Wet Process:

In this process, the limestone is crushed to smaller fragments and then it is taken to a ball or tube mill where clay or shale is mixed with it and ground to a fine consistency of slurry with the addition of water. The slurry is pumped to slurry tanks where it is kept in an agitated condition by means of rotating arms with chains to prevent setting of limestone and clay particles. At this stage, the chemical composition of slurry is adjusted as necessary. The corrected slurry is stored in storage tanks and kept in homogeneous condition by the agitation of slurry.

The corrected slurry is injected at the upper end of a rotary kiln. Rotary kiln is formed of steel tubes. A diameter of rotary kiln varies from 3 m to 8 m and length varies from 30 m to 200 m. The kiln is supported at intervals by columns of concrete or masonry. That is laid at a gradient of about 1 in 25 to 1 in 30. The refractory lining is provided on the inside surface of rotary kiln. It is so arranged that the kiln rotates at about one to three revolutions per minute about its longitudinal axis. A burning is carried out in this rotary kiln.