Formulation of calcium dialuminate (CaO·2Al2O3) refractory cement from local bauxite

Abstract Three types of bauxites containing aluminum hydroxide of 58.1% gibbsite and 19.3% boehmite for BX3, 95.5% of gibbsite for BX55 and 84.5% of gibbsite for BX8 were used with lime at 95% of CaO through solid state sintering in one stage to prepare a refractory clinker at 1550 °C. The powder obtained after grinding the clinker showed in the XRD curves the presence of CaO·2Al 2 O 3 and CaO·TiO 2 phases in the cement samples. The density of cement powder varied between 2.95 and 3.17 g/cm 3 and the specific area of powder obtained after grinding was between 0.72 and 0.85 m 2 /g. The properties of hydrated cement, W/C = 0.33, after stabilization of cement components for 48 h at 105 °C were showed by XRD, DTA, DTG and SEM (C 3 AH 6 , AH 3 , CA 2 and CaO·TiO 2 ). The Young's modulus of the cement made varied between 35.5 and 39.4 GPa, and these Young's moduli were compared to conventional CA14M cement.