Page 369 - Chemical Process Equipment - Selection and Design

332 SOLID-LIQUID SEPARATION

TABLE 11.17. Operating Data of Some Vacuum Filter Applications
Applico t ion Type of vocuum Solids content Solids hondling Moirure Air ow
filter frequency of feed, wt/wt rate, kg dry content of m3 h-' m-{ Vocuutn,
usedb solids h-' rn-l cake, wt/wt filter surfaced mmHg
filter surfocec
~-
~~ ~ ~~~~ ~~
Chemicals
Alumina hydrate Top feed drum 40 450-750 I5 90 125
Barium nitrate Top feed drum 80 1250 5 450 250
Barium sulphate Drum 40 50 30 18 Mo
Bicarbonate of soda Drum 50 I750 12 540 ux)
Calcium carbonate Drum 50 125 22 36 500
Calcium carbonate (precipitated) Drum 30 1 50 40 36 550
Calcium sulphate Tipping pan 35 600 30 90 450
Caustic lime mud Drum 30 750 50 108 375
Sodium hypochlorite Belt discharge drum I2 I50 30 54 500
Titanium dioxide Drum 30 125 40 36 500
Zinc stearate Drum 5 25 65 54 So0
Minerals
Frothed coal (coarse) Top feed drum 30 750 18 72 300
Frothed coal (fine) Drum or disc 35 400 22 54 375
Frothed coal tailings Drum 40 200 30 36 550
Copper concentrates Drum 50 300 IO 36 525
Lead concentrates Drum 70 IO00 12 54 550
Zinc concentrates Drum 70 750 10 36 500
Flue dust (blast furnace) Drum 40 I so 20 54 500
Fluorspar Drum 50 IO00 12 90 315
Notes:
The information given should only be used as a general guide, for slight differences in the nature, size range and concentration of solids, and in the nature and
temperature of liquor in which they are suspended, can significantly affect the performance of any filter.
It should not be assumed that the type of filter stated is the only suitable unit for each application. Other types may be suitable, and the ultimate selection will
normally be a compromise based on consideration of many factors regarding the process and the design features of the filter.
The handling rate (in kg h" m-*) generally refers to dry solids except where specifically referred to as filtrate.
The air volumes stated are measured at the operating vacuum (Le. they refer to attenuated air).

(Osborne, 1981).