Here’s a simplified diagram and explanation of coal cleaning equipment used in coal preparation plants (CPP). The process removes impurities (ash, sulfur, rock) to improve coal quality.
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Coal Cleaning Process Diagram (Simplified)
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1. ROM Coal (Raw Coal)
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2. Crusher / Sizer (Size Reduction)
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3. Screening (Vibrating Screens) → Oversize → Re-crush
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4. Density Separation:
├─ Heavy Media Cyclone (Dense Medium Separation)
├─ Jigging Machine (Pulsating Water)
└─ Froth Flotation (Fine Coal)
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5. Dewatering:
├─ Centrifuge (Coarse Coal)
└─ Filter Press / Thickener (Slurry)
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6. Clean Coal (Low Ash) → Storage/Transport
Impurities → Rejects (Waste Rock, Slurry)
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Key Equipment Explained:
1. Crushers/Sizers: Break large coal into smaller pieces for processing.
2. Screens: Separate coal by size (e.g., vibrating screens, trommels). Oversize material is re-crushed.
3. Density Separators: Remove impurities based on density differences:
– Heavy Media Cyclones: Use a magnetite-water mixture to separate heavy impurities.
– Jigs: Pulsate water to stratify coal (lighter coal floats, heavier rocks sink).
– Froth Flotation: For fine coal; uses chemicals to separate coal from minerals.
4. Dewatering Equipment: Removes water from cleaned coal:
– Centrifuges (for coarse coal).
– Filter Presses/Thickeners (for slurry).
5. Waste Handling: Rejects (rocks, slurry) are disposed of in impoundments or recycled.
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Visualization Tip: For a detailed diagram, search:
– “Coal Preparation Plant Flow Sheet” for industry-standard layouts.
Would you like details on a specific equipment type?