Mechanical Operations
A filter press is

Having prohibitively high maintenance cost
Not suitable for wide range of materials under varying operating conditions of cake thickness and pressure
Not suitable, if the liquid is the main product
A batch filter

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Mechanical Operations
Bond crushing law

Is less realistic in estimating the power requirements of commercial crushers
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
Calls for relatively less energy for the smaller product particles, than does the Rittinger law
States that the work required for the crushing is proportional to the new surface created

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