The dry sand from the tertiary or quaternary crusher is first screened through an inclined vibrating screen to remove the oversized materials. The sand is then mixed along with water in a specified ratio using a slurry pump and it is fed into the classifier through a feed inlet provided below the dewatering screen. As a result, the material enters the trough through a non-turbulent section of the bucket classifier.

As a matter of fact, Finer particles due to its less weight tend to float up the water surface whereas heavier particles tend to settle down. The force of the inlet feed and the movement of the bucket wheel assembly tends to push the heavier sand apart from the bottom of the classifier into the tub. Furthermore, The screw system which runs extremely slowly pushes the sand into the bottom of the bucket wheel assembly. Due to the shoveling action of the bucket wheel, classified sand is delivered via the output chute.