Ball tube mills are critical equipment in coal-fired power plants and sand/aggregate processing lines where coal is used as fuel. This article explores the optimized design for coal grinding in sand production systems.
The mill consists of:
– Rotating drum (3.5-4.5m diameter)
– Steel balls (30-60mm diameter)
– Classifier system
– Coal feed mechanism
– Discharge system
| Parameter | Value Range |
|---|---|
| Capacity | 10-50 t/h |
| Motor Power | 500-2000 kW |
| Rotation Speed | 15-25 rpm |
| Coal Fineness | 70% passing 200 mesh |
In aggregate plants, ball tube mills typically feed:
1. Rotary dryers for sand processing
2. Kilns in cement aggregate production
3. Direct combustion systems
Q: What’s the optimal coal moisture content?
A: Ideal range is 8-12%. Higher moisture reduces grinding efficiency.
Q: How often should balls be replaced?
A: Typically every 6-12 months depending on throughput.
A 500tph sand production facility implemented two Φ3.8×7m ball tube mills for coal grinding, achieving:
– Stable combustion at 1200°C
– 18% reduction in fuel consumption
– Consistent product quality in final aggregates
