Page 344 - Chemical Process Equipment - Selection and Design

Feed ~ondition~
Product Pa~a~e~ers Favoring Use
Solids Liquid
in Liquid in Solid Wash* Solids Solids Particle
Product Product Possibilities Concentration Size Bower Space Holdup Bnitiaii Operating Maintenance
Filtration
Vacuum drum F G Ed high to - medium high medium medium high high medium
filter med.
Disc filters F G Pto F medium - fine high medium medium med. to high medium
high
Horizontal F G G to Ed high to - coarse high medium medium medium high medium
filter med.
Precoat filter E P** P to F** very low - slimy high to medium medium high very high medium
med.
Leaf (Kelly) G to Ed F F to G low - fine, med. to medium medium medium very high medium
filter slimy low
Sedimentation

Thickener G to E P P medium dense medium low very vev med. to low very low
0 high high low
U Clarifier G P very P low med. fine very very very med. to low very low
dense low high high low
Classifier P P Pto F medium dense coarse low high high med. to low low
low
Centrifugation
Disc FtoG P P low to med. medium fine high low low high high high
Solid bowl P F Pto F med. to high medium med. to high low low med. to high high
fine high
Basket P to F E Ed med. to high - coarse high low low medium high high

Liquid cyclones
Large P Pto F P low to med. high medium med. to low low very low medium high
low
Small multiple Pto F P very P low med. to fine med. to low low lOW medium medium
high low
Screens P P to F P med. to high - coarse to low very very very medium med. to high
med. low low low
Ultrafiltration E Pto F P low - very fine med. to high high high high very high
high

a P = Poor. F = Fair. G = Good. E = Excellent. * Decantation wash always possible. Displacement wash feasible. ** Solids product contaminated by precoat material.
(Purchas, 1981).