Can roll crusher crush steel slag? The answer to this question is yes, the roll crusher with its high efficiency and reliability has become one of the preferred equipment for crushing steel slag. Double-roller crushers are suitable for crushing steel slag, but their applicability depends on slag characteristics and equipment performance. Below is a detailed analysis:
Double Roller Crusher
1. Applicability Analysis
A. Compatibility with Steel Slag Properties
Steel slag typically has high hardness (compressive strength: 150-200 MPa) and brittleness. Double-roller crushers utilize dual-roller shearing and compression forces to effectively break down such materials, especially for medium-to-fine particle size requirements (e.g., ≤10 mm). For instance, tests show that adjusting roller gaps can crush steel slag to 1-3 mm, meeting sintering or grinding process needs.
B. Equipment Performance
- Wear Resistance: Rollers made of high manganese steel or chromium alloys, enhanced with hardfacing technology, withstand abrasion from metallic components in slag.
- Overload Protection: Hydraulic systems automatically retract rollers to avoid damage from oversized slag blocks.
2. Core Advantages
A. Precise Particle Size Control
Adjustable roller gaps (1-40 mm) enable flexible output customization (e.g., 3-5 mm for cement raw materials or 1-3 mm for sand-making). Post-adjustment, slag uniformity exceeds 90%, minimizing over-crushing.
B. Economic and Environmental Benefits
- Low Energy Consumption: Energy use is 0.5-0.8 kW·h/ton, 30-50% lower than impact crushers.
- Eco-Friendly Design: Sealed structures and dust removal ports limit dust emissions to ≤10 mg/m3, with noise below 75 dB.
C. Easy Maintenance
Modular designs simplify roller replacement, reducing maintenance costs by 50% compared to cone crushers.
3. Limitations and Precautions
A. Pre-Treatment Requirements
Oversized slag blocks (>50 mm) require jaw crushers for primary crushing to avoid feed port clogging.
B. Moisture and Stickiness Control
Slag moisture must be ≤8%. Scraper designs or drying processes prevent roller adhesion.
C. Wear Part Lifespan
High-hardness slag accelerates roller wear. Regular inspections and hardfacing repairs are recommended, with typical roller lifespans of 3,000-5,000 hours.
4. Comparison with Other Equipment
| Equipment Type | Application | Advantages | Disadvantages |
|---|---|---|---|
| Double-Roller Crusher | Medium/fine crushing (≤10 mm), high-hardness slag | Precise control, low maintenance, energy-efficient | Requires pre-crushing for large blocks |
| Jaw Crusher | Primary crushing (≤50 mm) | Handles large slag blocks | Coarse output (≥10 mm) |
| Cone Crusher | High-capacity, ultra-hard materials (>200 MPa) | High wear resistance, high yield | Complex maintenance, high energy use |
5. Equipment Selection Recommendations
- Small/Medium Slag Processing Lines: Opt for hydraulic double-roller crushers (e.g., SJSGP Series) paired with vibrating screens for integrated crushing-screening.
- High-Hardness Slag Scenarios: Choose rollers with hard alloy coatings and smart hydraulic adjustment systems.
- Strict Environmental Zones: Prioritize fully sealed models with dust removal systems (e.g., pulse bag filters).
Double roller crushers are ideal for crushing steel slag with ≤200 MPa compressive strength and 1-10 mm particle size requirements, offering precision, energy efficiency, and ease of maintenance. However, pre-treatment for oversized blocks and moisture control are critical. For ultra-fine crushing (<1 mm), consider multi-stage processes (e.g., jaw crusher + roller crusher + ball mill).
