Dynamic Air separator / Classifier is a simple equipment having two cone /cylinder (inner & outer and an impeller with vanes built with wear resistant material to generate whirling air circulation action. The fines from the crushing plant is fed through feed inlet and dropped by gravity on the Auxiliary fan. The Auxiliary fan is connected to the drive motor through a housing. The Rpm of fan can be throttled through VFD fitted to the motor to control the amount of fines to be separated. The main fan creates continuous circulating air into which the distributor disperses the fines.
Material acted upon the distributor plate is subjected to the following forces namely, Centrifugal force, Ascending air force, Gravity force. Fine particles below 150 microns size are lifted by the ascending air current and pass between the blades of auxiliary and Main into the outer cone of the separator. The (-) 150 microns transferred into the outer cone are discharged from the unit bottom in to a conveyor and transferred into a closed tank through a conveyor.
Underneath the separating zone there is return air vanes are located, the main fan moves the air to separating zone from the return air vanes. The separation of fines can be attained by reduction is descending air velocity and also by adjusting the direction of return air vanes.
Heaviest particle mainly + 150 microns - 5mm not ascending will fall to the bottom of the inner cone and on to a chute and stock plied on the ground through a conveyor belt. which is classified Sand conforming to the standards prescribed in IS 383.
Air velocity , volume of Air and speed of Rotation are important factors to achieve the good separation of fines from heavier particles .The Moisture content in the input material .As per the available data it can operate up to 2-3% moisture by wt in the feed material.
The Dry classifiers are custom designed with varying capacity depending on the input fractions percentage. They are available in three variants up to a capacity of 250 Cu.M/hr.
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