream fan, and is routed along the baffles of the shroud ring into the classifying zone. Here, separation into a coarse and a fines portion takes place on account of the two opposing forces and the different mass of the particles.
The coarse material is rejected by the classifying wheel and is returned to the grinding zone, where it is ground again. The fines pass through the classifying wheel and exit the grinding chamber. The cut point is set as a function of the classifying wheel speed and can be adjusted steplessly even during operation.
