Vacuum Drum Filter Overview
Drum Filters are used for continuous, mechanical separation of
large quantities of solid and liquid mixtures by filtering them
in a vacuum. Typical areas of application include Mining,
Chemicals and Food production.
Vacuum Drum Filters provide a wide range of liquid-solids
separation for many types of industrial applications. Our units offer the operating flexibility to handle dewatering,
washing and clarification applications, or a combination of the
Pure Drum Filters are available with drums up to 13.5 ft
in diameter and 36 ft in length and are built to customer
Rotary Vacuum Drum Filter Designs Include:
Scraper Discharge is
the most common drum filter discharge. After dewatering, the
cake is removed from the Filter Cloth by a scraper blade just
prior to the re-submergence of the drum. The scraper serves
mainly as a deflector to direct the cake, dislodged by an air
blowback, into the discharge chute.
Pre-coat Discharge is best applied to processes which have
relatively low concentrations of solids or produce filter cakes,
which effectively blind the filter media.
Roll Discharge is especially good for thin, sticky cakes
which have the unique property of sticking to themselves. The
filter cake on the drum is pressed against a discharge roll
packed with filter cake, so that the thin cake is pulled or
peeled from the drum. Solids are removed from the discharge roll
with a knife blade.
String Discharge best applies to thin cakes and materials
that are unstable, and if disturbed too much will change from a
solid to a liquid. Most generally applied in the Starch and
Pharmaceutical Industries, is a system of endless strings or
wires spaced about 0.5 inches apart that pass around the Filter
Drum, but are separated tangentially from the Drum at the point
of cake discharge. The strings return to the drum surface guided
by two rollers with the cake separating from the strings as they
pass over the rollers.
Belt Discharge offers the ability to discharge filter
cakes and wash both sides of the filter cloth with each drum
Pure Belt Discharge Drum Filters offer the ability
to discharge filter cakes and wash the filter media with each
drum rotation. Many applications using this type of filter
produce thin, sticky and wet filter cakes which are not easily
discharged without the aid of a discharge roll.