Bayer Alumina with more than a 99.8% purity with a average mean size value of 80 to 85 micron and with a specific surface area of 3.7 to 3.9 square meter per gram was used for the experiment of different milling methods effects. An addition of 1% MgO was added as a sintering aid to impede grind growth. The grinding media was high purity alumina with more than 99.7% alumina content.
No addition of organic binders and the alumina was mechanically dispersed in water by using a stirrer. The dispersed material was ground in stirred media mill and vibrating mill separately and the properties were studied.
In wet grinding the surface chemistry plays an important role. This is influenced by surface chargers, the type and concentration of surface defects, unsaturated bonding states and the morphology of the particle surface.
To be contd….
