Drum Filters

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BOKELA drum filters are available with 0.5 to 125m² filtration area.

The biggest drum filters are mainly installed in the processing industry (minerals, salts) whereas the smaller ones are usually operated in the chemical, pharmaceutical and food industry. The filter design varies with the specific process demands.

All the components like the filter cells, filtrate pipes, control head, cake wash system, filter trough and slurry agitator are of most modern design and so care for both excellent hydraulics and a simple maintenance.

Filter Cells of Closed Drum

• 16 to 24 hydraulically optimised filter cells for a quick and complete cell emptying
• the hydraulically optimised cells improve the filtrate drainage and can be removed without any tool
• different cloth fixing systems facilitate the cloth replacement and improve its lifetime
• FrameTrakTM system – a brand-new method of cloth fixing for the simple exchange of individual panels.

Single Cells

Filtrate Piping

Leading and tailing filtrate pipes care for a quick and complete cell emptying as well as for a sharp separation of the mother liquor from the wash filtrate:

• the filtrate pipes are inside the drum for closed drum design
• the filtrate pipes are outside the drum for the single cell design

Control Head

For applications where a huge filtrate flow shall be separated, the control head is designed for the pre-separation that:

• reduces the pressure losses by early separation of the filtrate from the air
• prevents the carryover of the filtrate into the wash and dewatering zone, respectively
• enables the connection of a second cake forming or dewatering zone for a quick adjustment to product changes (option mainly used in the chemical industry where different products are filtered on the same filter).

Cake Wash Systems

In order always to get the best efficiency, the homogeneous distribution of the wash liquid will be done, depending on the wash ratio required:

• with adjustable overflow weirs at high wash liquid flow
• with adjustable wash bars with nozzles at small wash liquid flow.

Cake Discharge Systems

• air blow back with snap-blow valve for dry, friable and not too thin cake
• roller discharge for fine-grained, thin and sticky filter cakes
• discharge knife for very thin cakes filtered on precoat filters
  • cake thickness << 1mm
  • minimum knife feed: 10µm

Complementary Equipment

Automated Operation

The BOKELA drm filters works fully automatically:

• automated filter start and stop
• constantly high throughput
• constant product quality
• high filter availability of over 94%

Filter Sizing

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