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# mechanical operations ball mill formula

The ball should be rotated with a speed that is equal to 70% of the critical speed, which is calculated from the formula given below. √ ( )-----(1) where, N c - critical speed (revs per second) R - Radius of the ball mill (m) r - Radius of the ball (m) g - Gravitational constant (9.81 m/sec 2) 2r = 10.41 mm (measured using screw gauge) 2R = 72 mm (measured using vernier calipers) N c = 2.84 revs per second = 176.4 revs per minute (rpm)

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Apr 08, 2021 · Based on his work, this formula can be derived for ball diameter sizing and selection: Dm <= 6 (log dk) * d^0.5 where Dm = the diameter of the single-sized balls in mm.d = the diameter of the largest chunks of ore in the mill feed in mm

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where db.max is the maximum size of feed (mm); σ is compression strength (MPa); E is modulus of elasticity (MPa); ρb is density of material of balls (kg/m 3 ); D is inner diameter of the mill body (m). Generally, a maximum allowed ball size is situated in the range from D /18 to D /24

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Nov 18, 2008 · Equations of the design By knowing the capacity quot;Cquot; {ton} of the feed; we can get approximately the length quot;Lquot; {mm} and diameter quot;Dquot; {mm} of the batch ball mill, form **D = 124.2*(C) + 485.7 **L= 85.71*(C) + 1854 …

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In ball mill operation, the feed size (Df in meters) and the ball diameter (Db in metres) are related as (where, K = grindability constant (varying from 0.9 to 1.4 in increasing order of hard ness)) A. D b 2 = K. D f B. D b = K. D f C. D b 3 = K. D f

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