The high-pressure membrane filter press is an industrial equipment widely used in the field of solid-liquid separation, achieving efficient material dewatering through the application of high pressure. Its core characteristic lies in the use of an elastic diaphragm filter plate structure, which allows for a secondary squeezing of the filter cake during the later stages of filtration using a compression medium (such as compressed air or water), further reducing the filter cake’s moisture content.
Equipment Structure and Operating Principle
The equipment mainly consists of a frame, filter plates, membrane plates, a hydraulic system, and an automatic control unit. The operation process is divided into two stages:
Preliminary Filtration Stage: The material is pumped into the filter chambers, where solid particles are trapped by the filter cloth to form the filter cake, and the liquid passes through the filter cloth and is discharged.
Pressurization and Dewatering Stage (Squeezing): A high-pressure medium (pressure typically reaching 2.0–3.0 MPa) is injected into the membrane plates. The diaphragms deform and mechanically squeeze the filter cake, significantly enhancing the dewatering efficiency.
Key Technical Parameters
| Parameter | Value Range | Notes |
| Filtration Pressure | 0.6 – 1.2 MPa | (Feed Stage) |
| Squeezing Pressure | 1.6 – 3.0 MPa | (Diaphragm Squeezing Stage) |
| Filter Plate Size | Common dimensions 800 – 2000 mm | |
| Filter Chamber Thickness | 30 – 60 mm | (Adjustable) |
| Filter Plate Material | Reinforced Polypropylene, Rubber Composite Materials | |
| Operation Mode | Fully Automatic / Semi-Automatic Control | |
| Installed Power | Typically 5 – 30 kW | Depends on equipment size |
Applicable Materials
This equipment is suitable for solid-liquid separation processes in various industries:
- Mining Industry: Metal concentrate dewatering, tailings treatment.
- Chemical Industry: Pigments, dye intermediates, calcium carbonate, and other slurries.
- Environmental Protection: Municipal sludge, chemical sludge from industrial wastewater treatment.
- Metallurgy Industry: Aluminum oxide red mud, aluminum hydroxide, etc.
- Ceramics Industry: Refinement of raw materials such as china clay and glaze.
Filtration Performance Indicators
Materials processed by this equipment can typically achieve:
- Filter Cake Moisture Content: Can be reduced to 15% – 30% (depending on the material characteristics).
- Solid Recovery Rate: Generally greater than 95%.
- Filtrate Turbidity: < 100 NTU (depending on the material characteristics).
- Processing Capacity: Single-cycle throughput can reach 2 – 50 $m^3$ (depending on equipment size).
Technical Features
- Energy Saving Advantage: Energy consumption is reduced by approximately 30% compared to traditional filter presses when achieving the same dewatering effect.
- Wide Adaptability: Pressure parameters can be adjusted to suit materials with different filtration difficulties.
- High Degree of Automation: Integrated PLC control system can realize fully automatic filtration, cake discharge, and washing processes.
The high-pressure membrane filter press plays a significant role in improving production processes and enhancing dewatering efficiency. In practical applications, equipment parameters and operating procedures must be reasonably selected based on material characteristics to achieve the best separation effect. Equipment maintenance should focus on critical elements such as filter cloth selection, membrane sealing, and hydraulic system stability.
