Filter cloth for filter press, belt press filter, zero discharge in chemical industry, gypsum filtration
Filter cloth for filter press, belt press filter, zero discharge in chemical industry, gypsum filtration
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  • Filter cloth for filter press, belt press filter, zero discharge in chemical industry, gypsum filtration
  • Filter cloth for filter press, belt press filter, zero discharge in chemical industry, gypsum filtration

Filter cloth for filter press, belt press filter, zero discharge in chemical industry, gypsum filtration

Gypsum, a typical industrial solid waste characterized by high water content, easy compaction, and high viscosity, requires efficient treatment focusing on dehydration stability and filter cake dryness. In a filter press system, the filter cloth is not only the core medium for solid-liquid separation but also a key variable affecting filtration efficiency, filter cake quality, and equipment maintenance costs.

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Detailed Description

  • Filter cloth for filter press, belt filter press, zero-emission in chemical industry, gypsum filtration
    Filter type: Belt filter press
    Application industry: Zero-emission in chemical industry
    Material description: Gypsum filtration

Gypsum filtration solutions in the era of zero emissions in the chemical industry: From by-product waste to resource utilization

In the global “ Dual Carbon ” Under the background of the continuous strengthening of the "dual carbon" strategy and environmental regulations, the chemical industry is facing unprecedented transformation pressure. “ Zero emission ” is no longer a vague slogan, but a threshold that enterprises must cross. In the process of moving towards green and high-quality development, the treatment of a large number of solid waste by-products represented by gypsum has become an industry bottleneck. How to efficiently filter and stably dewater, and realize the resource utilization of gypsum-based solid waste, has become a key link for chemical enterprises to achieve the goal of zero emissions.

I. Chemical industry “ Zero emission ” Challenges: Not just water, but also solid waste

The so-called “ Zero emission ” does not only limit to wastewater “ zero direct discharge ” but also covers the whole process control and reuse of solid waste residue. In the sub-sectors of phosphate chemical industry, chlor-alkali chemical industry, flue gas desulfurization, titanium dioxide, etc., by-product gypsum (such as phosphogypsum, desulfurization gypsum, titanium gypsum) is an unavoidable “ heavy burden ”。

Taking the phosphate chemical industry as an example, for every production of 1 ton of phosphoric acid, about 4.5 tons of phosphogypsum will be produced. More than 1 100 million tons of phosphogypsum are produced in China every year, but the resource utilization rate is less than 30% . If not handled properly, it will not only occupy land for storage, but also may cause sulfate and fluoride pollution of groundwater, hindering enterprises from achieving “ Zero emission ” standards.

II. The key to the treatment of gypsum by-products: Stable dehydration, safe and controllable

Gypsum, as a typical by-product solid waste with high water content, easy caking, and high viscosity, the core of its efficient treatment lies in dewatering stability and filter cake dryness 。

1.  Dewatering difficulties

  • Loose structure, high water content (initial up to 40%~60% )
  • Easy to absorb moisture and return to wetness, secondary pollution after storage
  • Acidic or saline, strong corrosiveness, high requirements for equipment and materials

2.  Selection of dewatering equipment

  • Currently, the mainstream use is Belt filter press 、 Plate and frame filter press 、 Centrifugal dehydrator etc.
  • Belt filter press because of its continuous operation, low energy consumption, strong adaptability is increasingly favored by large chemical enterprises, especially in the treatment of phosphogypsum, desulfurization gypsum and other continuously produced by-products.

III. Key materials for gypsum filtration: Filter cloth technology determines success or failure

In the filter press system, the filter cloth is not only the core medium for solid-liquid separation, but also a key variable affecting filtration efficiency, filter cake quality and equipment maintenance cost.

1.  Characteristics of filter cloth:

  • Acid and alkali resistance : To cope with corrosive media such as phosphoric acid and sulfuric acid remaining in gypsum
  • High tensile strength : Withstand continuous pressing and tension operation
  • High permeability + Good retention : Improve dewatering speed and reduce fine particle penetration
  • Good peelability : Easy for automatic removal of filter cake, reducing manual intervention

2.  Customized solutions for professional filter cloth:

Represented by Xiamen Citius (Xiamen Citius) etc., professional filter cloth enterprises have launched customized filter cloth solutions for gypsum-based solid waste, such as:

  • Monofilament / Multifilament composite weaving technology, combining breathability and slag interception
  • Surface anti-clogging coating or modification treatment to prolong service life
  • Matching the high tension and strong dewatering environment of belt filter press

Practice shows that after using high-performance industrial filter cloth, the water content of gypsum filter cake can be stably controlled at 15%~25% which is significantly better than traditional fabric solutions, and has good storage and transportation performance.

IV. Resource utilization: From “ waste gypsum ” to “ alternative raw materials ”

After dehydration and stabilization, gypsum is no longer a problem, but a resource. With optimized source separation, end-of-life treatment, and overall solutions, gypsum solid waste can be widely used in the following areas:

1.  Building Materials

  • Replacing natural gypsum in paper-faced gypsum boards, building gypsum powder, etc.
  • Processed into gypsum bricks and gypsum blocks, participating in the green building materials system

2.  Cement Industry

  • Incorporated into cement clinker as a retarder to stabilize the hydration process
  • Replacing some desulfurization gypsum and natural gypsum, contributing to environmental protection and carbon reduction in the cement industry

3.  Soil Remediation and Agricultural Utilization

  • Processed gypsum powder can be used to improve acidic soil and provide calcium and sulfur elements
  • Strict standards are needed to avoid risks such as heavy metals and radioactivity

4.  High Value-Added Chemical Raw Materials

  • Some technical approaches explore converting gypsum into high value-added products such as sulfuric acid, ammonium sulfate, and gypsum whiskers, promoting resource utilization “ Upstream Development ”。

V. Future Trends: From “ Gypsum Treatment ” To “ Designing Zero-Emission Processes ”

Filtration and dehydration are key steps in achieving zero emissions, but a further step is to incorporate gypsum production, treatment, and reuse into the overall production system planning:

  • Process Synergistic Design : Moderate adjustment of front-end processes to improve gypsum filterability and stability
  • Equipment - Filter cloth linkage optimization : Improve the overall efficiency and reliability of the filtration system
  • Full Life Cycle Management : Monitoring and tracing the entire process from byproduct generation to resource utilization
  • Policy + Standard Guidance : Promote mandatory treatment and increased resource utilization rate of gypsum byproducts

Conclusion: Gypsum filtration is not the end, but the beginning of green manufacturing

Achieving zero emissions in the chemical industry is not the victory of a single technology, but a systematic project of process optimization, equipment upgrades, material innovation, and resource reuse. Gypsum filtration, as a crucial part of this system, has transformed from “ Environmental Burden ” Into “ Resource Entry ” . With the iteration of filtration equipment and continuous breakthroughs in filter cloth technology, chemical enterprises are gradually getting rid of “ Treatment and Storage ” The old path, moving towards “ Zero-Waste Factory ” Future blueprint.

📞 For technical support or sample testing services, please contact Xiamen Citius (Xiamen Citius) ：

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