A Sand Classifier, used for separating crushed sand from natural mud or silt.

Silt mixed crushed sand if used for making concrete yields low strength and hence this machine is particularly useful for obtaining crushed sand for use in high strength concrete.

The mixture of silt and sand is fed at the feed (lower) end of the inclined screw conveyor. The silt particles being lighter than water do not settle down and are drained away with water. The crushed sand being heavier than water settles on the bottom part of the trough of the screw conveyor and is conveyed at the discharge end for collection / stacking.