... ' requirements. 3. Used for refractory products. Refractory raw material,Refractory material, ceramic raw material Refractory raw materials is the main raw material for production of refractory products and high ... calcined flint clay clinker,sintering mullite, calcined kaolin, calcined bauxite, corundum, silicon carbide, calcined alumina, fire clay, ball clay etc. Refractory raw material