Filtration

A.  Initially, processes are classified according to their cake buildup in a laboratory vacuum leaf filter : 0.10 - 10.0 cm/s (rapid), 0.10-10.0 cm/min (medium), 0.10-10.0 cm/h (slow)
B.  Continuous filtration methods should not be used if 0.35 sm of cake cannot be formed in less than 5 minutes.
C.  Belts, top feed drums, and pusher-type centrifuges are best for rapid filtering.
D.  Vacuum drums and disk or peeler-type centrifuges are best for medium filtering.
E.  Pressure filters or sedimenting centrifuges are best for slow filtering.
F.  Cartridges, precoat drums, and sand filters can be used for clarification duties with negligible buildup.
G.  Finely ground mineral ores can utilize rotary drum rates of 1500 lb/dat ft2 (7335 kg/day m2) at 20 rev/h and 18-25 in Hg (457-635 mm Hg) vacuum.
H.  Course solids and crystals can be filtered at rates of 6000 lb/day ft2 (29,340 kg/day m2) at 20 rev/h and 2-6 in Hg (51-152 mm Hg) vacuum.