1. Overview of core elements

1. Material mechanism: Polypropylene fiber has a hydrophobic structure and can remain stable in a pH 2-12 environment to avoid chemical corrosion.

2. Pore size and retention: The filtration level covers 5–20 μm, which can accurately intercept fine solid particles.

3. Structural strength: tear strength ≥ 250 N, supporting secondary pressing pressure of 0.6-1.0 MPa, ensuring long-term circulation without damage.

2. Typical applications and measured data

Printing and dyeing wastewater:

Case: A printing and dyeing factory in Jiangsu used 800×800 mm polypropylene filter cloth. After 1200 hours of continuous operation, the moisture content of the filter cake dropped from 75% to 43%, with no obvious pulling or clogging.

Chemical pickling liquid:

Comparative test: After 500 cycles of polypropylene filter cloth, the liquid flux still remains at 85%, while that of polyester filter cloth only remains at 60%.

Mine tailings dewatering:

Effect: 5 μm filter cloth can intercept >98% of tailings powder, and the solid content of the filter cake is stable at more than 30%.

The above cases not only verify the reliability of polypropylene materials under high-corrosion and high-load conditions, but also highlight its cost advantage with a cleaning and maintenance cycle of up to 800-1200 hours.

3. Selection Process and Maintenance Guide

1. Working condition analysis: Preliminarily determine the filter cloth material through particle size distribution and chemical composition testing.

2. Pressure and temperature matching: Select the corresponding thickness and model based on the equipment’s pressing pressure and operating temperature.

3. Life assessment: Develop a filter cloth replacement and backwashing plan based on the frequency of on-site operation and maintenance.

4. Regular maintenance: Use a combination of backwashing and chemical cleaning to prevent fiber clogging and performance degradation.