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Dec 18, 2023
The press filter functions by applying pressure between two parallel plates and frames, effectively separating liquid from solid materials. It is recognized for its high processing capacity, low cake moisture content, and straightforward operation. However, the cleanliness and integrity of the filter cloth significantly influence both filtration efficiency and the operational performance of the equipment during use. Consequently, mastering the appropriate method for washing filter cloths is essential to maintain optimal equipment performance and extend the service life of the filter cloth.
Physical Cleaning Method
The physical cleaning method represents the most common and relatively gentle approaches to cleaning filter cloths, primarily involving manual brushing and high-pressure water jet cleaning.
Manual Brushing
Manual brushing is suitable for small press filters or when the filter cloth has minimal solid particle attachment or light contamination. The surface of the filter cloth should first be rinsed with clean water to eliminate most residual material; thereafter, a small amount of neutral detergent can be applied. A soft-bristled brush should be used to gently scrub the cloth, ensuring even pressure to avoid leaving brush marks or damaging the cloth. The advantages of manual brushing are its simplicity and low cost, but its cleaning efficiency is low for large equipment and heavily contaminated filter cloths.
High-Pressure Water Jet Cleaning
High-pressure water jet cleaning is more appropriate for larger filter presses or when dealing with significant attachments of solid particles or heavier contamination on the filter cloth. A high-pressure water jet (ideally operating at 5-10 MPa) should be utilized for this purpose. Excessively high pressure may damage the fabric, whereas insufficient pressure will lead to inadequate cleaning results. During cleaning, the water jet should be continuously moved to avoid focusing on one spot for too long.
Chemical Cleaning Method
Acid-Base Solution Cleaning:
Depending on the chemical composition of the residual material present on the filter press cloth, an appropriate acid-base cleaning agent should be selected. For instance, if the residual material is alkaline in nature, diluted sulfuric acid may be employed for cleaning purposes. Conversely, if the residual material is acidic, a solution of sodium hydroxide or sodium carbonate can be utilized. The filter press cloth should be immersed in the chosen acid-base solution, with soaking duration contingent upon the extent of contamination; this typically ranges from 1 to 2 hours.
Bolian filtration textiles are strictly produced in accordance with process standards, and each production step is carefully inspected. We follow ISO 9001 standards to ensure that each batch of products and each filter cloth meets quality inspection criteria.
