Mining
1 million tons/year slag powder ball mill scheme
21/11/2025
1.Core process: Pre-grinding + ball milling
The combined grinding system of “roller press + ball mill” is adopted to achieve high efficiency and energy saving.
2.System Flow
Wet slag → Roller press (pre-grinding & drying) → Ball mill (fine grinding) → High-efficiency classifier (sorting) → Finished product
3.Key Equipment
Roller press: Pre-crushing and drying to reduce particle size and moisture content entering the mill.
Ball mill: Ø4.2x13m and above, responsible for the final product quality.
High-efficiency classifier: Forms a closed-loop circulation, improving grinding efficiency.
4.Core Advantages
High yield: Hourly output ≥ 125 tons.
Low power consumption: System power consumption can be controlled below 40 kWh/t.
Stable quality: The closed-loop system facilitates precise control of the finished product’s fineness.
5.Main equipment list
| No. | Equipment Name | Specifications / Key Parameters | Main Function | Remarks |
|---|---|---|---|---|
| 1. Batching System | ||||
| 1.1 | Slag Silo & Feeder | Effective capacity ≥ 1500m³, VFD control | Store wet slag and feed steadily | With arch-breaking device |
| 1.2 | Gypsum Silo & Feeder | Effective capacity ≥ 200m³ | Store gypsum and precise batching | |
| 2. Pre-grinding System | ||||
| 2.1 | Roller Press | Throughput ≥ 250 t/h, Roller width ≥ 1.4m | High-pressure crushing of materials | Core energy-saving equipment |
| 2.2 | Stable Flow Weighing Hopper | Capacity ~ 50 tons | Ensure continuous, stable feeding | |
| 2.3 | Hot Air Furnace | Provide ~ 300°C hot air | Provide heat source, dry materials | Can utilize waste heat |
| 3. Ball Mill System | ||||
| 3.1 | Ball Mill | Ø4.2m × 13m, Power ~ 3500 kW | Fine grinding of pressed cake | Core grinding equipment |
| 3.2 | Mill Main Motor | Power ~ 3500 kW | Provide power for the mill | |
| 3.3 | High-Low Pressure Lubrication Station | Ensure safe startup and operation | ||
| 4. Classification & Dust Collection System | ||||
| 4.1 | High-Efficiency Separator | Air volume ≥ 400,000 m³/h | Classify materials, return coarse powder | Ensure product fineness |
| 4.2 | Main Dust Collector | Air volume ≥ 450,000 m³/h | Collect product, separate gas and solid | |
| 4.3 | Main Exhaust Fan | Air volume ~ 500,000 m³/h, Pressure ~ 7500 Pa | Provide airflow for the system | VFD control |
| 5. Product & Conveying System | ||||
| 5.1 | Air Slide / Screw Conveyor | Transport materials within system | ||
| 5.2 | Bucket Elevator | Capacity ≥ 200 t/h | Vertical lifting of materials | |
| 5.3 | Storage Silo Top Conveying Equipment | Transport product to storage silo | ||
| 5.4 | Silo Bottom Loading System | For bulk loading to trucks | ||