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Investigation on the particle size and shape of iron ore Table 3 Primary grinding of iron ore concentrate by HPGR Specification 80 Feed moisture wt Specific force N mm 2 Roller speed m s 1 SSA Blaine cm2 gr 1 P 181m Quantity 6 5 3 5 0 55 1540 62 The samples were subsequently ground in HPGR to the target SSA Blaine of 1800 2200 cm2g It was essential to obtain Blaine numbers as close to
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