Grinding mills are essential equipment in mineral processing, cement production, and other industries where size reduction of materials is required. Below is a general specification overview for different types of grinding mills:
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1. Ball Mill
– Purpose: Fine grinding of ores, cement, limestone, etc.
– Key Specifications:
– Diameter: 0.5–8 m
– Length: 1–15 m
– Capacity: 0.5–500 TPH (tons per hour)
– Rotation Speed: 70–80% of critical speed
– Power Requirement: 50–10,000 kW
– Grinding Media: Steel balls (chrome steel, ceramic)
– Feed Size: <25 mm (varies by application)
– Discharge Type: Grate or overflow
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2. Rod Mill
– Purpose: Coarse grinding (primary stage before ball mill).
– Key Specifications:
– Diameter: Up to 4.5 m
– Length/Diameter Ratio: ~1.5:2 to prevent tangling of rods
– Capacity: Lower than ball mills (~100 TPH max)
– Rotation Speed: ~60% of critical speed
– Grinding Media: Steel rods (longer than mill length)
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3. SAG Mill (Semi-Autogenous Grinding)
– Purpose: Primary grinding in mining (uses ore + steel balls).
– Key Specifications:
– Diameter: Up to 12+ m (large-scale mining)
– Power Requirement: Up to ~30 MW (e.g., Metso’s Ø12.2m x 6.1m SAG mill)
– Feed Size: Up to ~300 mm (with added steel balls)
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4. Vertical Roller Mill (VRM)
– Purpose: Cement, coal, slag grinding (energy-efficient).
– Key Specifications:
– Roller Diameter: Up to ~3 m
– Table Diameter: Up to ~6 m.jpg)
– Capacity: Up to ~600 TPH for cement raw meal/coal
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5. Hammer Mill
– Purpose: Coarse to medium grinding (agriculture, biomass