The main function of refractory materials for cement kilns is to serve as the lining of the cement kiln. It should maintain the high temperature required for firing cement clinker, while protecting the kiln equipment and reducing the heat loss of the kiln. In terms of refractory materials technology, refractory materials for cement kilns have developed from a few varieties such as clay bricks and high alumina bricks to a family of nearly a hundred materials. Today, refractory materials for cement kilns include sintered alkaline refractory materials, sintered aluminosilicate refractory materials, monolithic refractory materials and prefabricated parts, and insulated refractory products.