Abstract:Based on the breakage mechanism of inter-particle layers compression, high pressure grinding rolls (HPGR) is characteristic of high productivity, energy efficiency, etc. Compared with traditional crushing methods, comminution product from HPGR is also characterized as high content of fine-grained particles, sufficient development of micro-cracks, improved mineral liberation as well as low Bond ball mill work index. With the improvement in compressive strength and anti-abrasion properties of the roller surface materials in recent decades, HPGR has been widely used in metallurgical mines, such as diamond liberation, pellet feed grinding, pebble crushing in autogenous and semi-autogenous mill circuit, metallic mineral crushing before grinding, etc. Successful popularization of HPGR depends heavily on the comminution behavior. With the aim of a comprehensive insight into the comminution behavior of HPGR, the present work brings together the literatures in terms of the developed background, working principle, pressure distribution on roller surface, macro breakage processes of HPGR, where the stress behavior of particle bed and product feature in compressive bed breakage are also included. Finally, edge effect and roller surface abrasion of HPGR, as well as the associated generating mechanism and solutions were analyzed.