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1. Bright flow can be washed: In addition to the feed channel, this form also has a washing liquid channel. The filtered part is the same as that of the bright flow. After the filtration is completed, the washing operation is performed.
2. Unwashable flow: There is only one intermediate feed channel in this form. The material enters each filter chamber through the feed holes on the thrust plate through the feed channel. The filtrate is discharged through the filter medium through the liquid outlet holes of each filter plate. It is suitable for general filtration and has the advantages of fast filtration speed and intuitive filtration effect.
3. Undercurrent washable: divided into undercurrent one-way washing and undercurrent two-way cross-wash. This type of filter press feed and washing liquid are the same as that of the open flow, but the liquid is discharged differently. The liquid from each filter plate is collected and discharged together through the liquid discharge channel. This form is suitable for contaminated, toxic, volatile and needing washing materials.
4. Undercurrent cannot be washed: In addition to the feed channel, this type of filter press also has a liquid outlet channel. The filtrate of each filter plate is discharged together through this channel. This form is suitable for contaminated, toxic, volatile, and does not require washing.
When buying a filter plate, you need to understand the classification of filter plate materials of the filter press. At present, the filter plates are mainly divided into PP material filter plates, PVDF material filter plates, aluminum filter plates, natural rubber filter plates, stainless steel filter plates, etc., and cast iron filter plates:
1. PP material filter plate:
PP is currently the most commonly used, that is, polymer polypropylene. This material has good tolerance to various acid and alkaline acids, including the strongest hydrofluoric acid, and has good tolerance. However, the operating temperature range is relatively small. *May only tolerate short-term materials of 70.
2. PVDF material filter plate:
PVDF is an organic material with the best acid resistance and temperature resistance. Its normal temperature resistance can reach about 150, but its alkali resistance is extremely poor.
3. Aluminum filter plate:
In all metal filter plates, the lightest, but relatively poor acid tolerance.
4. Natural rubber filter plate:
The filter plate with natural rubber is still good, especially the diaphragm, which has good elasticity but poor strength.
5. Stainless steel filter plate: It has good acid and alkali resistance, but the price is the largest among all filter plates. After all, the material itself is expensive and the machining is very time-consuming.
6. Cast iron filter plate: heavy weight, poor acid resistance, and extremely high temperature resistance. The sealing surface is actually made of organic materials, so there are certain limitations.
The filter plate is a key component for the filter press to separate solid-liquid. Different filter plate materials, filter plate liquid output methods, and filter plate washing methods are important factors that affect the filter efficiency, filtration effect, energy consumption, labor cost, and service life of the filter plate. Choose a suitable filter plate and your filter press will definitely be better in your future work. So how to choose and purchase a filter plate for filter presses, the editor briefly introduces it to you: According to the filter plate's liquid discharge method and washing method, the filter plate of the filter press can be divided into four types: open flow can be washed, open flow cannot be washed, undercurrent can be washed, and undercurrent cannot be washed: