Indexing belt filter (BF)

Gentle filtration of sedimenting media

Filtrate collection pipe with ventilation and vacuum valves on a BHS belt filter
Filtrate collection pipe with ventilation and vacuum valves on a BHS belt filter

The BHS indexing belt filter (type BF) is a continuously operating, horizontal vacuum filter used for the efficient and also gentle separation of sedimenting solids from suspensions. Through various process steps, the filter cake forming on top of the belt can undergo diverse treatments. As a result, the filtrates can be individually recovered and processed. The BHS belt filter thus offers very high process versatility.

An endless belt with a stepwise movement is the filter medium. Feeding of the suspension is usually continuous. The vacuum trays are fixed in place on the frame. The filter cloth with the suspension moves stepwise over the trays. Each time the cloth stops, the filtrate is sucked downwards. Then the vacuum is switched off. This releases the filter cloth, which can be advanced again.

The filter cake forms on top of the belt and can undergo further treatment by washing (co-current or counter-current), reslurrying, steaming, extraction, vacuum drying or pressing. The wash filtrates can be recovered individually from each vacuum tray and further processed without any cross-contamination. The filter cake is discharged at the discharge roller. The cloth is cleaned as the belt returns.

Design variants

Besides the standard open-frame design, we can offer the following optional versions of the vacuum belt filter:

  • Closed hood over the entire filter
  • Closed box design
  • Gas- and pressure-tight box design
  • Pharmaceutical version
  • Pneumatic, hydraulic or electric drive options
  • Materials for special applications
  • ATEX design
Type BF 100-050 indexing belt filter of pharmaceutical design. The pharmaceutical version is certified to EN ISO 22716 and features ground and polished surfaces.
Type BF 100-050 indexing belt filter of pharmaceutical design
Enclosed version of an indexing vacuum belt filter of type BF 150-075B. Depending on the requirements, indexing belt filters of enclosed design are made of stainless steel or plastic, and ensure gas-tightness up to ± 100 mbar.
Enclosed version of an indexing vacuum belt filter of type BF 150-075B
Two BF100-065 indexing belt filters with a custom plastic hood.
Two BF100-065 indexing belt filters with a custom plastic hood
One of the largest indexing belt filters BHS has ever built: a type BF350-210 before delivery in early 2006, featuring a filter area of 73.5 sqm for the production of mineral flame retardants
One of the largest indexing belt filters BHS has ever built: a type BF350-210 before delivery in early 2006

Process criteria:

Operating method continuous
Operating pressure vacuum
Operating temperature up to 90°C
Solids content (suspension) up to 50% (by weight)
Cake thickness up to 50 mm
Grain size 1 - 100 μm
Filter output - suspension up to 10 m³/m² h
Filter output - dry solids up to 1,000 kg/m² h
Active filter surface 0.1 - 144 m²
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Downloads

Brochure "Indexing belt filter (BF)" (PDF / 2.0 MB)
Brochure "Indexing belt filter (BF)"

Product brochure for indexing belt filter (BF) as a continuously operating, horizontal vacuum filter

Size: 2.0 MB
Technical data sheet “Indexing belt filter (BF)” (PDF / 102 KB)
Technical data sheet “Indexing belt filter (BF)”

Technical data on the indexing belt filter (BF) as a continuously operating, horizontal vacuum filter

Size: 102 KB
Filtration application questionnaire (PDF / 129 KB)
Filtration application questionnaire

The PDF form includes a questionnaire that asks for information we require to assess your filtration challenge. The information you provide allows us to plan industrial-scale filters and prepare lab trials, if applicable.

Size: 129 KB

Advantages

  • Continuous and fully automatic operation
  • High process versatility
  • High throughput rates possible
  • Self-contained and gas-tight operation possible
  • Stationary vacuum trays

BHS filtration technical center

Link to tests at BHS technical center

Technical article

Continuous Pressure And Vacuum Filtration Technologies as Alternatives to Batch Filtration Operations

Chemical Industry Digest
Sept 2017
September 2017
PDF (1.8 MB)
Continuous Pressure And Vacuum Filtration Technologies as Alternatives to Batch Filtration Operations

This paper discusses the selection of the filtration process systems: continuous pressure and/ vacuum filtration through a process of laboratory and pilot testing. These tests enable problem analysis, technology selection and scale up which help in optimum filter selection.

Size: 1.8 MB

Treatment of bypass dust in cement manufacturing

ZKG INTERNATIONAL
3 | 2017
April 2017
PDF (694 KB)
Treatment of bypass dust in cement manufacturing

Indexing belt filters from BHS-Sonthofen enable the bypass dust accruing during clinker manufacturing to be completely reincorporated into the process by using up to 100 % of more cost-effective alternative fuels in cement kilns. Reincorporation of the salvaged bypass dust increases cement production by up to 3 %. Proof is provided by a new plant having ...

Size: 694 KB

Cement production: using bypass dust to reduce energy costs

CEMENT INTERNATIONAL
No. 5/2016 (November/December)
November 2016
PDF (1.4 MB)
Cement production: using bypass dust to reduce energy costs

A new method makes it possible to use up to 100 % alternative fuels for clinker production and to recover the resulting bypass dust as a recyclable material. Indexing belt filters from BHS-Sonthofen enable the bypass dust obtained during the production of clinker to be completely reintroduced into the process when using up to 100 % of the more costeffective alternative fuels in cement kilns.

Size: 1.4 MB
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