of start-ups was 129 and thus 6% of the start-ups could have caused locked charge damage The SAG mill tumbling angles were mostly between 30 and 40 degrees yet it is interesting to note that some start-ups also had high tumbling angles As expected high tumbling angles are reached more often in the ball mill as the particle size is smaller Feb 12 2009A ball mill requires higher torque to turn until it reaches a speed where the balls drop onto the down-going side of the mill Starting torque can also be srongly affected by the position of the ball load in the mill at start and by balls sticking together due to sitting motionless

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The ball mill is a tumbling mill that uses steel balls as the grinding media The length of the cylindrical shell is usually 1–1 5 times the shell diameter (Figure 8 11) The feed can be dry with less than 3% moisture to minimize ball coating or slurry containing 20–40% water by weight

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