Effect of Grinding on The Structure, Particle Size and Shape of Pyrophyllite and Talc.

Abstract

Pyrophyllite and talc structural alterations, induced after dry grinding, were studied by nitrogen adsorption, thermal analysis and by X-ray diffraction methods. Structural degradation after grinding for a short time was followed by particle breakdown. After prolonged grinding, particle breakdown resulted in about 0.04μm for pyrophyllite and about 0.02μm (lateral diameter) for talc and about 0.02μm and 0.01μm in thickness, respectively.