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The diaphragm filter press is a highly efficient and versatile equipment used in solid-liquid separation processes. It offers advantages such as high pressing pressure, excellent corrosion resistance, and adaptability to different types of materials. The latest generation of diaphragm filter presses can be categorized into two main types: rubber diaphragms and PP (polypropylene) integral diaphragms. Each type has its own unique applications and benefits.
The rubber diaphragm filter press is ideal for handling weak acids, weak bases, and non-organic solvent materials. It provides sufficient expansion, uses relatively low pressure and gas volume, which helps reduce energy consumption significantly. On the other hand, the PP diaphragm is more suitable for strong acids, alkalis, and organic solvents due to its superior performance and longer service life.
The pressing mechanism can be either gas (air or inert gas) or liquid (water or oil), allowing the system to meet the requirements of various industries. Depending on customer needs, the press components can be configured with food-grade or standard-grade materials, and the control system can be equipped with PLC and HMI (Human-Machine Interface) for easy operation and monitoring.
For general materials, the diaphragm can be pressed within 3–15 minutes, achieving optimal dewatering results. For special materials, a stepwise pressing method—starting with low pressure and then increasing to high pressure—can also be applied. This ensures efficient dehydration and maximizes the filtration effect.
The diaphragm filter press enhances the dewatering efficiency by pressing the filter cake at the end of the feeding process. This not only increases the dryness of the cake but also reduces pollution and labor costs. In some cases, the drying process can even be eliminated. Adding a blowing operation before and after pressing can further reduce the moisture content of the filter cake.
Key features of the diaphragm filter press include:
1. Low-pressure filtration combined with high-pressure pressing, reducing the overall filtration cycle.
2. Using TPE elastomer, it can achieve a maximum pressure of up to 25MPa, significantly lowering water content and saving drying costs.
3. Reduced power consumption during the later stage of filtration when flow rate is low but pressure is high.
4. Quick pressing action that minimizes energy use.
5. Increased density of the filter cake, improving dryness and reducing moisture content.
6. Strong corrosion resistance, suitable for a wide range of solid-liquid separation tasks.
7. Configurable PLC and HMI for advanced control.
8. Excellent sealing performance, anti-fatigue, and anti-aging properties of the diaphragm plates.
The working principle of the Zhangzhou Donglong Diaphragm Filter Press improves the processing capacity and operational flexibility, especially in the cleaning of the filter cake.
The diaphragm filter press operates through several key steps:
1. Positive pressure and strong pressure dewatering, where slurry is forced through the filter medium under high pressure, separating solids from liquids.
2. Extrusion dewatering, where compressed air or water is used to push the diaphragm against the filter cake, enhancing dewatering.
3. Blowing dehydration, where air is blown through the cake to remove additional moisture.
4. Cake discharge, where the filter plates are opened one by one to unload the dried cake.
Depending on the material being processed, the system can be customized to use slurry dewatering, extrusion dewatering, blowing dehydration, or single/double side dehydration, ensuring minimal moisture in the final product.
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