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The effect of liquid additives of grinding aid on the ultrafine grinding of alumina was studied by using a vibration rod mill. Liquid additives studied were five alcohols and two glycols with different alkyl groups. Experiments were carried out by batch operation, and the changes in specific surface area of products with grinding were measured by BET adsorption method. The behavior of alumina powder during grinding was also investigated by monitoring the temprature change of the grinding vessel. The results showed that alcohols and glycols had a significant effect on the ultrafine grinding of alumina as a grinding aid. The maximum specific surface area of alumina obtained with an additive was found to increase proportionally with the amount of additive. The thermal analysis of ground products suggested that three molecular layer of the additive molecules existed on the product surface when the specific surface area reached the maximum value. It was found that the monitoring of the temperature change of grinding vessel would be useful in understanding the grinding status.

Effect of Liquid Additives and Behavior of Alumina Powder in Ultrafine Grinding of Alumina.