Shows a LENZING CakeFil installation
Shows a LENZING CakeFil housing
Shows a cross-sectional view of a LENZING CakeFil wet discharge candle
Shows a cross-sectional view of a LENZING dry discharge candle

LENZING CakeFil

Filtration's Finest

The LENZING CakeFil system is a process candle filter for cake building filtration with slurry or dry discharge. Its patented system enables highly efficient backwashing, thereby extending the service life of the filter fabric.

Advantages

Filtration down to submicron range
Dry or slurry discharge
Efficient cake discharge
Unbeatable cloth service life
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Unfiltered medium enters the filter via the feed nozzle [1] and is distributed via the feed chamber [2]. It passes through the filter cloth and the filter candles [7] from the outside to the inside and leaves the candles again via the head plate [3] into the filtrate chamber [4] before leaving the filter completely via the filtrate nozzle [8]. The solids form a permeable “filter cake” on the cloth.

The filtrate chamber is drained through the filtrate nozzle [8] and the upper part of the feed chamber is drained through the feed drain nozzle [5] to its level. The complete filter is pressurized with air or nitrogen. A sudden release of pressure through the pressure relief nozzle [6] forces a rapid reverse flow of filtrate through the filter cloth from inside to outside. This results in an effective removal of the filter cake, which is resuspended in the fluid inside the feed chamber. It also removes solids from inside the pores of the filter cloth. The homogenous slurry is discharged through the bottom drain nozzle [9].

Technical data

Possible max. configuration (depending on customer requirements)
Flow rate> 1000 m³/h
Operating temperature110°C (higher possible upon agreement)
Solids content10%w
Area of application (viscosity)Filtration of low to medium viscosity media
Flux (throughput per filter surface) 4 m³/m²h
Filter surface wet discharge (per filter) 356 m²
Shows six detailed images of filter cloths

Filter cloth

Various filter materials are available for each individual application, with pore sizes down to 1 micron for temperatures up to 180°C.

PP Mono | Monofilament
PP Multi | Multifilament
PP Mono | Multifilament
PPVDF | PTFE Mono | Monofilament
PPS Multi | Multifilament
PVDF Mono | Multifilament

Filter aids

For solids that are difficult to filter or if adsorption of components of the fluid is needed, various filter aids can be used for basic precoat and/or dosed to the fluid as so called "body feed".
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Cellulose

Available as natural wood fibers, extract free fibers and highly pure fibers for food and pharma applications

Shows a microscope image of diatomaceous earth

Diatomite

Agglomerated fossilized residues of diatoms

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Perlite

Volcanic material used in chemical and food industry

Shows activated carbon ground

Activated carbon

For removal of hydrocarbons, chlorine or
other unwanted dissolved components
by adsorption

The patent-pending design of the LENZING CakeFil filter candles achieves unprecedented efficiency in removing particles from the pores of the filter cloth.

A test with various filter candles and fine-grained solids has shown that the weight of remaining (non-backwashable) particles in the pores of the filter cloth can be reduced by 80% compared to filter candles used to date.

Further product information

Uniform filter cake over the entire length of the candle, efficient cake discharge, and extended service life of the filter material.

The LENZING CakeFil system enables true process automation without downtime or manual operation. Its high-quality material designs allow it to be used in a wide variety of industries and applications.

  • Petrochemical products

  • Acids, lye, solvent

  • Brine

  • Lubricoolants

  • Sugar solutions

  • Catalyst recovery

  • Mining

  • Process waste water

  • Slurry discharge: 1.7 m², fully automatic

  • Dry discharge: 1.2 m², fully automatic

  • Dry/slurry discharge: 0.1 m², fully automatic

  • Dyr/slurry discharge: 0.1 m², manually

  • Stainless steel

  • Duplex or Super Duplex

  • Carbon steel

  • Carbon steel rubber lined (on inside)

  • Inner parts completely out of plastic (metal-free)

FAQs and contact

Get personalized advice and contact us. The following FAQs will give you an initial insight into LENZING CakeFil expertise.

In cake building filtration a permeable cake forms on the filter medium during the filtration process. This filter cake consists of separated solid particles and performs the filtration task, while the liquid purified phase is collected separately.

The filter cake grows over time, increasing the flow resistance and decreasing the filtration speed. Once a certain cake thickness is reached, filtration is stopped and the solids formed are discharged from the filter medium.

In many applications, the cake is further processed by washing or drying to increase purity or remove residual materials.

Cake buidling filtration with a candle filter is characterized above all by the highly effective separation of solids from liquids. Fully automated CakeFil systems offer a wide range of applications thanks to their compact design.

The closed design prevents product losses and enables highly efficient pressure-driven backwashing.

The round filter cake on the filter candle provides optimal conditions for washing and drying the separated solids.

The separation of solids depends on the solid to be filtered and the filter aid used.

Under optimum conditions, particle sizes smaller than 1 µm can be filtered. This is required, for example, in protective filtration prior to membrane filtration.

When considering a single CakeFil, we refer to discontinuous operation. During the pre-coat phase and solids discharge, filtration is stopped and the medium to be filtered is buffered in an upstream tank.

A CakeFil system is usually designed so that the buffered quantity is compensated by the filtration capacity.

However, complete continuity can be achieved through parallel installations.

Maintenance activities are mainly limited to replacing the filter cloths.

The service life of filter cloths depends heavily on the solids being filtered, but can be up to several years.

The filter candles themselves form the support structure for the filter cloth and can be reused.

Innovation Flows

Interested in further solid-liquid filtration solutions made in Austria?