Bentonite is naturally occurring plastic clay of great commercial importance. Bentonite is mainly used as a binder in medium and high-grade casting, in foundry industry, in palletizing iron ore etc., as a component of cement and concrete mix in construction of dams, canals, reservoirs, as a component of drilling mud in water well and oil well drilling. It is also used in paper, ceramic, lubricant, soap and detergent, pharmaceutical, cosmetic, insecticide, etc.