Filter press is a solid-liquid separation equipment, whichFilter press is a solid-liquid separation equipment, which are most commonly used filtration equipments.
are most commonly used filtration equipments.
It has been used successfully in almost every industrialIt has been used successfully in almost every industrial filtration application over
filtration application over its 150 years of its 150 years of historyhistory..
Filter presses operate at very high pressures (from 5 to 15Filter presses operate at very high pressures (from 5 to 15 bars and sometimes even more).
bars and sometimes even more).
A feeding pump is utilized to force the liquid
A feeding pump is utilized to force the liquid
throu
In filter presses, filter medium
In filter presses, filter medium
is a textile
is a textile
fabric, such as canvas cloth, woven heavy
fabric, such as canvas cloth, woven heavy
cloth, glass cloth, metal cloth and woolen
cloth, glass cloth, metal cloth and woolen
cloth.
Types of filter press
Types of filter press
Plate & frame filter press
Plate & frame filter press
Belt filter press
Belt filter press
Rotary drum filter press
Rotary drum filter press
PLATE & FRAME FILTER PRESS
PLATE & FRAME FILTER PRESS
Plate & frame filter press contains a set of
Plate & frame filter press contains a set of
plates and frames designed to
plates and frames designed to
provide a series
provide a series
of chambers in which solids may collect.
The plates are covered with a
The plates are covered with a
filter medium such
filter medium such
as canvas.
as canvas.
The
The plates
plates
and fr
and frame of
ame of a filter
a filter press
press may be
may be
square or circular,
square or circular,
which are made
which are made
of cast iron, stainless steel,
of cast iron, stainless steel,
Aluminum, lead,
Aluminum, lead,
wood
wood
& hard rubber.
& hard rubber.
Plates and frames set vertically in a metal rack, withPlates and frames set vertically in a metal rack, with cloth covering the face of each plate, and
cloth covering the face of each plate, and are squeezedare squeezed tightly together by a screw or a hydraulic ram.
Slurry enters at one end of the assembly Slurry enters at one end of the assembly of platesof plates
and frames.
and frames.
It passes through a channel running lengthwiseIt passes through a channel running lengthwise
through one
through one corner of tcorner of the asshe assemblyembly..
The solids are deposited on The solids are deposited on the cloth-covered facesthe cloth-covered faces
of the plates and liquid
slurry is admitted from a pump
slurry is admitted from a pump
or pressurized tank
or pressurized tank
usually at a pressure of 3 to 10 bar.
usually at a pressure of 3 to 10 bar.
Filtration is continued until liquor no longer flows out
Filtration is continued until liquor no longer flows out
the discharge.
Belt filter press
Belt filter press
Belt filter press
Belt filter press
(sometimes called a belt
(sometimes called a belt
filter) is an industrial machine, used for
filter) is an industrial machine, used for
solid-liquid separation process. The process of
liquid separation process. The process of
filtration is primarily obtained by passing a pair
filtration is primarily obtained by passing a pair
of filtering cloth and belt through a system of
of filtering cloth and belt through a system of
rollers.
Belt filter press
The feed is introduced from a hopper between two The feed is introduced from a hopper between two
filter cloths (supported by perforated belts) which pass
filter cloths (supported by perforated belts) which pass
through an arrangement of rollers.
through an arrangement of rollers.
feedfeed is sandwiched between two filter cloths (shownis sandwiched between two filter cloths (shown
green and purple).
green and purple).
As the belts are fed through the rollers, liquid iAs the belts are fed through the rollers, liquid iss
squeezed out .
squeezed out .
Fluid is extracted initially by gravity, then byFluid is extracted initially by gravity, then by
squeezing the cloth through rollers.
When the belts pass through the final pair of rollersWhen the belts pass through the final pair of rollers
in the process,
in the process, FiltrateFiltrate exits through a drain, theexits through a drain, the
filter cloths are separated and the filter cake is
filter cloths are separated and the filter cake is
scraped off into a suitable container.
scraped off into a suitable container.
Belt filter press is generally used in
Belt filter press is generally used in
phosphatphosphatic fertilizer ic fertilizer plantsplants
Dewatering of sludge’s in the Dewatering of sludge’s in the chemical industrychemical industry
Rotary-drum-filter press
Rotary-drum-filter is used for those slurries that
Rotary-drum-filter is used for those slurries that
form a non-pours cake.
A filter medium, such as canvas, covers the face of the drum,A filter medium, such as canvas, covers the face of the drum, which is partly submerged in the liquid.
which is partly submerged in the liquid.
Under the slotted cylindrical face of the main drum is aUnder the slotted cylindrical face of the main drum is a
second, smaller drum which is connected by an internal pipes to second, smaller drum which is connected by an internal pipes to pump.
pump.
In this picture, drum face is perforated through which liquidIn this picture, drum face is perforated through which liquid is transfer to internal drum.
As drum dips under the surface As drum dips under the surface of the liquid, A layer of of the liquid, A layer of
solids builds up on the face of
solids builds up on the face of the panel as liquid is drawnthe panel as liquid is drawn
through the cloth into the
through the cloth into the compartment, through the internalcompartment, through the internal
pipe into collecting tank. A pump is
pipe into collecting tank. A pump is attached to central ductattached to central duct
to extract the filtrate from drum.
to extract the filtrate from drum.
Advantages
Advantages
Little manpower is requiredLittle manpower is required
Constant cake productionConstant cake production
Low overall capital costLow overall capital cost
Small spaceSmall space
Low overall energy consumptionLow overall energy consumption
Low noiseLow noise
Applications
Applications
Centrifuge filter press
Centrifuge filter press
Solids that form a porous cake can be separated from Solids that form a porous cake can be separated from a slurry by centrifuge filter press.
It operates batchwise or in continuous fashion.
Slurry is feed to a rotating basket having a perforated wall covered with a filter medium such as metal
cloth.
The shaft rotates at speed between 600 to 1800 rpm.The shaft rotates at speed between 600 to 1800 rpm.
The liquor passes through the filter medium and the solids areThe liquor passes through the filter medium and the solids are retained by the medium.
retained by the medium.
The cake is discharged by cutting it out with an unloader knife.The cake is discharged by cutting it out with an unloader knife. Applications of
Applications of Centrifuge filter pressCentrifuge filter press::
TTo clean all to clean all types of lubricating oil,ypes of lubricating oil, Ship, Vehicle, Generator Ship, Vehicle, Generator ,, etc.
etc.