the core control parameters and application optimization of the filter pressing process

By precisely controlling the core parameters such as filter pressing pressure, filter cake thickness, and filter cloth tension, the chamber diaphragm filter press can significantly improve the dehydration efficiency in multiple application scenarios such as printing and dyeing wastewater, mineral processing tailings, and pharmaceutical concentration, and the filter cake moisture content can be reduced by as low as 35%. Next, a detailed analysis will be conducted in conjunction with the 2024 pilot project case of the printing and dyeing plant.

Case analysis: In the 2024 pilot project of the printing and dyeing plant, the system filter pressing pressure was increased from 1.2MPa to 1.6MPa, the filter cake moisture content was reduced from 43% to 38%, and the annual drying energy consumption was reduced by about 18%, verifying the effect of pressure and filter cake thickness optimization.

  1. Filter pressing pressure: As the core driving factor of the filter pressing process, the appropriate range of filter pressing pressure is 1.0~1.8MPa, and the specific value should be dynamically adjusted according to the material viscosity and solid content. Within this range, the dehydration speed and the integrity of the filter cake can be guaranteed.
  2. Filter cake thickness: The filter cake thickness directly affects the secondary extrusion effect, and the optimal thickness is 8~12mm. Too thick will increase the air permeability resistance; too thin will waste the extrusion potential. According to the measured data, when the filter cake thickness is 10mm, the moisture content of the filter cake can be reduced to 35%.
  3. Filter cloth tension: The filter cloth tension affects the sealing between the filter cloth and the filter plate. It is recommended to control the tension between 450~550 Newtons to ensure that the filter channel is evenly stressed and effectively reduce side leakage.
  4. Process optimization suggestions:
  • Introduce PLC+SCADA control system to monitor and realize parameter closed-loop control in real time;
  • Regularly check the wear and deformation of the filter cloth. It is recommended to replace the filter cloth every 200 working cycles;
  • The secondary extrusion stage adopts a pressure classification control strategy, with a primary extrusion pressure of 1.0MPa and a secondary extrusion pressure of 0.5MPa to reduce energy consumption.
  1. Summary and selection suggestions: When selecting a chamber diaphragm filter press, comprehensively consider the solid content, processing volume and automation requirements of the material, and give priority to equipment with high-precision pressure control and online monitoring functions to obtain higher economic and environmental benefits.