Northern France’s coal mining legacy has left vast quantities of waste rock and tailings. Modern crushing/sand-making technology can transform these materials into high-quality aggregates for construction.
For processing coal mining waste (typically 200-500mm), we propose:
1. Primary Jaw Crusher
– Model: JC98
– Feed size: ≤650mm
– Capacity: 85-275 t/h
– Power: 110kW
2. Secondary Impact Crusher
– Model: PFQ1315
– Rotor diameter: 1300×1500mm
– Capacity: 180-280 t/h
3. Tertiary VSI Sand Maker
– Model: S10
– Max feed: 50mm
– Sand yield: 60-140 t/h
1. Pre-screening with grizzly bars (>300mm recrushed)
2. Two-stage crushing to ≤40mm
3. VSI shaping for cubic aggregates (0-5mm sand, 5-20mm gravel)
4. Air density separator removes residual coal particles
| Product | Size (mm) | Flakiness Index | LA Abrasion (%) |
|—————-|———–|—————–|—————–|
| Coarse sand | 0-5 | <8% | ≤18 |
| Fine aggregate | 5-20 | <12% | ≤22 |
Q1: How to control coal contamination in final products?
A: Install sensor-based sorting before tertiary crushing, achieving >95% purity.
Q2: Optimal moisture content for VSI operation?
A: Maintain 3-5% moisture to prevent dust while ensuring crushing efficiency.
Nord-Pas-de-Calais Aggregate Plant processed 1.2Mt/year of mining waste into EN-standard concrete aggregates, achieving:
– 78% material recovery rate
– 22% reduction in processing energy vs conventional methods
– Final products used in Channel Tunnel ancillary constructions
