Filter Press

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Filter press is a solid-liquid separation equipment, which are most commonly used filtration equipments. 

It has been used successfully in almost every industrial filtration application over its 150 years of history history.. Filter

presses operate at very high pressures (from 5 to 15  bars and sometimes even more). 

A feeding pump is utilized to force the liquid through throu gh the medium leaving the solid trapped

In

filter presses, filter medium is a textile fabric, such as canvas cloth, woven heavy cloth, glass cloth, metal cloth and woolen cloth.

 Types of filter press Plate

Belt

& frame filter press

filter press

Rotary

drum filter press

Centrifuge

filter press

PLATE & FRAME FILTER PRESS

Plate & frame filter press contains a set of  plates and frames designed to provide a series of chambers in which solids may collect.

 The

plates are covered with a filter medium such as canvas.  The plates and frame frame of a filter press may be square or circular, which are made of cast iron, stainless steel, Aluminum, lead, wood & hard rubber.

Plates and frames set vertically in a metal rack, with cloth covering the face of each plate, and are squeezed tightly together by a screw or a hydraulic ram. 

Slurry

enters at one end of the assembly of plates and frames. It passes through a channel running lengthwise through one corner of the t he assembly ass embly..

 The

solids are deposited on the cloth-covered faces of the plates and liquid passes through the cloth.



slurry is admitted from a pump or pressurized tank  usually at a pressure of 3 to 10 bar. 

Filtration is continued until liquor no longer flows out the discharge.

Belt filter press Belt filter press (sometimes called a belt filter) is an industrial machine, used for solidliquid separation process. The process of  filtration is primarily obtained by passing a pair of filtering cloth and belt through a system of  rollers.

Belt filter press

 The

feed is introduced from a hopper between two filter cloths (supported by perforated belts) which pass through an arrangement of rollers. is sandwiched between two filter cloths (shown green and purple). feed

As

the belts are fed through the rollers, liquid is is squeezed out . Fluid

is extracted initially by gravity, then by squeezing the cloth through rollers.



When the belts pass through the final pair of rollers in the process, Filtrate exits through a drain, the filter cloths are separated and the filter cake is scraped off into a suitable container.

Belt filter press is generally used in   

phosphatic fertilizer plants phosphatic Dewatering of sludge’s in the chemical industry Mining of ores and water treatment.

Rotary-drum-filter press

Rotary-drum-filter is used for those slurries that form a non-pours cake.

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A filter medium, such as canvas, covers the face of the drum, which is partly submerged in the liquid. 

Under the slotted cylindrical face of the main drum is a second, smaller drum which is connected by an internal pipes to  pump. 

In this picture, drum face is perforated through which liquid is transfer to internal drum.

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As drum dips under the surface of the liquid, A layer of  solids builds up on the face of the panel as liquid is drawn through the cloth into the compartment, through the internal pipe into collecting tank. A pump is attached to central duct to extract the filtrate from drum. 

The drum rotates normally from 1 to10 RPM.

Advantages Little

manpower is required

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Constant cake production

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Low overall capital cost



Small space



Low overall energy consumption



Low noise

Applications

Centrifuge filter press

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.  Pressure resulting from the centrifugal action.

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The shaft rotates at speed between 600 to 1800 rpm.

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The liquor passes through the filter medium and the solids are retained by the medium. 

The cake is discharged by cutting it out with an unloader knife.

Applications of Centrifuge filter press: To

clean all types t ypes of lubricating oil, Ship, Vehicle, Generator ,

etc. It

is used in sugar refining.