The working principle of the box filter press is composed of filter plates arranged to form filter chambers (the sides of the filter plates are indented inward, and two filter plates combine to form a box-shaped filter chamber).
The filter plate surface features pits and raised platforms to support the filter cloth. There are through-holes in the center and corners of the filter plate, which, upon assembly, form a complete passage for the suspension liquid, wash water, and the extraction of filtrate. Each side of the filter plate has a handle supported by a crossbeam, and the filter plate is clamped tightly by a clamping device. The filter cloth between the filter plates serves as a seal.
Under the pressure of the feed pump, the material liquid to be filtered is sent into each filter chamber, where it is separated from solids and liquids through the filtering medium (suitable filter cloth selected based on different industries). Sludge forms on the filter cloth until it fills the filter chamber to create a filter cake. The filtrate passes through the filter cloth and flows along the filter plate grooves to the lower outlet channel, where it is discharged collectively. After filtering, the filter cake can be washed with cleaning water. After washing, compressed air may be introduced to remove any remaining cleaning liquid. Once the filtering is complete, the pressure filter is opened to remove the filter cake (stored between adjacent filter plates), the filter cloth is cleaned, and the plate filter is re-tightened to begin the next work cycle.