The size of mechanical classifier required for a particular job depends on the following factors:
- Tons of dry solids to be overflowed per 24 hours. This is simply a predetermined tonnage.
- Mesh size at which separation is to be made. The mesh size is determined by laboratory tests or is already known from previous experience.
- Density desired in the overflow. This is dependent upon subsequent treatment.
- Settling rate of solids, of the size at which separation is desired, in pulp of the particular density of the proposed installation. This is determined by laboratory settling tests.
Overflow Capacity of the Mechanical Classifier
If the settling rate has been determined by laboratory tests the classifier pool area required is obtained from the following formula:
Effective pool area, sq. ft. = Vol. overflowing, cu. ft. per min/Settling rate, ft. per min.
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