Question

The table below contains information re the size reduction of material A (2000 kgm-3) after it was crushed in a ball mill. Size analysis of a sample of material A before it was crushed found 30%, 50% and 20% consists of particles in the size range of 106-75, 75-53 and 53- 37 ?m, respectively.

(a) Given that the specific rates of breakage are based on 30 s in the mill, how long does it takes to completely crush all the material with size range between 75 µm and 106 µm? (b) Determine the size distribution of the product materials in part (a).

Size range (µm)	106-75	75-53	53-37	37-0
Interval Number (j)	1	2	3	4
Si	0.60	0.50	0.45	0.40
b(1,j)	0.00	0.00	0.00	0.00
b(2,j)	0.40	0.00	0.00	0.00
b(3,j)	0.30	0.60	0.00	0.00
b(4,j)	0.30	0.40	1.00	0.00

Answer 1

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