A filter press is a separation process equipment used for solid-liquid separation. It operates by applying pressure to a mixture of solid and liquid (slurry) through a series of filter plates and filter cloths. The slurry is pumped into the filter chamber by a feeding pump, and the solids are retained on the filter cloths, forming a filter cake, while the filtrate (liquid) passes through the filter plates and is discharged for further processing or disposal.
The main components of a filter press include:
1. Filter Plates: These are rigid plates with filter cloths attached to them. The plates are arranged in a stack and have channels or holes for the passage of filtrate.
2. Filter Cloths: These are porous materials that allow the passage of liquid while retaining the solid particles. They are attached to the filter plates and form the filtration media.
3. Hydraulic System: A filter press typically uses a hydraulic station to apply pressure to compress the filter plates. The pressure helps to dewater the slurry and facilitate the separation of solids and liquids.
4. Feeding Pump: It is used to pump the slurry into the filter press.
5. PLC control panel. The control panel controls the filter press close, open procedures, and also some extra functions such as filter cloth washing, filter plate auto opening, and drip tray opening/closing.
The filtration process in a filter press involves several stages, including slurry filling, filtration, cake washing (optional), and cake discharge. Once the filtration cycle is complete, the filter cake can be further processed, such as drying, disposal, or further treatment, depending on the application.
Filter presses are widely used in various industries, such as mining, chemical, pharmaceutical, wastewater treatment, and food processing, for applications such as dewatering, sludge treatment, clarification, and particle separation. They offer efficient solid-liquid separation, high solids recovery, and the ability to handle large volumes of slurry.