Nesans Spiral Classifier consists of an open trough with a chute provided for the input feed material. Before being fed into the spiral classifier, the dust from the screen is mixed with water and it is carried to the input chute through a slurry pump. The inlet flow is evenly distributed across the surface area of the spirals. It is always advisable to feed the input slurry at one third of the total length point of the spiral. Upon entering the classifier, the material gets segregated depending upon its particle size. Coarse particles tend to settle down whereas fine particles float up the water surface.

Coarse materials which has settled down are transported by the spirals towards the output chute. The material will be dewatered by drainage in the upper part of the spiral before discharge.