Evolution of pyrophyllite particle sizes during dry grinding

摘要: The Bertaut-Warren-Averbach (BWA) technique and high-resolution transmission electron microscopy (HRTEM) were used to characterize the products of dry-ground pyrophyllite. Mean crystallite thickness distributions measured for each sample using BWA technique. decreases during treatment with respect grinding time energy applied per unit mass. data checked by HRTEM measurements good fits obtained samples having small mean particle thicknesses. Samples thicker particles could not be properly because number counted from images is statistically insufficient. shape particle-size distribution determine mechanism pyrophyllite degradation. Particles initially a lognormal size are first delaminated randomly, then some preferentially, thereby producing polymodal distributions. Finally all undergo delamination yielding distribution.