What is a filter press?
The filter press uses a special filter medium to apply a certain pressure to the object to make the liquid dialysis out of a mechanical device. It is a commonly used solid-liquid separation device. Basically, each filter press is designed based on the volume and type of slurry that needs to be dewatered.
Jingjin fiterpress is a trusted expert in liquid/solid separation and offers a wide range of filter press types and capacities to suit specific application needs for trouble-free, economical dewatering. These include configurations such as sidebar automatic, manual overhead, automatic dual overhead beam, stainless steel clad, explosion-proof filter presses, vacuum filter presses, and hand filter presses.
How does a Filter Press Work?
The hydraulic pressure mechanism of the filter press is composed of a hydraulic station, an oil cylinder, a piston, a piston rod, and a Hafland card hydraulic station connected to the piston rod and the pressure plate. The structure consists of a motor, an oil pump, and an overflow valve (pressure adjustment). Directional valve, pressure gauge, oil circuit, oil tank.
Filtration method: the way the filtrate flows out is divided into open flow filtration and undercurrent filtration. For open flow filtration, a water nozzle is installed on the outlet hole under each filter plate, and the filtrate flows out from the water nozzle intuitively. Underflow filtration, a liquid outlet channel hole is arranged under each filter plate, and the liquid outlet holes of several filter plates are connected to form a liquid outlet channel, and the liquid outlet is discharged from the pipe connected with the liquid outlet hole under the thrust plate.
Washing method: When the filter cake needs to be washed, there are sometimes one-way washing and two-way washing, undercurrent one-way washing and two-way washing.
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Industry, application and operational considerations will guide specific details such as overall design, filtration capacity, number of chambers, filter plate size, materials of construction, and other features/systems such as automatic plate shifters, cloth cleaning systems, drip pans, cake guards and safety light curtains. The design of the filter press depends on many factors such as the filtration cycle time, desired cake dryness, filter cloth life, the need for manual or automatic plate movers, and many other factors.
The structure of the filter press consists of three parts:
- Thrust plate
- Pressure plate
2. Hold-down mechanism
- Manual compression
- mechanical compression
- hydraulic compression
3. Filter mechanism
The filter mechanism is composed of a filter plate, a filter frame, a filter cloth, and a squeeze diaphragm. The two sides of the filter plate are covered by filter cloth. When a squeeze diaphragm is required, a set of filter plates is composed of a diaphragm plate and a side plate. Both sides of the base plate of the diaphragm plate are covered with rubber diaphragms, and the outside of the diaphragm is covered with filter cloth. The side plates are ordinary filter plates. The material enters the filter chambers from the material holes on the thrust plate. The solid particles are trapped in the filter chambers because their particle size is larger than the pore size of the filter medium (filter cloth), and the filtrate flows out from the outlet holes under the filter plate. When the filter cake needs to be squeezed dry, in addition to squeezing with a diaphragm, compressed air or steam can also be used to pass in from the washing port, and the airflow can flush the water in the filter cake to reduce the moisture content of the filter cake.
Basically, the filter press design is based on the dewatering volume and type of slurry. JingJin is an expert in liquid and solid separation and offers a wide range of filter press types and capacities to suit specific application needs for trouble-free, economical dewatering.
Filter presses are versatile pieces of equipment used in a variety of applications to separate solids from liquids. Some common applications of filter presses include:
- Mining and minerals: Filter presses are used to dewater slurry generated during mining and minerals processing. The presses can extract valuable metals and minerals from the slurry, making it easier and more cost-effective to transport and dispose of the remaining material.
- Chemical processing: Filter presses are used to separate solids from liquids in chemical processing applications. They can be used to filter catalysts, remove impurities from chemicals, and clarify liquids.
- Food and beverage: Filter presses are used to filter and clarify liquids such as wine, beer, and fruit juices. They can also be used to remove solids and impurities from cooking oils and other food products.
- Pharmaceuticals: Filter presses are used to filter and purify pharmaceutical products. They can be used to remove impurities and ensure that the final product is free of contaminants.
- Municipal wastewater treatment: Filter presses are used in municipal wastewater treatment plants to dewater sludge generated during the treatment process. This allows the sludge to be transported and disposed of more easily and effectively.
- Industrial wastewater treatment: Filter presses are used in a variety of industrial wastewater treatment applications to separate solids from liquids. They can be used to filter wastewater from manufacturing processes, remove heavy metals and other contaminants from industrial wastewater, and more.
Original article address：What is a Filter Press and How Does it Work