The plate and frame filter makes the stainless steel multi-layer plate and frame filter press suitable for purifying at a concentration lower than 50%, and the liquid containing less slag is sealed for purification, semi-fine filtration, sterilization, clarification, etc. Fine filtration and direct use of microporous membrane can directly achieve the purpose of sterile filtration without passing through the microporous membrane filter. The floating liquid is pumped into each closed filter chamber of the filter. Under the working pressure, the filtrate passes through the filter membrane or other filter material, and is discharged through the liquid outlet. The filter residue is left in the frame to form a filter cake, and then reaches Solid-liquid separation purposes.
Plate and frame filter operation steps:
The first step of pressing: Before the filter press operation, the whole machine must be inspected: check whether the filter cloth is folded or overlapped, and the power supply has been connected normally. After the inspection, the pressing operation can be performed. First press the “Start†button, the oil pump starts working, and then press the “pressing†button again, the piston pushes the pressing plate to press, when the pressing force reaches the set high pressure The hydraulic system automatically stops.
The second step material: when the plate frame filter is pressed, the feeding operation can be performed: the feed pump is turned on, and the feed valve is slowly opened, and the feed pressure is gradually increased to the normal pressure. At this time, observe the liquid output of the filter press and the leakage between the filter plates. After filtering for a period of time, the liquid output from the filter press is gradually reduced. At this time, the filter residue in the filter chamber is gradually filling, when the liquid outlet is not out. When the liquid or only a small amount of liquid, it is proved that the filter residue in the filter chamber is completely filled to form a filter cake. If the filter cake needs to be washed or air-dried, it can be carried out subsequently, and the unloading operation can be carried out without washing or air drying.
The third step of washing or air drying: After the plate filter filter cake is full, the feed pump and the feed valve are closed. Open the washing pump or air compressor, slowly open the washing liquid or air inlet valve, and wash or air dry the filter cake. After the operation is completed, the washing machine or the air compressor and its valves are closed, and the unloading operation can be performed. The fourth step of unloading the cake: first close the feed pump and feed valve, into the washing liquid or air inlet device and valve, and then press the "release" button on the operation panel, the piston rod drives the pressure plate to retreat, retreat to the appropriate After the position, release the “release†button, and manually pull the filter plate to remove the filter cake, and at the same time clean the filter residue stuck on the sealing surface to prevent the filter residue from being caught on the sealing surface to affect the sealing performance and cause leakage. . At this point, an operation cycle is completed.
The plate and frame filter consists of a series of filter chambers consisting of alternately arranged filter plates and filter frames. The surface of the filter plate has a groove, and a protruding portion thereof supports the filter cloth. There are through holes in the corners of the filter frame and the filter plate, which form a complete passage after assembly, and can pass into the suspension, wash water and lead the filtrate. There are handles on both sides of the plate and frame supported on the beam, and the plate and frame are pressed by the pressing device. The filter cloth between the plates and the frames functions as a gasket. The suspension hydraulic pressure is introduced into the filter chamber by the feed pump, and the filter residue is formed on the filter cloth until it fills the filter chamber. The filtrate passes through the filter cloth and flows along the groove of the filter plate to the corner channel of the plate frame to be discharged. After the filtration is completed, the filter residue can be washed by washing water. After washing, compressed air is sometimes introduced to remove the remaining washing liquid. Then open the filter press to remove the filter residue, clean the filter cloth, re-press the plate, frame, and start the next work cycle.