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Refractory cement also called Aluminate cement, Aluminate cement is bauxite and limestone as raw material, by the calcination of calcium aluminate as the main composition, alumina content about 50% - 50% of the clinker, again into the water rigid gelled material.Aluminate cement is often yellow or brown, and gray.Aluminate cement main minerals become a calcium aluminate (CaO, Al2O3, abbreviated CA) and other aluminum acid salt, and a small amount of dicalcium silicate (2, CaO SiO2), etc., is a kind of special cement.