Indexing belt filter (BF)
Gentle filtration of sedimenting media
- Two BF100-065 indexing belt filters with a custom plastic hood
- Filtrate collection pipe with ventilation and vacuum valves on a BHS indexing belt filter
The BHS indexing belt filter (type BF) is a continuously operating, horizontal vacuum filter used for the efficient separation of sedimenting (incl. abrasive) solids from suspensions. The individual filtrates are kept entirely separate to avoid cross-contamination.
An endless belt with a step-wise 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 in step fashion over the trays. Each time the belt stops, the filtrate is sucked downward by the vacuum. 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, suction 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 end roller. The cloth is cleaned as the belt travels back.
Besides the open-frame design, we can offer the following optional versions:
- Closed hood over the entire filter
- Closed box design
- Gas- and pressure-tight box design
- Pharmaceutical design
- Pneumatic, hydraulic or electric drive options
- Materials for special applications
- ATEX design
- Belt filter with continuously moving belt
- One of the largest indexing belt filters BHS has ever built: a model BF350-210 before delivery in early 2006, featuring a filter area of 73.5 sqm for the production of mineral flame retardants
Process criteria:
| Mode of operation | continuous |
|---|---|
| Operating pressure | vacuum |
| Operating temperature | up to 90 °C |
| Solids content (suspension) | up to 50% (weight) |
| Cake thickness | up to 50 mm |
| Particle size | 1 - 100 μm |
| Filtration capacity (suspension) | up to 10 m³/m² h |
| Filtration capacity (dry solid) | up to 1,000 kg/m² h |
| Active filter area | 0.1 - 120 m² |
