Air classifier - Double cone type is used to centrifugal separate the coarse particles. The airflow of air classifier conveys the material from below between the external and internal envelope and subsequently reaches the upper part of the separator. The air while passing through the blades of air classifier, which are regulated, from the outside of the separator assumes a rotary motion and enters the central cone. With the centrifugal effect in air classifier the coarse particles [the heavier ones] are accumulated on the bottom of central cone and are then conveyed through a suitable pipe. These are used for a wide range of applications in paints, dye stuff, hydrated lime, clays, pigments, insecticides, and pesticides.