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The role of the chamber filter press in the entire filtration process
- 2020-06-23-

The role of the chamber filter press in the entire filtration process

The working principle of the box filter press is that the filter plate is arranged to form a filter chamber (the two sides of the filter plate are recessed, and every two filter plates are combined into a box-shaped filter chamber).

The principle diagram is as follows: the surface of the filter plate has pits and bosses to support the filter cloth. There are through holes in the center and corners of the filter plate, which form a complete channel after assembly, which can pass into the suspension, washing water and The filtrate is drawn out. The two sides of the filter plate have handles supported on the beam, and the filter plate is pressed by the pressing device. The filter cloth between the filter plates plays a sealing role.

Under the pressure of the feeding pump, the material liquid that needs to be filtered is sent to each filter chamber, and the solid and liquid are separated through the filter medium (select the appropriate filter cloth according to different industries). The filter residue is formed on the filter cloth until it is full. The filter chamber forms a filter cake. The filtrate passes through the filter cloth and flows along the groove of the filter plate to the liquid outlet channel below, and is discharged in a centralized manner. After filtering, the filter residue can be washed with clean washing water. After washing, compressed air is sometimes introduced to remove the The remaining washing liquid. After filtration, open the filter press to remove the filter cake (the filter cake is stored between two adjacent filter plates), clean the filter cloth, and re-press the plate filter to start the next working cycle.

The working principle of the box filter press The plate and frame filter chamber is composed of a flat filter plate and a hollow filter frame. The filter cloth is fixed on the plate frame. This is the main form of the early filter press. The box filter press The main advantage is that it is convenient to replace the filter cloth, but the disadvantage is that the efficiency is low, the filtering effect is not good, and the filter plate is easily damaged; The main advantages of the box filter press on the block filter plate are that it has higher efficiency and better effect, and the filter plate is relatively durable (under the same conditions). The filter cloth also has an automatic device, and the number of filter cloth replacements is generally not frequent.

filter section

The filter part is composed of filter plates arranged on the main beam in a certain order, filter cloth sandwiched between the filter plates, and diaphragm filter plates. The filter plates, filter cloth and diaphragm filter plates are arranged alternately to form several independent filters. Filtration unit - When the filtration of the filter chamber starts, the slurry is driven by the feed pump and enters each filter chamber through the feed port on the thrust plate, and is filtered by the pressure generated by the feed pump. Due to the effect of the filter cloth , so that the solid remains in the filter chamber to form a filter cake, and the filtrate is discharged from the faucet (open flow) or the liquid outlet valve (undercurrent) (see Table 1 for the specifications of the faucet). The filter cake is washed with washing water; if a filter cake with a lower moisture content is required, compressed air can also be introduced from the washing port to pass through the filter cake layer to take away part of the moisture in the filter cake (applicable to Uk Model). If compressed air or high-pressure liquid is introduced from the air inlet, the diaphragm is agitated, and the filter cake is pressed, which can further reduce the moisture content of the filter cake

In the process of using the filter press, the filter cloth plays a key role. The quality of its performance and the correct selection of the filter directly affect the filtering effect. Among the filter cloths currently used, the most common ones are woven from synthetic fibers. According to the different materials, it can be divided into polyester, vinylon, polypropylene, nylon and so on.