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HPGR abbreviation stands for High Pressure Grinding Rolls

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High-pressure grinding rolls ... Microscopic work indicates that HPGR minimizes this problem by providing considerably more alternative leaching space.

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HPGR - High pressure grinding roll for the minerals industry

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2008. THE DEVELOPMENT OF A SMALL-SCALE TEST . TO DETERMINE WORK INDEX FOR HIGH PRESSURE . GRINDING ROLLS . ABSTRACT. The use of High Pressure Grinding Rolls is ...