Belt filter systems are very versatile and are used in the chemical industry, in pharmacy, the food industry and environmental engineering. They are furthermore ideally suited for the separation of solids from liquids in the manufacturing process of paints and pigments, in the mineral industry as well as in mining and metalworking. The filter media are either continuous filter belts made of different plastic/stainless steel fabrics or filter nonwovens as rolled goods. The filter medium can be arranged horizontally,
inclined or semicircular. Belt filters in basic designs work with gravity. More complex versions can also work with overpressure or reduced pressure/vacuum. There are very small belt filters with filter surfaces of less than one square meter as well as variants with more than 250 m². Best filtration performances are achieved in applications with a solids content of 3 to 40 % at particle sizes between 1 and 100 µm. Here is a short overview of the different variants with filter fleece and filter nonwoven recommendations.
Whereas the inclined bed filter corresponds functionally to a gravity belt filter with additional water column, the volume flow in the hydrostatic filter is further increased by applying a negative pressure. The pressure caused by the water column allows a better utilization of the nonwoven. Therefore, only certain, tear-resistant filter nonwovens are usable.