This definition appears frequently
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Samples in periodicals archive:
Coarse grinding with efficient high pressure grinding rolls reduces power and capital costs with higher iron recoveries.
JKTech completed testing to determine ore grinding characteristics for both conventional crushing/grinding as well as crushing with high pressure grinding rolls ("HPGR") followed by grinding.
WARDROP) to include definitive engineering work in support of high pressure grinding rolls (HPR) technology for its Ruby Creek Project near Atlin B.