Optimizing Dry Ultrafine Grinding of Talc in Attritor Mill

Abstract

In this work, the parameters affecting the dry grinding of talc in the attritor mill were investigated. The attritor was tested with its initial design without balls then with balls as additional grinding media to prepare a feed passing 45 microns. The prepared feed (-45 mm) was used to produce a product with 10 μm or less using statistical design in presence of balls. The presence of balls enhances product fineness. The significance of the studied factors is: stirrer speed>mill filling >grinding time. In addition, the d 50 was correlated with studied factors. The mean particle size (d 50 ) as low as 6 μm was obtained at 460 rpm, 20% mill filling, and after 60 min grinding time.