Mechanical Operations
Height of liquid in agitation tank is normally maintained equal to the tank diameter. However, if the tank is too tall and a large liquid hold up is desired, then two or more impellers mounted on the same shaft may be used. The clearance between the tank bottom and the bottom most impeller should be about (where, D = impeller diameter)

D
0.5 D
1.5 D
2 D

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Mechanical Operations
Rittinger's crushing law states that

For a given machine and feed, crushing efficiency is dependent on the size of the feed & product
Work required to form a particle of any size is proportional to the square of the surface to volume ratio of the product
Work required to form a particle of a particular size is proportional to the square root of the surface to volume ratio of the product
Work required in crushing is proportional to the new surface created

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