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    At the Polysius Research Centre Atwal wear (HPGR with 100 mm roll diameter) and Regro (HPGR with 720 mm roll diameter) reliability tests were conducted. The results of these test indicated that Platreef ore is very amenable to HPGR comminution, having high specific throughput rates, creating high percentage of fines (29–33% passing 250 μm)

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    HOW ENERGY EFFICIENT IS HPGR? 7 Introduction Daniel (2008) summed up the situation succinctly: ‘Although it is recognized that the energy efficiency of most comminution devices, especially ball mills, is generally very poor, how efficiently energy resources are used in the future will become more important.

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    scale batch test method for determining a work index for HPGR of a large number of samples that can be used to show the variability of the ore as an integral part of a geometallurgical approach to circuit design and production forecasting. The test equipment that was developed comprises a hydraulic press with adjustable pressure operating on

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