Given that a ball mill is being fed at 250 tonnes per hour for a certain zinc sulphide ore and 80% of the ore passes 1.5mm and that after grinding at 70% solids, 80% of the mill discharge passes 125microns.
(i) If the Bond work index for this size reduction is measured as 14.5kWh/t, calculate the energy consumption for the ore. (10 marks)
(ii) What are the limitations of this energy approach? (5 marks).
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