Effect of calcination parameters of alumina hydrate on the properties of alumina

In the present investigation, the variation of properties of alumina hydrate and alumina during calcination with respect to different parameters like temperature, retention time, grain size and soda content to evaluate the change of BET surface area have been studied. The effect of mineralisers like AlF 3 and NH 4 F, for transformation of alpha phase of alumina has also been studied on a laboratory scale. Conversion to about 96% of alpha alumina was achieved by using 1% of mineraliser at l100°C. While the BET surface area reduced with temperature and finer size of alumina hydrate, the alpha formation showed an increasing trend. The change of properties like density, porosity, humidity and compressibility with respect to temperature has also been reported.