Rotation of ball mill at critical speed - Material Science

Q.  At critical speed of rotation, ball mill rotates at
- Published on 06 Aug 15

a. high speed
b. low speed
c. neither slow nor very high speed
d. none of the above

ANSWER: neither slow nor very high speed

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    Discussion

  • Sravanthi   -Posted on 07 Oct 15
    The material to be disintegrated is tumbled in a container along with wear resistant solid balls in ball milling method. These solid balls hit the material and break them. Ball milling method is used for carbide metal mixtures and cermet materials to perform blending and to reduce particle size.

    Milling method uses ball mill, rod mill, impact mill, etc to produce powders of required grade and fineness. If speed of rotation is low, it results in insignificant milling action as balls only move in lower part of the drum. If speed of rotation is very high, the balls cling to the drum walls due to centrifugal force. Therefore, intense grinding action is obtained only when drum rotates at critical speed and here the ball mill rotates at a speed which is neither slow nor very high.

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