Horizontal Band Filters are, in broad terms, the most commonly used filters in the industry due to their flexibility of operation, adaptation to corrosive slurries and suitability to handle large throughputs.
An endless rubber band with traversing grooves drains the filtrate towards holes positioned along the belt. The sides of the belt have elastic rubber shrouds that contain the incoming slurry and then the cake as it moves towards the discharge end. Synthetic plies encapsulated in the rubber part below the grooves serve to withstand the longitudinal stresses to which the band is subjected.
The Filter Cloth
The filter cloth retains the cake and moves together with the band. They are made from synthetic materials such as polypropylene or polyester with monofilament or multifilament yarns and with sophisticated weaves.
- Various dimensions
- Completly automatic
- Flexibility of operation
- Adaptation to corrosive slurries
How does it work?
The water enters into the filter and is immediately incercepted by a diffuser. This diffuser uniformly disperses the water in all directions within the tank. Before the water flows out vertically from the lower part of the tank it must pass through a fabric filter mechanically supported by the band. Any solid particles with a granulometry larger than the fabric's porosity are therefore trapped.
The filtration is also effective due to the hydrostatic head created inside the tank which increases the belt's clogging. Therefore, once a certain level of clogging has been reached, the belt must undergo renewal.
This takes place automatically due to the presence of a float that controls the moving belt's vari-speed motor which works via a timed telecontrol. The clogged fabric is withdrawn from the front of the machine via a cylinder.