Energy Losses and Increases in the Specific Surface Area of the Alumina Oxide During the Compressibility Processes

The percentage of losses in input energy and an increase in the specific surface area of the ground alumina oxide during the compressibility process with various applied pressure, compaction velocity and the feed particle size have been investigated. The apparatus consists of two punches and large die which is a single punch pressing. The applied pressure varied over the range of 3.1 to 30.3 MPa and the compaction velocity adjusted from 0.5 to 100 cm/min. The feed particle sizes used are 6000, 5000, 4500, 4000, and 3500 μm.The ground alumina oxide was screened by sieves analyses method. The percentage of losses in input energy and the increase in the specific surface area for each case were evaluated.The results of this investigation indicated that the compressibility process gives a size reduction of a coarse particles with low energy losses approximately 21–25% compared to that obtained by using the ball mill. Also high size reduction occurred at a slower compaction velocity and high applied pressure as well for all feed particle sizes. These results will help us in the design of mills in order to decrease the losses in input energy for size reduction of solid material.