Pressure leaf filter

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Pressure leaf filter

Pressure leaf filter is liquid filtration systems consisting of 10 to 60 leaves that are stacked inside a vertical or horizontal vessel. The leaves are drainage systems that support a wire or textile cloth cover. Pressure leaf filters are mainly divided into vertical pressure leaf filters and horizontal pressure leaf filters.

vertical pressure leaf filter
vertical pressure leaf filter is liquid filtration system consisting of many leaf-shaped filter elements that are stacked inside a vertical vessel.

vertical pressure leaf filter has been specifically designed to provide a large filtration area which is made possible due to the shape of their filter leaf elements. These vertical pressure leaf filter systems produce high filtrate clarity after the clarification run. Different types of filter aids can be used in vertical pressure leaf filters to improve filtrate quality.

Vertical pressure leaf filter

horizontal pressure leaf filter

Horizontal pressure leaf filter
Horizontal Pressure Leaf Filter (shell retraction or bundle retraction) features horizontal pressure vessel, filter leaves, pneumatic vibrator assembly, bottom structure housing, hydraulic power pack for bonnet ring opening / closing and shell or bundle retraction.

The horizontal pressure leaf filter is an enclosed filtration system and can be fully automated. This filter produces a high filtrate clarity after the clarification run and is also suitable for all kinds of filter aids. The regeneration time between the filtration cycles is short. Horizontal pressure leaf filters can also be delivered as tandem units to save floor space. The pressure leaf filter itself has no rotating parts, keeping maintenance to a minimum. These advantages result in an economical filtration solution.

How is the cake discharged ?
In both vertical and horizontal filters the cake can be dried by steam/ hot air and then discharged from the bottom with the help of mechanical / pneumatic leaves vibrator. The whole operation of cake drying takes 30-45 min. and cake discharge takes 5-10 min. For wet cake discharge water spray nozzles are provided. In Horizontal Pressure Leaf Filter wet cake can also be discharged manually by scrapping. The shell is slided out with Hydraulic Mechanism keeping the leaves in fixed position.

How is the Leaf Constructed ?
Each leaf is made of 5-ply of SS wire mesh of different gauge wires. Two outer filtering mesh and three inner are only for support. Different outer filtering mesh is used for different fitleration process. The 5-ply wire mesh are held together by a tubular frame and made leak proof by machine rivetting. The quality of filtration and life of filter depends mainly on the quality of outer wire mesh and revetting. SEPARATECH ensure the quality by inspecting quality of wire mesh and each leaf. Old worn out and torn leaves can be repaired by only replacing the outer weave. Optionally we also provide cloth on the leaves for fine or special filtration.

vertical pressure leaf filter working principle

Vertical pressure leaf filter working principle
The vertical pressure leaf filter is ideal for separating solid from liquid and mainly works on the principle of precoating and pressure. Precoating is done by a suitable filter aid of about 0.5-1% (supercell Hyflo, Bleaching earth, super flow, and so on) mixed with the liquid to be decanted.

Unfiltered liquid is pumped into the vertical pressure leaf filter, and the filter starts creating a precoating layer in filter leaves on both sides. Until the filter is full, this procedure will continue. Once a precoating layer is done, the process of pressure starts and develops a restriction against impurities. And Clean liquid flows from the bottom of the leaf. Once the process is done and the leaves get choked perfectly, the pressure rises . And the output flow almost stops here. After this, the pump is completely stopped, and steam pressure is applied from the apex to filter. The material and squeeze the cake further to remove the liquid. Thus, all the leaves are mounted in the same manifold. And leaves start getting choked from both sides by impurities creating a cake that is in wet form.

The whole process of dry cake takes around 40-45minutes and the cake discharges within 5-10 minutes. It is dried by hot air and discharged from the bottom with the help of a pneumatic leaves vibrator.

Horizontal pressure leaf filter working principle
Leaf Filters are ideal for solid-liquid separation & work on principle of precoating & pressure.
Pre-coating is done with the help of suitable filter aid about 0.5 to 1% (Bleaching earth, diatomite, activated carbon, etc.) mixed with the liquid to be filtered. Unfiltered liquid is pumped into the filter vessel. Initially the filter aid starts forming a precoat layer on both sides of the filter leaves, until then cloudy material comes out of the filter. Once the layer is formed, pressure starts developing, restricting the impurities. Clear liquid flows from both sides into the leaves (filter elements), flows along the tubular channel & gets discharged from bottom of the leaf. All the leaves are mounted on a common manifold. The leaves start getting choked on both the sides by impurities forming cake, which is in wet from. Once the leaves get choked completely, the pressure rises to 3 kg/cm2 & the output flow almost stops. This means the batch size is reached. The pump is stopped & steam / air pressure is applied from the top (without dropping the filter pressure) to filter the material around the leaves held up in the tank & to squeeze the cake further & reduce the liquid retention in it. The holdup unfiltered liquid in the bottom portion is taken back.

Why SEPARATECH ?
SEPARATECH is the pioneer manufacturer of Pressure Leaf Filters in China since past 30 years. Our motto is to see a delighted customer and we try to achieve the same by producting world-class quality services. Our quality and services are justified by our exhaustive client list of hundreds delighted customers.

Food/Beverage
Juice
Beer
Sugar
Vinegar
Edible Oil
Wine
Vegetable Oil
Sweeteners

Petro Refining/Production
Amine: MEA, DEA, TEG
Catalyst Fines Removal
Cooling Water

Metal Finishing/Steel
Pickle Liquor
Electrolyte
Electrogalvanizing Solution
Lithium Processing

Various
Sodium Thiocyanate
Sodium Hypochlorite
Tallow
Carbon Removal
Fly Ash
Condensate
Catalyst Removal
50% Sodium Hydroxide
Sodium Silicate
Potable Water
Water Flooding
(Produced Water)
Biodiesel
Chlor-Alkali
Pharmaceutical

Mining
Merrill Crowe Gold Recovery (Clarifiers)
Soda Ash
Pregnant Liquor (Solutions) – Copper, Nickel,
Zinc, Molybdenum, Lead, Indium, Cobalt
Carbon Fines Removal

Acid
H2SO4, HCL, Nitric, Phosphoric,
Terephthalic, Stearic

Brine
Brine KCL, NaCl, Chlorate, Brine Muds

Molten Sulfur
Dark, light, or bright sulfur

model filter area m2 no. of leaves leaf spacing mm height m height mm vessel vol. L weight Kg
VPLF7 7 9 50 2.2 0.6 0.42 500
VPLF10 10 9 70 2.5 0.8 0.8 800
VPLF12 12 11 70 2.6 0.9 1 900
VPLF15 15 12 70 2.7 1 1.3 1100
VPLF20 20 12 70 3.1 1 1.7 1300
VPLF25 25 13 70 3.2 1.1 1.9 1500
VPLF30 30 15 70 3.3 1.2 2.2 2000
VPLF36 36 15 70 3.4 1.2 2.3 2500
VPLF40 40 16 70 3.5 1.3 2.8 2800
VPLF45 45 16 70 3.6 1.3 2.9 3100
VPLF52 52 16 75 3.8 1.4 3.5 3600
VPLF60 60 17 75 3.9 1.5 4.3 4000
VPLF70 70 18 80 4.4 1.6 5.6 4800
VPLF80 80 20 80 4.5 1.75 7.2 5200
VPLF90 90 20 80 4.7 1.85 7.6 5500

model filter area m2 no. of leaves leaf spacing height mm height mm vessel vol. L floor area occupied mm
HPLF15 15 20 80 1800 900 1.5 6200X2000
HPLF20 20 26 80 1800 900 1.8 6800X2000
HPLF25 25 21 90 2500 1200 2.7 6400X2300
HPLF30 30 25 90 2500 1200 3.4 6800X2300
HPLF35 35 20 100 2700 1400 4.5 7100X2500
HPLF40 40 19 100 2850 1500 4.8 7000X2600
HPLF45 45 18 110 2860 1600 6.4 7200X2800
HPLF50 50 20 110 2860 1600 6.5 7400X2800
HPLF60 60 24 110 2860 1600 6.8 7800X2800
HPLF70 70 22 110 3100 1800 8.2 7600X3000
HPLF80 80 25 110 3100 1800 8.7 8000X3000
HPLF90 90 28 110 3100 1800 9.2 8400X3000
HPLF100 100 31 110 3100 1800 9.7 9200X3000
HPLF120 120 28 120 3300 2000 12.5 9800X3400
HPLF140 140 36 120 3300 2000 15.5 12000X3400
HPLF160 160 36 120 3300 2000 15.5 12000X3400
HPLF180 180 36 120 3300 2000 15.5 12000X3400
HPLF200 200 36 120 3300 2000 15.5 12000X3400

What are the advantages of pressure leaf filter?

= High filtrate clarity

= High yield low product losses

= Large filtration area – small footprint (high headroom)

= No filter cloth – no washing or cloth replacements

= Totally enclosed operation – no contact with air/moisture

= Positive pressure – no vacuum or lowered pressures necessary

= Wet or dry cake discharge

= Possible extraction of the filter cake within the filter

= Easy to automate – operation with minimum labour

= Fast and effective cleaning without manual interference.

= Mechanically simple

= Easy access to the filter leaves for maintenance or extra leaf cleaning

= Intensive cleaning of filter medium is possible

= Improved housekeeping

= Steam heating optional

Advantage of Pressure Leaf Filter over plate & frame filter ?

= Filtration rates are 2-3 times higher on same filter area of plate & frame filter.

= Stainless steel filter elements, hence no repetitive cost, washing and maintenance of filter cloth.

= Automatic cake discharge in very short time without opening the filter from top, hence large saving in labor and time.

= Very low % of unfiltered liquid retention in cake.

= Closed & pressurized operating system hence no spillage & loss of liquid, which helps in handling volatile / inflammable liquids & clean working environment. Entire filtration cycle with cake discharge can be completed without even opening the filter from top.

= Compact & light hence large saving in floor area & supporting structures.

= Pressure leaf filter can be completely automated with no human intervention.
= Pressure leaf filter can be used for getting filtered liquids as well as cake.

What is a pressure leaf filter?

The Pressure Leaf Filter is a MS/SS Vertical / Horizontal Vessel with Filter Leaves inside. The leaves are mounted vertically on a common manifold pipe, through which the filtered liquid flows out. On the top, the leaves are held by a vibrating shaft . A mechanical vibrator driven by electric motor/pneumatic vibrator is provided for vibrating the leaf shaft for cake discharge. Jacket for hot filtration can be offered if desired Over flow, vent/steam/air charging, pressure gauge & safety valve are provided on the top.

What does pressure filter mean?

Pressure leaf filters are liquid filtration systems consisting of 10 to 60 leaves that are stacked inside a vertical or horizontal vessel. The leaves are drainage systems that support a wire or textile cloth cover.

How much does the pressure leaf filter cost?

The price of the pressure leaf filter mainly depends on the material and the size of the filter, as well as the filter screen specifications. SEPARATECH always strives to provide users with high-quality filters at reasonable prices.