Investigation into Utilization of Bayer- Al(OH) 3 in Production of Calcium Aluminate Cements

Abstract. In this study, samples of Calcium Aluminate (CA) cements produced from reactive alumina and calcite were compared with those samples produced from Bayer - Al(OH)3 and calcite. The raw material mixtures were formed under light pressure into cylinders and sintered at 1350, 1400, 1450 and 1500 0 C. The fired samples were ground to 3300-4400 cm 2 /g Blaine in a laboratory ceramic mill. The physical and mechanical properties of the cement samples were determined. The results of this study suggest that the production of CA - cements containing 71 % Al 2 O 3 was possible using Bayer- Al(OH) 3 and calcite as raw materials. Introduction In recent years, the use of high alumina cements in the refractory concrete mixtures as a binder has gained importance. The main trend in refractory concrete is the production of high density, dimensionally stable and long life refractory materials by decreasing amount of binding cement. Bauxite, the principal raw material of commercial CA cements should have very high alumina and very low iron and silica contents. SiO