Question: Please give me right answer... Previous answer was incorrect QUESTION 2 [20 Marks] A hard rock (specific gravity = 3.8) is fed at 12000 kg

 Please give me right answer... Previous answer was incorrect QUESTION 2

Please give me right answer... Previous answer was incorrect

QUESTION 2 [20 Marks] A hard rock (specific gravity = 3.8) is fed at 12000 kg per hour (F2) to a ball mill operating with a classifying screen. The overhead from the classifying screen is recycled back (8000 kg/h) to the feed. Oversize Recycle, R Classifying Raw Feed, F1 F2 Crusher discharge, P1 Screen Ball Mill Undersize Product, P2 The ball mill produces the following particle size distribution and a work index of 15.3 kWh/ton. Mass fraction Mesh (um) F1 F2 P2 0.1 0.2 0.4 0.2 0.1 0 -6680 +4699 -4699 +3327 -3327 +2362 -2362 +1651 -1651 +1168 -1168 +833 -833 +589 -589 +417 -417 +295 -295 +208 -208 +147 -147 +104 -104 +74 0.033 0.067 0.133 0.067 0.047 0.027 0.040 0.167 0.200 0.133 0.040 0.027 0.020 0 0 0.03 0.06 0.09 0.35 0.30 0.08 0.05 0.04 0 a) Determine the average particle size (mm) of the feed and product from the ball mill. (16) b) Estimate the energy required (kW) to archive the particle size reduction determined in part a). (2)

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