Cold state test for classifying coarse and fine particles in the fluidized slag cooler under diffierent superficial velocities has been carried out.The results show that as follows:(1)When the superficial velocity is higher than the terminal velocity of fine particles

a great amount of the fine particles will be elutriated from the classfier

while the coarse particles will be fluidized at the bottom part

but the carrying hieght of course particles is limited

hence

the segregation of coarse and fine particles can be realized;(2)The carrying height of coarse particles can be influenced by both the superficial velocity and the concentretion of fine particles in the classifier;(3)enlarging the diameter in the dilute zone of the classifier can reduce the carrying height of the coarse particles.