The performance limits of equipment are determined by its core parameters. The design of the 350 plate and frame filter press is centered around the core requirement of "high throughput", and the adaptability of its key parameters to industrial scenarios directly affects its application effect.
- Filtration Area: 350 m²
- Filter Plate Specification: Common sizes 1500×1500mm / 1600×1600mm
- Operating Pressure: 0.6-1.2MPa (High-pressure version customizable)
- Filter Cake Thickness: 30-50mm
- Operation Mode: Fully automatic / Semi-automatic
The 350 plate and frame filter press operates on the principle of "pressure filtration". It uses mechanical pressure to force the liquid component of the solid-liquid mixture to pass through the filter cloth, while solid particles are retained to form filter cakes. The entire process consists of three key stages, which collectively ensure separation efficiency and stability under high-throughput conditions:
The hydraulic system is activated to drive the pressure plate, pressing the filter plates (typically 40-50 pieces) corresponding to the 350 m² filtration area into tight contact, thereby forming multiple independent "filtration chambers". At this stage, the pressure on the sealing surfaces between the filter plates must reach 1.2-1.5 times the operating pressure to prevent material leakage caused by excessive pressure during feeding. This step is critical for high-throughput equipment: poor sealing not only leads to material waste but also reduces overall efficiency due to shutdowns for maintenance.
The solid-liquid mixture is injected into the filtration chambers at high pressure via a feed pump (usually a screw pump or diaphragm pump with a flow rate ≥ 100 m³/h). Driven by the pressure difference, the liquid passes through the filter cloth and enters the drainage channels of the filter plates, eventually converging and being discharged; meanwhile, solid particles gradually accumulate on the surface of the filter cloth to form filter cakes. The feeding stage of the 350 plate and frame filter press features two innovative design elements:
Staged Feeding: In the initial stage, feeding is carried out at low pressure and high flow rate to quickly fill the filtration chambers; in the later stage, pressing is performed at high pressure and low flow rate to reduce the moisture content of the filter cakes and avoid filter cloth clogging caused by high pressure in the initial stage.
Filter Cloth Washing Design: Some equipment is equipped with an automatic filter cloth washing system, which cleans residual impurities on the filter cloth during feeding intervals to extend its service life. (Conventional filter cloths can be used for 3-6 months, and their service life can be extended by 20%-30% after washing.)
When the filter cake thickness reaches the set value (usually controlled by pressure sensors or timers), the system first relieves pressure. Then, the plate pulling mechanism (chain-driven or hydraulic-driven) pulls apart the filter plates one by one. The filter cakes fall off under the action of gravity, completing the discharging process. The plate pulling speed of the 350 plate and frame filter press is typically designed to be 1-2 pieces per second. Combined with an automatic material-receiving conveyor, it enables seamless connection between discharging and the compression stage of the next cycle. The processing time for a single cycle can be controlled within 30-60 minutes, meeting the requirements of continuous operation.
Compared with small and medium-sized filter presses or other separation equipment (such as centrifuges and vacuum filters), the 350 plate and frame filter press demonstrates three irreplaceable advantages in high-throughput scenarios:
High Throughput: With a filtration area of 350 m², the equipment can process 20-30 tons of solid-liquid mixture per cycle (depending on material concentration), and its daily throughput easily exceeds 500 tons—far surpassing the upper limit of 200-300 tons of filter presses with a 100 m² filtration area.
High Separation Precision: The filter cloth pore size can be customized according to the material particle size (commonly 1-5 μm), enabling the retention of fine solid particles (such as catalyst particles in the chemical industry and microbial flocs in municipal sludge). The filtrate clarity can reach over 95%, and in some scenarios, the filtrate can be reused (e.g., reuse of mine tailings water in production lines).
Strong Stability: Large-sized filter plates reduce the number of filter plates, lowering the probability of failures such as inter-plate leakage and filter plate cracking (failures of small and medium-sized filter presses are mostly concentrated on the filter plate sealing surfaces). The failure rate during continuous operation can be controlled below 5%.
Low Maintenance Costs: On one hand, the fully automatic design reduces labor costs (only one person is required to monitor one piece of equipment, no manual operation needed); on the other hand, wearing parts such as filter cloths and hydraulic oil have long replacement cycles, and the equipment's energy consumption is lower than that of centrifuges (under the same throughput, energy consumption is approximately 60%-70% of that of centrifuges).
The 350 plate and frame filter press can adapt to the needs of different industries through three major customized designs:
Material Customization: Filter plates can be made of reinforced polypropylene (acid and alkali resistant, suitable for chemical scenarios), cast iron (high temperature resistant, suitable for metallurgical scenarios), or stainless steel (food-grade, suitable for pharmaceutical/food scenarios).
Pressure Customization: For high-viscosity materials (such as coal slime and printing and dyeing sludge), it can be upgraded to a high-pressure version with 1.6-2.0 MPa to further reduce the moisture content of filter cakes.
Control System Customization: It can be connected to the enterprise's MES (Manufacturing Execution System), enabling real-time monitoring and remote control of data such as throughput, filter cake moisture content, and energy consumption, thus adapting to the needs of intelligent factories.
With its high throughput and strong adaptability, the 350 plate and frame filter press has become a core separation equipment in multiple industrial fields. Below are application cases in three typical scenarios:
Mine Tailings Treatment: Achieving "Zero Discharge" and Resource Recovery
Chemical Wastewater Treatment: Ensuring Continuous Production and Compliance with Environmental Standards
Municipal Sludge Dewatering: Solving the Problem of "High Moisture Content"
Although the 350 plate and frame filter press is suitable for high-throughput scenarios, improper selection can lead to efficiency waste or equipment overload. Below are key recommendations for selection and usage:
- Core of Selection: Match "material properties" and "processing requirements"
- Usage and Maintenance: Three keys to extending service life
Based on its ultra-large filtration area of 350 square meters, the 350 plate and frame filter press, with its optimized structural design, flexible customization solutions and stable operating performance, has become the "core equipment" for high-throughput solid-liquid separation scenarios. Whether it is resource recovery from mine tailings, up-to-standard treatment of chemical wastewater, or reduction disposal of municipal sludge, it can strike a balance between "efficient separation" and "cost control", providing strong support for the green production and sustainable development of industrial enterprises. In the future, with the further integration of intelligent technologies, the 350 plate and frame filter press will also achieve breakthroughs in aspects such as "unmanned operation" and "data-based regulation", further enhancing its competitiveness in the field of solid-liquid separation.
