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The significant importance of industrial filter cloth in the resource utilization of phosphogypsum.
Release time:
2026-06-18
The harmless treatment of phosphogypsum is being accelerated, with the filtration stage emerging as a critical process step.
With the rapid development of the phosphate chemical industry, phosphogypsum— the primary byproduct generated during wet-process phosphoric acid production—has become a focal point for both resource recovery and environmentally sound treatment. In recent years, driven by increasingly stringent environmental regulations and growing demand for comprehensive resource utilization, an increasing number of phosphate chemical enterprises have launched projects to comprehensively utilize phosphogypsum, advancing its high-value applications in areas such as construction materials, road‑building materials, mine backfilling, and cement retarders.
However, phosphogypsum typically contains free acids, soluble phosphorus, soluble fluorine, and certain impurity ions. If not properly treated, these constituents can not only compromise the quality of downstream products but also exacerbate environmental remediation challenges. Consequently, in the process of rendering phosphogypsum harmless, solid–liquid separation and washing–dewatering are critical steps that determine the overall treatment efficiency.
The proper matching of filtration equipment with industrial filter cloths is crucial for enhancing washing efficiency, minimizing residual impurities, and improving production throughput.
Why is filtration necessary in the harmless treatment process for phosphogypsum?
Harmless treatment of phosphogypsum typically involves processes such as slurry preparation, multi-stage washing, and filtration–dewatering, with the primary objectives being:
- Remove free phosphoric acid;
- Reduce the soluble phosphorus content;
- Remove soluble fluorine and other impurities;
- Increase gypsum purity;
- Reduce the risks associated with subsequent resource recovery.
During the washing process, the wash liquor must be continuously separated from the phosphogypsum solids before proceeding to the next washing cycle. Consequently, high‑efficiency, stable filtration equipment is an essential component of the entire production line.
Application of Common Filtration Equipment in Phosphogypsum Treatment
Depending on the treatment scale and process requirements, the following filtration equipment is commonly used in the harmless treatment of phosphogypsum:
Vacuum Belt Filter
It is suitable for continuous production, capable of simultaneously performing filtration, washing, and dewatering, with a large processing capacity, and is widely used in large-scale phosphate chemical enterprises.
Belt Press Filter
Suitable for dewatering certain high‑moisture slurries, it further reduces the moisture content of the filter cake through continuous pressing.
Plate and frame filter press
It offers high filtration accuracy, making it suitable for batch production and certain fine‑processing applications, and can produce filter cakes with low moisture content.
Although different filtration devices operate on distinct principles, they all rely on industrial filter cloths that deliver consistent performance.
The Role of Industrial Filter Cloth in Phosphogypsum Filtration
Industrial filter cloth not only performs solid–liquid separation but also directly affects:
- Filtration rate;
- Washing efficiency;
- Clarity of the filtrate;
- Cake moisture content;
- Filter cloth service life;
- Equipment operational stability.
If the filter cloth has insufficient permeability, the filtration rate will easily decline; if its pore structure is suboptimal, clogging is likely to occur, increasing the frequency of cleaning and disrupting continuous production.
Therefore, industrial filter cloth has become an essential component for the reliable operation of filtration equipment.
Citius industrial filter cloth supports the harmless treatment of phosphogypsum.
As a specialized manufacturer of industrial filtration materials, Citius has developed industrial filter cloths tailored to the continuous filtration conditions of the phosphate chemical industry. These products are compatible with a variety of filtration equipment, including vacuum belt filters, belt press filters, and plate-and-frame filter presses.
Excellent filtration efficiency
The filter cloth’s structural design balances permeability with particle‑retention capacity, enabling the slurry to form a filter cake rapidly and enhancing throughput per unit time.
Good washing performance
In a multi-stage counter-current washing process, the filter cloth maintains stable filtration performance, facilitating thorough penetration of the wash liquor through the filter cake and enhancing impurity removal efficiency.
Not easy to clog
In light of the characteristics of fine particles in phosphogypsum, the filter cloth’s weave structure has been optimized to minimize the retention of fine particles, reduce the risk of clogging, and maintain a stable filtration rate.
Stable continuous operation
The filter cloth exhibits excellent dimensional stability and wear resistance, enabling it to withstand the continuous operating conditions of filtration equipment and minimizing issues such as misalignment and wrinkling caused by deformation.
Reduce overall operating costs
Stable filtration performance helps reduce the frequency of shutdowns for filter changes, increases equipment utilization, and thereby lowers overall operating costs for the enterprise.
How to select the appropriate industrial filter cloth for phosphogypsum treatment?
The properties of phosphogypsum slurry vary among different enterprises; when selecting industrial filter cloth, the following factors should be considered comprehensively:
- Slurry concentration;
- Gypsum particle size;
- Free acid content;
- Number of washes;
- Target filter cake moisture content;
- Filter equipment model;
- Processing capacity requirements;
- Continuous operating time.
Selecting the appropriate filter cloth based on actual operating conditions can further enhance filtration efficiency and extend the service life of the filter cloth.
The significant importance of industrial filter cloth in the resource utilization of phosphogypsum.
As the level of comprehensive utilization of phosphogypsum continues to rise, increasingly stringent requirements are being placed on filtration processes. Stable, high‑efficiency industrial filter cloths not only determine filtration efficiency but also significantly influence subsequent washing quality, dewatering performance, and the quality of resource‑recovery products.
In the future, as green manufacturing and the circular economy continue to develop, high-performance industrial filter fabrics will play an increasingly vital role in the harmless treatment of phosphogypsum, the comprehensive utilization of resources, and green production.
Conclusion
Harmless treatment of phosphogypsum is a crucial step toward green development in the phosphate chemical industry, with filtration serving as an indispensable core process. Selecting industrial filter cloths that are compatible with the filtration equipment helps enhance filtration efficiency, improve washing performance, and reduce operating costs, thereby providing reliable assurance for enterprises to achieve stable, efficient, and continuous production.
For more than three decades, Citius has been a leader in the industrial filtration materials sector, offering tailored industrial filter cloth solutions for equipment such as vacuum belt filters, plate-and-frame filter presses, and belt press filters—serving industries including phosphate chemistry, coal chemistry, new energy, mining, and environmental protection. Looking ahead, Citius will continue to provide robust, reliable product quality and expert filtration‑technology support to advance the harmless treatment of phosphogypsum and its comprehensive resource utilization.
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