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
Online contact request
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Downloads

Brochure "Indexing belt filter (BF)" (PDF / 1.2 MB)
Brochure "Indexing belt filter (BF)"

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

Size: 1.2 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 technology" questionnaire (PDF / 27 KB)
"Filtration technology" questionnaire

Questionnaire to describe your filtration application, serves as a specification for drawing up a quotation or performing filtration tests.

Size: 27 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

Cement production: using bypass dust to reduce energy costs

CEMENT INTERNATIONAL
No. 5/2016 (November/December)
November 2016
PDF (646 KB)
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. Reintroduction of the recovered bypass dust increases cement production by up to 3 %. Proof that the method works reliably on a commercial scale has been provided by a new plant with an annual capacity of 20000 t.

Size: 646 KB

Choosing a Fine-Particle Filtration System

Chemical Engineering Progress (CEP)
December 2014
December 2014
PDF (4.4 MB)
Choosing a Fine-Particle Filtration System

Filtration technology has advanced to meet the demand to remove small particles at low concentrations. When designed ocrrectly, a candle filter or a pressure plate filter may be a more-efficient replacement for a traditional filtration scheme.

Size: 4.4 MB

Framework for Selecting Solid-Liquid Filtration Technologies for Particle Fines Removal

Chemical Industry Digest
April 2014
April 2014
PDF (2.6 MB)
Framework for Selecting Solid-Liquid Filtration Technologies for Particle Fines Removal

In the manufacturing of chemicals, petrochemicals, pharmaceuticals, etc., after the initial mixing-reactions, there is always the necessity to remove the mother liquor from the process slurry. In some cases, the liquid is the valuable component, some cases it is the solids and in other cases it is both compounds. The nature of the requirements determines the type of equipment needed for the separation process. This paper provides an overview of separation equipment and then continues with a detailed view of technologies that can remove – recover small particle fines.

Size: 2.6 MB
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