Pigments, fillers and dyes are used in a wide variety of applications. This variety of applications corresponds to a large number of specialty products with special properties such as particle shape and particle size. Frequently the particle sizes are in the range of x < 1 μm. The separation properties of these products are therefore different and demanding.

The filtration of pigments, fillers and dyes requires high-performance and, at the same time, product-friendly separation processes. Typical challenges are for example:

  • separation of very fine speciality products
  • highest possible and constant final concentration
  • washing out of residues / reaction products
  • high throughput
  • no product damage
  • separation in a closed process room without air contact
  • continuous operation

BOKELA offers a wide range of high-performance technologies for the filtration of such products. Our BoCross Dynamic, BoCross MicroScreen, BoVac Drum and BoHiBar Drum series have proven themselves in many applications for different products and challenges through outstanding process results and their reliable and cost-effective operation.


  • alumina
  • barium sulfate
  • calcium carbonate
  • ceramic slip
  • kaolin
  • pearlescent pigments
  • silica
  • titanium dioxide
  • zinc sulfate

Main benefits:

  • filtration of fine-grained, sensitive and/or toxic products
  • highly efficient filter cake washing
  • lowest residual moisture
  • high and constant final concentration
  • saving on drying costs or even making thermal drying redundant
  • gas-tight, completely leakproof operation

BoVac Drum filter

Excellent With Regard to Filtration, Washing and Dehumification.

Thanks to their innovative, distinctive profile, BoVac Drum filter are among the most modern and most efficient vacuum drum filters. They are used in various industries. The exchangeable filter cells allow changing the filter cloth during on-going operation.

BoHiBar Drum filter

For Filtration, Washing and Dehumidification of Fine-Grained Products.

If products or processes are challenging, the BoHiBar Drum filter can prove their strength: high specific throughputs, low residual moisture, clean filter cakes. High process pressure and high temperatures are not an obstacle. Contaminations can be easily omitted with the BoHiBar Drum filter.

BoCross Dynamic filter

High Final Concentration and Clear Filtrate.

The range of services of the BoCross Dynamic filter allows micro filtration and ultra filtration of even nanoscale suspensions. The shear gap principle ensures almost ideal physical conditions for the separation process and thus, for the high concentration of suspensions.

BoCross MicroScreen filter

Classification Under Difficult Process Conditions.

Dynamic sieve filtration allows the separation of coarse or fine grain fractions. Highly viscous and concentrated suspensions can be filtered in a closed apparatus with high throughput and sharp separation cut.

Continuous Pressure Filtration

For particularly fine particles, high throughputs and very low residual moisture.

Continuous pressure filtration with a BoHiBar Disc filter is the right solution for products difficult to filter and high suspension amounts, as for example in ore, coal or mineral processing. The BoHiBar Drum filter provides excellent results with regard to filtering and washing fine-grained products and demanding process conditions.

Crossflow Filtration. For Difficult Suspensions

Macro, micro, or nano.

BoCross Dynamic and BoCross MicroScreen are dynamic crossflow filters for micro, ultra, dia or sieve filtration. With the BoCross filter series, suspensions with high concentrations or viscosities can be thickened, washed, cleared or classified.

Filtration, Washing and Dewatering of a Textile Dye Product

The BoVac Drum filter is operated for filtration, washing and dewatering of a textile dye product. The filter is equipped with a wash hood and adjustable wash bars with spray nozzles and with a CIP system for clean & safe operation.

Filtration, Washing and Dewatering of Pigments

Four BoVac Drum drum filters are operated for filtration, washing and dewatering of fine sized tarnishing pigments. Each of these modern 5 m² vacuum drum filters replaces one 8 m² drum filter of old design.

Steam Pressure Filtration of High-Quality Pearlescent Pigments

The BoHiBar drum filter is equipped with exchangeable filter cells and is designed for steam pressure filtration It is operated to filter, wash and dewater fine-grained (x50 < 5 µm) high quality inorganic pigments.

Vacuum Filtration. State-of-the-Art Design for High Performance.

BoVac Disc, BoVac Drum and BoVac Pan – those are continuously working disc, drum and pan filters for vacuum filtration. They are used especially with regard to continuous production processes with high throughputs.

Concentrating and Washing of Titanium

The BoCross Dynamic filter is used for concentrating and washing of a modified and very fine titanium dioxide which has to be further processed.

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