The use of bauxite as raw materials allows ready transformation of the 1:4 mixture (CaO, Al(OH) 3) to CaO·2Al 2 O 3 at 1550 °C. This is reported in the literature [8] . The formation of CaOrichphase and unreacted Al 2 O 3 before the formation of CaO·2Al 2 O 3 is due to .