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mar 12, 2015 future applications may feature even finer screen sizes to enhance the energy efficiency of such a circuit. the moisture content of the screen oversize and the size of the screens themselves will be critical to the success of such installations. hpgr as metallurgical tools-series hpgr. We re-designed our legacy roll press to upgrade it and optimise it for mining duty, and the result is our s-series hpgr. though this series is meant for smaller projects, plants and retrofits, it is packed with plenty of the same features that are in our larger models.the comminution circuit at vizcachitas, where the hpgr circuit will be incorporated, is a three-stage crushing circuit using a gyratory primary crusher, three cone crushers in open circuit and two hpgr as a tertiary stage arranged in a closed circuit followed by ball mills.aug 07, 2019 the unique cylindrical roller bearing arrangement of the enduron hpgr removes the ever-present threat of hpgrs suffering from bearing failure, which often has a significant price tag and lead-time risk attached due to the global shortage of large engineered bearings. the flexibility of hpgr provides advantages for a variety of comminution circuits