A filter press is an industrial tool used to separate liquids and solids by way of pressure filtration. This process is particularly useful in processing materials such as wood, food, chemical manufacturing, and aggregates. In this blog post, we will discuss what a filter press is and how it works.

What is a Filter Press?

A filter press is a piece of equipment that uses pressure filtration to separate liquids from solids. It consists of several frames or plates with recessed chambers in between them. Each frame contains a cloth filter, which acts as the medium for separating out particles from the liquid being filtered.

As the liquid passes through the cloth, the solid particles are caught on the surface of the cloth while the liquid is allowed to pass through. The frames are then pressed together using hydraulic pistons to form a tight seal that prevents any liquid from seeping out during filtration.

How Does A Filter Press Work?

The first step in using a filter press is to feed slurry (a mixture of solid and liquid) into one end of the machine. The slurry is pumped through each chamber as it moves down its length, with each chamber having its own cloth filter.

Modern Filter Press

As the slurry passes through, more of the solid material becomes trapped on the surface of the cloths while allowing only clean liquid to pass through into another chamber below it. This allows the solid liquid separation.

Filter Presses

This process continues until all of the chambers have been filled up with both clean liquid and trapped solid material. After all, chambers have been filled up, hydraulic pistons are used to press down on them to compress them tightly together so that no more liquids can escape from any of them during the filtration process.

Finally, when all chambers have been compressed together completely, they can be opened up again and emptied out so that any remaining solids can be removed from inside them for disposal or reuse purposes.

Filter Press Components

A filter press is a machine used for separating solids and liquids. It is composed of several components, including the frame, filter plates, and cloths that are essential for its operation. Understanding how each filter media of a filter press works can help you decide if it’s the right tool for your industrial processes. Here is a list of the filter elements.

Frame Filter Press

The frame of a filter press is the largest component and acts as the support structure for all other parts. The frame can be made out of stainless steel, carbon steel, alloy steel, or cast iron depending on the application and environment in which it’s being used. It also determines the size of the filter press; larger frames lead to higher capacities while smaller frames offer more control over filtration processes.

Filter Plates

Filter plates are located inside the frame and contain various openings that allow liquid to pass through while trapping solids on one side. These plates vary in design depending on their intended purpose; some can handle high pressure while others are designed for greater filtration efficiency. Filter plates also come in different materials such as rubber, plastic, or metal alloys that are tailored to specific industrial processes.

Filter Cloths

Filter cloths are placed between each pair of filter plates on either side and act as the primary filtration medium. A filter cloth in different sizes and thicknesses depending on what type of material needs to be filtered out. Filter Cloths also have various coatings such as silicone-coated fabrics that allow them to resist extreme temperatures or corrosive chemicals during filtration operations.

Filter Cake

A filter cake is a solid layer of material that forms on top of the filter medium during filtration. As liquid passes through the filter medium, particles in the liquid become suspended in the pores of the medium and begin to accumulate until they form a solid layer known as “filter cake”. The thickness of this layer depends on several factors such as particle size, flow rate, and type of material being filtered.

Additional Filter Press Main Components

  • Filter Press Feed Pump
  • Filter Chambers
  • Feeding Pump
  • Centrifugal Pump
  • Filter Pack
  • Feed Pumps
  • Hydraulic Cylinder
  • Flow Meter
  • Air Blow Component
  • Pressure Gauge
  • Drip Trays
  • Plate Shifter
  • Recessed Plate
  • Safety Light Curtains

The Role Of Filter Cake In Filtration Processes

Filter cakes play an important role in filtration processes because they act as both an additional barrier between particles and your desired product, as well as helping to reduce clogging of the media pores.

Cake Washing

The presence of a thick enough filter cake helps to create an efficient barrier between particles which prevents them from passing through and contaminating your desired product. In addition, when particles become lodged in the pores of your media, they cause clogging which can lead to reduced efficiency or even complete system failure if not addressed quickly enough. This is caused a cake discharge or cake wash.

By forming a thick enough layer on top of your media, you can help reduce this risk by preventing new material from entering into already-clogged pores while still allowing liquid to pass through freely.

Industries Who Use Filter Presses

A filter press is a versatile piece of equipment used in industrial processes for liquid and solid separation. It is made up of chambers containing fabric filters that can be filled with a slurry, or mixture of liquid and solid particles, and then compressed to remove the liquid.

Food Processing Industry

One area where filter presses are being used more and more is food processing. Food production is an incredibly important industry, but it also produces large amounts of waste water containing suspended solids. Filter presses are used in food processing to separate these solids so that the wastewater can be safely discharged into the environment. They are also used to purify vegetable oil and extract essential oils from plant material.

Mining Industry

The mining industry requires a lot of water for its operations – both for washing ore and for use in process water systems such as cooling towers, dust suppression systems, and tailings ponds. The large volumes of wastewater generated by mining operations often contain suspended particles which must be removed before the water can be discharged back into the environment or reused elsewhere in the mine. This is where filter presses come in; they are used to dewater slurry from gold extraction processes, coal washing plants, iron ore beneficiation plants, and other mineral processing plants.

Chemical Processing Industry

Filter presses are also commonly used in chemical process applications such as purifying chemicals, recovering active ingredients from spent solutions, and separating emulsions into their component parts. They can help ensure that any hazardous materials present in chemical processing operations are safely removed before they enter the environment or cause harm to personnel handling them.

Power Generation Industry

A filter press is an essential tool in the power generation industry, as it helps to reduce the amount of suspended solids in water and other liquids used during power generation processes. Filter presses are used to dewater liquids prior to reuse or discharge, allowing only clean water to be recycled back into the system. This ensures that electricity-generating plants operate safely and efficiently without any environmental issues due to pollutants entering the ecosystem.

Additionally, filter presses remove pollutants such as oil and grease from cooling tower makeup water, helping to maintain optimal cooling performance and avoiding breakdowns or shutdowns due to equipment failure from contaminated water. Using a filter press in the energy sector allows for better management of operations with more efficient water use, leading to cost savings across the entire operation.

Aggregates, Asphalt and Cement Production Industry

A filter press is a powerful tool used by the Aggregates, asphalt and cement production industry to efficiently sift out moisture and other impurities from their raw materials. This equipment applies pressure so that suspended solids are quickly removed from liquid or slurry mixtures, leaving behind clean liquids that can be recycled for other purposes.

The filtration process occurs in an enclosed chamber consisting of many plates — each containing an adjustable gasket seal — which traps the contaminants on a membrane surface. This process immensely decreases the cost of material handling, as well as increases operational efficiency exhibited by each facility.

Filter presses allow both large and small businesses in the Aggregates, asphalt and cement production industry to expedite their production processes while paying close attention to their high standards of quality end-product results.

Steel Mill Industry

The usage of a filter press in steel mills is an important step that is essential for the production and efficiency in the industry. The process involves incoming water with impurities getting filtered through a series of mechanical plates to strain out any large particles, then followed by a chemical treatment to separate more fine particles.

This way, impurities like dirt and sand are removed from the water before it enters into other processing systems involved in steel mill operations. Consequently, this allows for better contact between treating chemicals, higher steam generation efficiency, improved heat transfer and reduced corrosion, giving a major overall boost to the quality and productivity of the mill’s work.

Municipal Plants Industry

Filter presses are used in municipal plants in order to treat wastewater and other effluents. This filtering system works by using a series of filter plates, fitted with a cloth mesh, that extract contaminants from the water being processed. The press gradually builds up chambers of pressure pushing against the filter plate and extracting water contaminated with particles and other waste.

Wastewater treatment

The press’ automated operation ensures consistent levels of filtering performance, giving municipalities an effective tool for ensuring their water is safe to be released into public waterways. As part of their mission to protect the environment, municipal plants can rely on the trusty filter press as an essential part of their operations.


Filter presses are essential pieces of equipment for industrial processes such as wood working, food and beverage processing, chemical manufacturing, and aggregates production due their ability to quickly separate liquids from solids with minimal effort or cost involved. By understanding how they work and what they do best you can save time and money by utilizing this technology for your business needs! So next time you’re wondering “what is a filter press” remember these basics!