Sources & References
Huayun Wire Mesh Wedge Wire Screen General Manufacturing Specification
Huayun Wire Mesh Process Engineering Department
Referenced for profile wire cross-section, support rod layout, and welded structure details.
Huayun Wire Mesh Coal Preparation Dewatering Project Site Follow-up Records
Huayun Wire Mesh After-sales Department
Used to compile dewatering and medium recovery throughput data and maintenance recommendations.
Huayun Wire Mesh Stainless Steel Material Compatibility Records
Huayun Wire Mesh Technical Department
Referenced for SUS304 / SUS316L material selection boundaries across different slurry environments.
Scope & Limitations
Intended for initial wedge wire screen selection in coal preparation, dewatering, medium recovery, and medium-to-high open area filtration applications. Specific slot width and support structure must still be verified against flow rate, differential pressure, and slurry characteristics.
View Factory & Quality Commitments
View Factory & Quality CommitmentsWhat Is a Wedge Wire Screen (Johnson Screen)?
A wedge wire screen is an industrial filtration element made from V-shaped profile wire as the filtering unit, resistance-welded onto support rods using fully automated equipment. The name traces back to 19th-century American engineer Edward E. Johnson, who originally developed the design for water well filtration. It has since become widely used in mining, coal preparation, petrochemicals, and wastewater treatment.
Structural Advantages of V-Profile Wire
Standard woven mesh has square aperture cross-sections — particles that enter the opening can easily become wedged. Wedge wire screens use triangular-profile wire that forms slots which are narrow at the top and wider toward the base. A particle slightly larger than the slot opening is stopped cleanly at the surface without becoming trapped; particles slightly smaller pass through freely. This geometry dramatically reduces blinding compared to conventional mesh.
Key Performance Parameters
| Parameter | Typical Range | Notes |
|---|---|---|
| Slot Width | 0.1–10 mm | Defines filtration precision; designed to the material's D50 |
| Effective Open Area | 20–60% | Typically 15–25% higher than equivalent-aperture woven mesh |
| Maximum Working Pressure | 0.6–1.2 MPa | Depends on support rod specification |
Coal Preparation Dewatering Applications
Dewatering: Clean coal is separated from process water using curved screens or centrifuges. The high open area of wedge wire screens increases throughput per unit area by more than 20%, while SUS316L construction withstands prolonged exposure to acidic slurry (pH 4–6).
Medium Recovery (Desliming): In dense medium separation circuits, wedge wire screens recover magnetite powder from the process medium. Slot widths of 0.5–1.0 mm accurately retain medium particles, with medium recovery rates typically exceeding 98%.
Maintenance Guidelines
- Regular flushing: High-pressure wash along the slot direction at the end of each shift.
- Weld point inspection: Focus on edge zones where vibration amplitude is greatest.
- Wear measurement: Check slot width with feeler gauges every quarter; replacement is recommended when wear exceeds 15% of nominal slot width.
- Installation orientation: Orient the V-profile wire with the wider face toward the material flow direction to ensure the wedge effect functions correctly.
Selection Recommendations
- Slot width: Size at 0.7–0.9× the target separation particle diameter to allow a wear margin.
- Material: Specify SUS316L for acidic slurry environments; SUS304 is suitable for neutral conditions.
- Support rod orientation: Transverse support suits curved (banana) screens; longitudinal support suits flat-deck vibrating screens.