Installed upstream of the calciner and the rotary kiln, the preheater is a tower that heats up the raw mix with hot gases from the kiln. Main components of the preheater tower are cyclones which are conical vessels with openings at the top and bottom. Hot gas laden with raw mix is released tangentially inside a cyclone and particles separated through centrifugal force go down through a valve at the bottom, while clean gas passes up through an opening at the top called vortex finder. Depending on the requirement, there could be a single string or double strings of preheaters along with several stages of cyclones. Made with high purity materials, Dalmia’s high alumina bricks are well-known for their superior abrasion and thermal shock resistance.