The Key Value of Industrial Filter Cloth in Lead-Zinc Ore Beneficiation and Filtration 

—— Efficient Separation Practices with Horizontal Vacuum Belt Filters 

In the mineral processing industry, Lead-zinc ore It is regarded as [due to its complex mineral composition, high proportion of fine particles, and strong clay content] “ Difficult to select, difficult to filter ” A typical example. Particularly in the mineral processing stage, achieving efficient dewatering and obtaining high-quality lead-zinc concentrate filter cakes from high-concentration, high-solids slurry systems is a critical step that significantly impacts mining operations' profitability and resource recovery rates. 

And in this segment, Horizontal Vacuum Belt Filter Machine Horizontal Vacuum Belt Filter , abbreviated as HVBF ) And high-performance industrial filter cloths Its combination has become an indispensable core solution in the lead-zinc concentrate filtration process. 

I. Pain Points in Filtration for Lead-Zinc Ore Beneficiation 

Lead-zinc ores are primarily composed of galena ( PbS ), sphalerite ( ZnS ) exist in the form of sulfide ores and are typically separated through processes such as crushing, grinding, and flotation, yielding lead concentrate and zinc concentrate. The characteristics of the pulp after flotation directly determine the complexity of the filtration process: 

1. Extremely fine particle size, with a large specific surface area : The average particle size is mostly within 5 ～ 20μm Between them, the particles easily form a compact flocculation layer, hindering the passage of the filtrate. 
2. High solids content with significant concentration fluctuations : The solid content of the concentrate slurry is typically 35% ～ 60% , which places extremely high demands on the vacuum level of the filtration equipment and the air permeability of the filter cloth; 
3. The mineral slurry has strong surface tension and is prone to foaming. : Foam and oil residue easily lead to filter cloth blockage, making it difficult to dewater the filter cake; 
4. Sulfur-containing and alkaline flotation reagents : Higher and more stringent requirements are placed on the chemical stability of filter cloths. 

Traditional plate-and-frame or ceramic filtration methods often encounter issues when processing lead-zinc concentrates. The filter cake has high moisture content, significant vacuum fluctuations, and frequent filter cloth blockages. 这些问题导致生产节拍受限、能耗上升 and increased filtration costs. 

II. Process Advantages of the Horizontal Vacuum Belt Filter 

The horizontal vacuum belt filter operates with Continuous operation, segmented washing, and automatic cake discharge These advantages make it widely used in the dewatering of both tailings and concentrates from metal ore beneficiation processes. Its core principle involves using a moving filter belt to support the filter cake; after the slurry is evenly distributed, vacuum filtration forms a filter layer, followed by multiple stages of washing, dewatering, and discharge—enabling continuous separation. 

In the lead-zinc concentrate filtration process, HVBF Its advantages are primarily reflected in the following aspects: 

1. Continuous vacuum filtration : Maintaining a stable filtration rate under high negative pressure conditions, enabling high throughput with low moisture content; 
2. Filter cake layer is controllable : By adjusting fabric thickness and vacuum level, the optimal dehydration state is achieved; 
3. Multi-stage washing system : The filter belt can be rinsed in sections, effectively removing residual chemicals and impurities, thereby enhancing the purity of the concentrate. 
4. The equipment features excellent sealing and operates smoothly. : Reduce secondary pollution and adapt to the humid and hot mining environment; 
5. Can be linked with the tailings return water system. : Promote water recycling to reduce energy consumption and environmental protection costs. 

This continuous filtration method has gradually become the mainstream choice in large and medium-sized beneficiation plants, particularly in the fields of non-ferrous metal ores such as lead-zinc, copper, molybdenum, and tin ores. 

III. The Critical Role of Industrial Filter Cloth in Lead-Zinc Concentrate Filtration 

Throughout the entire system, the filter cloth is the most important. “ Separation medium ” , its performance determines the efficiency of the vacuum belt filter and the quality of the filter cake. The unique properties of lead-zinc ore require the filter cloth to possess high mechanical strength, excellent air permeability, and good anti-clogging characteristics. 

1.  The core requirements for filter cloth 

• High air permeability : Maintain sufficient vacuum suction to ensure rapid discharge of the filtrate; 
• Good retention performance : Ensure that the concentrate particles do not get lost with the filtrate, thereby improving the recovery rate; 
• Acid and Alkali Resistance & Chemical Corrosion Resistance : Handling flotation reagents and mineral slurry pH Change; 
• Tensile and Wear-Resistant Properties : The filter cloth must operate continuously under high tension and mineral slurry friction; 
• Easy-to-Remove and Regenerative :The filter cake should fall off smoothly, and the filter cloth should be easy to clean for reuse. 

2.  Filter efficiency matched with filter cloth structure 

Lead-zinc ore pulp contains a large amount of fine-grained sulfides. If the filter cloth's weaving structure is not properly designed, it can lead to blockage of the filtrate channels and increased filtration resistance. Therefore, mining companies often employ Multilayer Composite Filter Cloth Or Single-filament plain-woven filter cloth To improve the stability of the filter layer structure while balancing breathability and strength. 

For example, in the concentrate slurry, the solid content can be as high as 55% Among the operating conditions mentioned above, using single-filament filter cloths with smooth surfaces and uniform pores can effectively reduce the moisture content of the filter cake, while also enhancing cleaning efficiency and extending service life. 

4. Citiuss CITIUS Professional solutions 

Xiamen Xedia Filter Materials Technology Co., Ltd. Xiamen CITIUS Filter Media Technology Co., Ltd. ) As a leading manufacturer in China's industrial filtration materials sector, we leverage over three decades of technological expertise to provide global mining clients with comprehensive, system-based filtration solutions. 

Considering the filtration characteristics of lead-zinc ore flotation concentrates, Citiuss CITIUS A dedicated series has been launched. —— Horizontal Vacuum Belt Filter Cloth System for Mineral Slurry Concentrate Filtration , targeted optimizations were made in filter cloth selection, structural design, and manufacturing processes: 

1. Structural Design Optimization 
   • Employing high-strength monofilaments + Double-layered weaving structure enhances support and drainage capability; 
   • The surface is smooth, with pore sizes precisely controlled to 30–80 μm Scope: Achieve rapid permeation and efficient retention; 
   • The underlying support fabric enhances wear resistance, ensuring stable operation over extended periods. 
2. High-precision machining technology 
   • Adopt Heat Setting and High-Frequency Edge-Sealing Technology , preventing deformation of the filter cloth edges and vacuum leakage; 
   • Seam is smooth, and the conductive strip is precisely positioned. , ensure the filter cloth maintains uniform tension during operation and does not deviate; 
   • Customizable guide belt width, wash water pathways, and drainage channel designs are available for different filter model types. 
3. Outstanding performance 
   • The filtrate has high clarity and low suspended solids content. <100 mg/L ；
   • The moisture content of the filter cake is lower compared to traditional filter cloths. 3~5% ；
   • Filter cloth usage cycle extended 30% Above, the cleaning frequency has been reduced. 20%。
4. System Integration and Services 
   Citius not only provides filter cloth products but also offers a comprehensive set of process support services, including: 
   • Filter cloth selection and slurry testing; 
   • Vacuum system optimization design; 
   • Filter cloth operation and cleaning strategy training; 
   • Online Monitoring and Operational Diagnosis. 
   
   

This kind of “ Filter cloth + System + Technology ” The integrated solution has been stably operating in numerous lead-zinc ore dressing plants both domestically and internationally, significantly boosting production capacity and economic benefits for mining clients. 

V. Typical Applications and Performance Achievements 

At a large lead-zinc flotation plant in the southwestern region, the mineral processing capacity is designed for daily ore treatment. 5000 Ton. 
The original system used a conventional rubber-belt vacuum filter equipped with domestically produced standard filter cloths, and it faced the following issues: 

• The filter cake has a moisture content as high as 18% , transportation and drying consume significant energy; 
• The filtrate is cloudy, and the reagent recovery rate is low. 
• The filter cloth has a short operational life and needs to be replaced once a month. 

Citiusas CITIUS After on-site research, it is recommended to use Citius-VBF285 Single-filament double-layer filter cloth , and carried out corresponding modifications to the filter cloth seams and vacuum tank structure. The operational results show: 

• The moisture content of the filter cake is reduced to 13.5% ；
• Improved clarity of the filtrate 50%；
• The filter cloth's service life is extended to its original length. 1.6 Twice; 
• Equipment annual operational stability rate improved by approximately 20%。

This achievement has significantly improved the company's concentrate recovery rate and energy consumption levels, earning high praise from customers. 

VI. Future Outlook: A New Direction for Intelligent and Green Mines 

As the digitalization and low-carbon transformation of mines advance, the filtration process in lead-zinc ore processing is moving toward Intelligence, precision, and sustainability Directional development. In the future, the integration of filter cloths and equipment will no longer be merely “ Physical dehydration ” , but instead forms a Intelligent filtering system that is monitorable, controllable, and optimizable 。

• Smart Monitoring : Real-time monitoring of filter cloth differential pressure, vacuum level, and air permeability to predict filter cloth lifespan and replacement cycle; 
• Functional Filter Fabric Material : Introducing nanofibers and surface modification technology to enhance anti-clogging performance and self-cleaning capabilities; 
• Energy-saving Recycling System : By utilizing vacuum residual pressure and thermal energy recovery technology, we further reduce operational energy consumption. 

Citiusas CITIUS Currently collaborating with domestic research institutions to develop a new generation. Intelligent Filter Cloth Monitoring System With Nanometer-scale filter material , helping mining enterprises achieve a better balance between production efficiency and environmental protection goals. 

Conclusion 

Efficient beneficiation of lead-zinc ores relies on precise filtration, and at the heart of this efficient filtration process lies the filter cloth. 
In a complex slurry system, a high-quality filter cloth represents not only filtration efficiency but also a company's operational costs, resource utilization, and its capacity for sustainable development. 

Xiamen Citiuss CITIUS With three decades of technological expertise, extensive experience in mining services, and continuous innovation and R&D, 
Is becoming a trusted partner in global non-ferrous metal mining filtration systems. 

In the wave of building green mines for the future, CITIUS Will continue to Professional industrial filter cloth and filtration equipment solutions ，
Bringing a new experience in solid-liquid separation to the lead-zinc mining industry—one that is more efficient, energy-saving, and environmentally friendly.