In this paper, the classification and the concentration performances of the choking-free cyclone which is driven in a lower range of the screw speed was investigated.
The main results obtained are summarized as follows.
(1) The size of separated particles can be varied widely-20ηm to 4mm in this cyclone-simply by regulating the rotational speed of the screw.
(2) In these operating methods, the solid content in underflow showes the constant value which differs with each sample slurry. But the value of solid volume modulus for underflow (Ro) is equal to about 1.7 regardless of the slurry.
(3) The size of separation of the choking-free cyclone has been expressed experimentally by the equation (9). In case the solid content and the size distribution of the particles in feed and the amount of screw discharge are wellknown values, the size of separation can be obtained easily by the equation.
(4) The classification performance of the choking-free cyclone is closely related to the shaft torque of the screw conveyor. The speed control of the driving motor for the screw in relation to the torque makes it possible to operate this cyclone effectively.
