Chamotte Calcined kaoline We have calcined kaolin :calcination of crushed raw kaolin is done in a modern rotary kilnwith high efficiency . The fired kaoline grains have high density and volume stability .The chemical constitution and properities of the calcined kaolin grains are illustrated in the following table. Technical data of calcined kaoline Crushed calcined kaolinchemical analysis % 52.0 - 56.0 silica (sio2) 40.0 - 42.0 alumina (al2o3) 2.0 - 2.5 titania (tio2) 1.0 - 1.5 iron (fe2o3) 0.2 - 0.4 lime (cao) 0.1 - 0.2 magnesia (mgo) 0.2 - 0.4 alkalies (na2o + k2o) < 0.2 moisture content % Physical properties 2.55 - 2.65grain density (g/cm3) 2.50 - 3.50water absorption % 7.0 - 8.0 apparent porosity % > 1730refractoriness( c) As requiredgrain size (mm)