##### Mill (grinding) - Wikipedia

Know MoreBond for 50 mm >d >005 mm , W is the work index measured in a laboratory ball mill (kilowatt-hours per metric or short ton) P 80 is the mill circuit product size in micrometers; F 80 is the mill circuit feed size in micrometers Rod mill A rotating drum causes friction and attrition between steel rods and ore ,...

## Investigating of the effect of ore work index and particle ,

Know Morewhere Wi is the work index of ore (kWh/t); P i, test sieve size at which the test is performed; G bg, Bond's standard ball mill grindability, net weight of ball mill product passing sieve size P i produced per mill revolution (g/rev); P80, sieve opening at which 80% of the product passes (μm); F80, sieve opening at which 80% of the feed passes (μm)...