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Cement is made by strongly heating a mixture of limestone and clay in a rotary kiln. First limestone and clay are mixed in the ratio of 3: 1 by mass. It is dried and mixed to get fine powder. This mixture is put into kiln through a hopper. Rotary kiln is kept in slanting position and it is rotated continuously very slowly. When this mixture reaches at the bottom of the kiln a blast of hot gases is passed into the rotary kiln from the bottom upwards. The high temperature created due to hot gases help limestone and clay to reach together to form small cement pieces called clinker. Clinker is cooled and mixed with gypsum. Then this mixture is ground to get a fine powder. This fine powder is cement.