Mechanical Operations
Which of the following gives the work required for size reduction of coal to -200 mesh in a ball mill most accurately ?

None of these
Bond's law
Rittinger's law
Kick's law

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Mechanical Operations
Bond crushing law

Calls for relatively less energy for the smaller product particles, than does the Rittinger law
States that the work required to form particle of any size from very large feed is proportional to the square root of the volume to surface ratio of the product
Is less realistic in estimating the power requirements of commercial crushers
States that the work required for the crushing is proportional to the new surface created

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