The filter press uses a special filter medium to apply a certain pressure to the object to make the liquid percolate out of the mechanical equipment, so that the solids in the mixed liquid are extracted to realize the separation of solids and liquids. It is a commonly used solid-liquid separation equipment. It was used in chemical production at the beginning of the 18th century, and is still widely used in chemical, pharmaceutical, metallurgical, dye, food, brewing, ceramics and environmental protection industries. Especially for the separation of sticky and fine substances, it has its unique advantages. Do you know the working principle of the filter press? The editor will introduce to you the working principle of the filter press below.

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.

Working principle of filter press:

The first is positive pressure dehydration, also called slurry dehydration, that is, a certain number of filter plates are tightly arranged in a row under the action of strong mechanical force, and a filter chamber is formed between the filter plate surface and the filter plate surface. The filter material is in a strong It is sent into the filter chamber under positive pressure, the solid part of the filter material entering the filter chamber is intercepted by the filter medium (such as filter cloth) to form a filter cake, and the liquid part passes through the filter medium and is discharged out of the filter chamber to achieve the purpose of solid-liquid separation. As the positive pressure increases, the solid-liquid separation becomes more thorough, but in terms of energy and cost, the excessively high positive pressure is not cost-effective. After the pulp is dewatered, a filter press equipped with a rubber extruded membrane, the compressed medium (such as air, water) enters the back of the extruded membrane to push the extruded membrane to further dehydrate the extruded filter cake, which is called extrusion dehydration. After pulp dewatering or squeezing dehydration, compressed air enters one side of the filter cake in the filter chamber to penetrate the filter cake, carrying liquid water from the other side of the filter cake through the filter cloth and out of the filter chamber for dehydration, which is called wind-blown dehydration. If there are filter cloths on both sides of the filter chamber, the liquid part can evenly penetrate the filter cloths on both sides of the filter chamber and drain out of the filter chamber, which is dehydrated on both sides of the filter chamber. After the dehydration is completed, the mechanical pressing force of the filter plate is released, the filter plate is gradually pulled apart by a single piece, and the filter chamber is opened to unload the cake as a main work cycle to complete. According to the different nature of the filtered material, the filter press can be set separately for pulp dewatering, extrusion dewatering, wind blowing dewatering or single or double-sided dewatering, the purpose is to minimize the moisture content of the filter cake.

Filter press filter 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, which is discharged by a pipe connected with the liquid outlet hole under the thrust plate.

Filter press washing method:

When the filter cake needs to be washed, sometimes it flows one-way washing and two-way washing, undercurrent one-way washing and two-way washing.

The above is an introduction to the working principle of the filter press. I believe that through the above introduction, everyone must have a deeper understanding of the filter press. Kintep is a supplier of filter presses. We have a professional production team and a complete product management system to ensure product quality. If you want to know more about the filter press, come and pay attention to our website.