There are many users of the plate and frame filter press, mainly because the use effect of the plate and frame filter press is good, the solid content of the filter cake is high, and the filtered sewage can meet the standard of reuse, which is very environmentally friendly. However, there are also users who report that the filtering effect decreases after using for a period of time, which may be a problem with the filter cloth.
HOW TO CHOOSE THE WOVEN FLITER OF THE PLATE
The filter cloth is a very important factor affecting the filter press effect in the plate and frame filter press. Whether the filtrate can successfully pass through the filter cloth and only leave solid matter depends largely on the material of the filter cloth, but there are many types of filter cloth. How to choose filter cloth?
There are many types of filter cloth, first of all, it can be divided into natural and synthetic from the fiber material. Natural filter cloth materials include cotton, linen, silk, etc., and synthetic filter cloth materials include polyester, acrylic, and Velen.
However, in terms of stability, safety, and adaptability, natural fibers are inferior to synthetic fibers, so most of them choose synthetic fiber filter cloths in actual use, and you can choose according to the different characteristics of filter cloths.
1. Polyester filter cloth
Polyester filter cloth has good wear resistance and corrosion resistance, good recovery, poor conductivity, and can withstand high temperatures of 130-150 degrees. Polyester filter cloth is divided into long fiber and short fiber. Long fiber has smooth surface, high strength, wear resistance, easy cleaning, good air permeability, and is more popular.
2. Acrylic filter cloth
Acrylic filter cloth has been tested by experiments, and its abrasion resistance is 10 times that of natural cotton fiber. Compared with the abrasion resistance of other fibers, it is also unmatched. However, it is not photostable, cannot be exposed to the sun, is toxic, and cannot be used in the pharmaceutical or food industries.
3. Velen filter cloth
Velen, also known as polyvinyl alcohol, has lower strength than polyester, poor elasticity, and average wear resistance, but it has an advantage that other materials cannot match, that is, strong alkali resistance and good hygroscopicity. However, it is not acid-resistant and temperature-resistant is relatively low.
HOW OFTEN SHOULD THE WOVEN FILTER CLOTH BE CHANGED
The service life of the filter cloth is generally 3-6 months. Due to the different daily workload of different manufacturers, the service life of the filter cloth is also different.
Most manufacturers do not have a fixed cycle to say how often to change, but judge whether the filter cloth needs to be replaced based on experience. As long as the filter cloth is not damaged, it is acceptable to extend the filter time. If the mud pressing work is really tight and the mud pressing efficiency cannot meet the production requirements, it will be replaced.
But the correct and scientific replacement time should be judged by the pressure change of the plate frame. For example, after the mud enters, the pressure rises faster, and the total feed volume gradually decreases than before. The filter cloth should be cleaned first to eliminate the possibility of clogging the water tank and the water hole. If the effect is not improved, replace the filter cloth. cloth.
The filter cloth of the plate and frame filter press itself is a consumable, and it is normal to replace it. What we can do is to select the appropriate filter cloth material according to the nature of the material in the early stage, strictly abide by the usage specifications when using it, measure the replacement cycle according to our affordability, and strike a balance between capital and use effect