It sounds like you’re referring to equipment used in coal processing, specifically for dewatering and sizing coal particles. Here’s a breakdown of the terms you mentioned:
1. Vibratory Screen (for Coal)
– Purpose: Used to separate coal particles by size (e.g., coarse vs. fine) or remove moisture.
– How it Works: A vibrating screen uses high-frequency vibrations to classify and dewater coal. The screen deck(s) have specific apertures to allow finer particles to pass while retaining larger ones.
– Applications:
– Sizing raw coal before washing.
– Dewatering washed coal (e.g., removing surface moisture).
– Scalping off oversized material.
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2. Coarse Coal Centrifuge
– Purpose: Removes water from coarse coal (typically >0.5 mm) after washing (e.g., from dense medium cyclones or jigs).
– Types:
– Screen Bowl Centrifuge: Combines a solid bowl and a screen section—ideal for finer coal.
– Vibratory Centrifuge: Uses vibration to enhance drainage (less common for coarse coal).
– Basket Centrifuge: Best for coarse coal, where centrifugal force expels water through perforated baskets.
– How it Works:
– Coal slurry is fed into a rotating bowl/basket.
– Centrifugal force pushes water outward through screens, while solids are discharged.
Key Differences:
| Feature | Vibratory Screen | Coarse Coal Centrifuge |
|——————|——————————–|———————————-|
| Function | Size classification & dewatering | Primarily dewatering |
| Particle Size| Broad range (fine to coarse) | Coarse (>0.5 mm typically) |
| Moisture Reduction | Moderate (~10–15%) | High (~5–10% residual moisture) |
| Mecha.jpg)
m | Vibration + screening | Centrifugal force + drainage |
Common Use Cases in Coal Preparation:
– Vibratory Screen:
– Pre-wash sizing (e.g., separating lump coal from fines).
– Post-wash dewatering of small coal.
– Coarse Coal Centrifuge:
– Final dewatering of washed coarse coal before stockpiling/transport.
– Often paired with dense medium cyclones.
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