In copper ore processing, mills are critical for size reduction and mineral liberation. The most common types are ball mills, SAG mills, and vertical roller mills, each serving specific stages in the crushing-grinding circuit.
1. SAG Mills: Primary grinding with 8-15% steel balls
– Diameter: 5-12m
– Power: 500-28,000 kW
– Feed size: ≤250mm
– Product size: 1-3mm
2. Ball Mills: Secondary grinding
– Rotation speed: 70-80% critical speed
– Liner types: Rubber/metal composite
– Capacity: Up to 300 t/h
3. Vertical Roller Mills: Energy-efficient alternative
– Specific power consumption: 30% lower than ball mills
– Moisture tolerance: Up to 20%
| Stage | Equipment | Key Parameters |
|---|---|---|
| Primary Crushing | Jaw Crusher | Feed opening: 1500×2000mm |
| SAG Milling | Φ10×5m SAG Mill | Motor power: 5500kW |
| Ball Milling | Φ4×6m Ball Mill | Cylinder speed: 15rpm |
| Classification | Hydrocyclones | Cut size: 75μm |
| Flotation | Tank Cells | Volume: 160m³ each |
Q1: What’s the optimal ball charge for copper ore grinding?
A: Typically 28-32% of mill volume for SAG, 40-45% for ball mills.
Q2: How to reduce over
