Hybrid Comminution with High-Pressure Roller and Stirred Bead Milling

摘要

This paper presents the experimental results on the wet grinding of a moist calcium carbonate material in a hybrid comminution system,which consists of a high pressure roller mill (HPRM) and a subsequent stirred bead mill.The results show that the pre-treatment of the material with the HPRM could result in energy saving and efficient size reduction during the subsequent wet ultra-fine grinding in the stirred bead mill.It was found that the level of fineness of the ground product is dramatically influenced by the number of repeat passes of pre-grinding in the HRPM.The formation of micro-cracks in the particles under compressive loads was discussed in order to elucidate the role of the HRPM as a pre-grinder in the hybrid comminution system.The simulated breakage behaviors of various irregular shaped particles indicate that the tortuous micro-crack propagation paths and the crack branching behavior are related to the heterogeneity of the particle and the stress distributions.