High Frequency Vibrating Screens are primarily used for dewatering, desliming, and classifying fine-grained, sticky materials, and are particularly widely used in the clean coal recovery process at coal preparation plants. Their high frequency and low amplitude effectively break down the surface tension of the material, achieving efficient dewatering. Coreal Machinery has compiled some information for your reference.
I. Core Features of High Frequency Vibrating Screens
- High Vibration Frequency: Typically 1500-3600 RPM, generates strong centrifugal force, facilitating moisture removal.
- Low Amplitude: Typically 0.5-3mm, prevents excessive material breakage and bouncing, ensuring a stable material layer on the screen surface and effective dewatering.
- Main Applications: Dewatering > Desliming > Classification.
II. Suitable Screening and Selection Recommendations for Different Types of Coal
1. Clean Coal
- Material Characteristics: Fine particle size, high moisture content, high viscosity, and high surface water content, making dewatering difficult.
- Process Step: Dewatering and recovery of clean coal after flotation or gravity separation.
- Most Suitable High-Frequency Screen Type: Vertical High Frequency Vibrating Screen (also known as High-frequency dewatering screen)
Recommendation:
- High-Efficiency Dehydration: Rapidly reduces the moisture content of clean coal products from ~30% to 15%-20% or even lower, significantly increasing product value.
- Large Processing Capacity: The processing capacity per unit area far exceeds that of traditional vacuum filters.
- Energy Saving and Environmental Protection: Compared to vacuum filters, energy consumption can be reduced by over 90%, and consumables such as filter cloths are not required.
2. Coal Slime
Material Characteristics: Extremely fine particles, high viscosity, high moisture content, and prone to clumping.
Process Step: Coal Slime Recovery, Tailings Dry Discharge.
Most Suitable High-Frequency Screen Type: High-Frequency Vibrating Fine Screen or Large Vertical High-Frequency Dewatering Screen
Recommendation:
- Fine Particle Recovery: Effectively recovers fine coal particles from water, reducing resource waste and environmental pollution.
- Deep Dehydration: Key equipment for achieving "closed-loop coal slurry water circulation" and "tailings dry discharge," producing a mud cake with a low moisture content.
3. Coarse Coal Slime
Material Characteristics: Particle size is between clean coal and lump coal, and also contains a high amount of moisture.
Process Step: Dewatering of coarse coal slurry.
Most Suitable High-Frequency Screen Type: Horizontal High-Frequency Vibrating Screen or Small Vertical High-Frequency Vibrating Screen
Recommendation:
- Balance between processing capacity and dewatering effect: For materials in this particle size range, horizontal screens can ensure sufficient processing capacity while achieving good dewatering results, and the equipment cost may be lower than that of vertical screens.
III. Summary of Key Selection Parameters
- 1. Processing Capacity: Determines the size and model of the screen.
- 2. Feed Particle Size Distribution: Determines the selection of screen mesh aperture.
- 3. Target Product Moisture: Determines the required screening area and vibration parameters.
- 4. Feed Slurry Concentration: Excessive concentration will affect dewatering efficiency and may require adjustment.
- 5. Screen Type: Polyurethane screens are the most common choice. The aperture ratio and aperture shape are crucial to dewatering effectiveness.
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