Bond Work Index (Energy equation) - Grinding ...
WI= Work Index= specific energy per ton, kwh/metric ton (characterizes the ore) F80 = 80% passing size of the circuit feed, in microns. P80 = 80% passing size of the circuit product, in microns. Example. The dry feed of a ball mill circuit is 300 t/h. The power at the pinion of the ball mill is 1800 kW.
