Performance comparison between diaphragm filter press and ordinary filter press

Here is a performance comparison between diaphragm filter presses and ordinary filter presses:

Filtration Efficiency

Diaphragm Filter Press: It has a higher filtration efficiency. The diaphragm structure allows for further compression and dehydration of the filter cake after the initial filtration, which can effectively reduce the moisture content of the filter cake. This is especially beneficial in applications where a low - moisture - content filter cake is required, such as in the mining and chemical industries.

Ordinary Filter Press: Relies solely on the pressure difference between the two sides of the filter cloth for filtration. Although it can achieve solid - liquid separation, the filtration efficiency is relatively low, and the moisture content of the filter cake is usually higher than that of the diaphragm filter press.

Filtration Quality

Diaphragm Filter Press: Can provide better filtration quality. The uniform pressure exerted by the diaphragm on the filter cake helps to form a more compact and even filter cake structure, which is conducive to improving the clarity of the filtrate. In addition, the diaphragm can also prevent the penetration of fine particles, thereby reducing the content of impurities in the filtrate.

Ordinary Filter Press: May have some limitations in filtration quality. Due to the uneven force on the filter cake and the lack of a secondary compression mechanism, there may be some fine particles that are not effectively intercepted, resulting in a relatively lower clarity of the filtrate.

Operational Pressure

Diaphragm Filter Press: Can withstand higher operational pressures. The special design of the diaphragm and the frame structure enables it to bear greater pressure, which is beneficial for improving the filtration effect and reducing the filtration time. Generally, the operating pressure of the diaphragm filter press can reach 1.0 - 2.5 MPa or even higher.

Ordinary Filter Press: Usually operates at a relatively lower pressure. The maximum operating pressure is generally around 0.6 - 1.0 MPa. Exceeding this pressure range may cause damage to the filter plate and other components.

Equipment Structure and Complexity

Diaphragm Filter Press: Has a more complex structure. In addition to the basic filter plate and frame structure, it is also equipped with a diaphragm and a hydraulic system for diaphragm compression. This makes the equipment more complex in manufacturing and maintenance, and the cost is also relatively high.

Ordinary Filter Press: Has a relatively simple structure. It mainly consists of filter plates, frames, and a feeding system. The simple structure makes it easier to operate and maintain, and the equipment cost is relatively low.

Applicability

Diaphragm Filter Press: Is suitable for a wide range of applications, especially in industries where high - quality filtration and low - moisture - content filter cakes are required, such as the pharmaceutical, food, and fine chemical industries. It can also handle some difficult - to - filter materials due to its high - pressure filtration and secondary compression functions.

Ordinary Filter Press: Is suitable for some applications where the requirements for filtration quality and filter cake moisture content are not particularly high, such as the general industrial wastewater treatment and some coarse - grained material filtration.

In summary, diaphragm filter presses have advantages in filtration efficiency, filtration quality, and operational pressure, but they also have a more complex structure and higher cost. Ordinary filter presses, on the other hand, are simpler and more cost - effective, but have some limitations in performance. The choice between the two depends on the specific requirements of the application and the characteristics of the material to be filtered.