The BoHiBar drum filters are equipped with exchangeable filter cells and are designed for steam pressure filtration The filters are operated to filter, wash and dewater fine-grained (x50 < 5 µm] high quality inorganic pigments that are manufactured to different specifications and must all be filtered on the same filter units.

The BoHiBar drum filters achieve a cake moisture of < 20 % while parallel running conventional pressure filters achieve a moisture content of 30–35 %. This means a water reduction by steam pressure filtration of 280 kg per t solids. More than 2 kg water is removed from the filter cake per 1 kg steam applied which means a serious reduction in energy costs.

The BoHiBar drum filters can be quickly prepared for a product change thanks to exchangeable filter cells which allow an unparalleled quick re-clothing, and thanks to an automatically opening pressure vessel and excellent accessibility. This results in significantly reduced personnel costs for maintenance and cleaning.

BoHiBar Drum Filter S4 with exchangeable filter cells

Units installed

­

2

Filter area per unit

[ m² ]

4

Material of construction

 

1.4571

Power of filter drive

[ kW ]

0.25

Year of commissioning

 

2003 (unit 1), 2009 (unit 2)

 

Process and Operation Data

Solids throughput

[ kg DS/h ]

140 - 350

Solids content in filtrate

[ wt.-% ]

free of particles

Cake moisture

[ wt.-% ]

< 20

Steam per ton solids

[ kg/t ]

30 - 50

Operation pressure

[ bar (g) ]

3.5

Time for change of filter cloth

[h]

1-2

 

Product Data

Product

 

High-quality pearlescent pigments

Medium particle size

[ µm ]

< 5

Temperature

[°C ]

80

 

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