The filtering and washing time per cycle to obtain maximum filtrate per day if both are carried out at a constant pressure of 30 psig
PARTICULATE SOLIDS FLOW AND SEPARATION THROUGH FLUID
22.44. A through-washing plate-and-frame filter press
is to be used to filter a slurry containing 2 weight percent
of precipitated calcium carbonate, the particles of which
average 10 microns in diameter. Laboratory tests show that
the cake particles have a sphericity of about 0.8 and that
100 cm3 of cake retain 40 cm3 of filtrate. In operation, the
volume of wash water to be used each cycle will be 5
percent of the volume of filtrate collected. Thirty minutes
are required to durnp and reassemblethe press each cycle.
Assuming that the cake is incompressible and that the
filtrate has the same properties as the pure water used in
washing and neglecting the resistance of the filter cloth and
delivery lines, compute:
a) The filtering and washing time per cycle to obtain maximum filtrate per day if both are carried out at a
constant pressure of 30 psig
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