Question: 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

A hard rock (specific gravity = 3.8) is fed at 12000

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, 1 Classifying Crusher Raw Feed,FI Ball Mill discharge. P: 1 Screen Undersize Product, P 1 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 -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 0.1 0.2 0.4 0.2 0.1 0 0 0 0 0 0 0 0 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)

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