Cryogenic pulverizers are specialized equipment used to crush brittle materials like granite, basalt, or recycled concrete at ultra-low temperatures (-196°C with liquid nitrogen). This technology enhances particle uniformity and reduces wear on components, making it ideal for high-purity sand and aggregate production.
A typical cryogenic crushing line includes:
1. Pre-Crusher: Coarse jaw/impact crusher for initial size reduction.
2. Cryogenic Feeder: Introduces liquid nitrogen to embrittle materials.
3. Cryogenic Pulverizer: Core unit with tungsten carbide hammers (e.g., 50–200 HP motor, throughput 5–30 TPH).
4. Screening System: Multi-deck vibratory screens for grading (0–5mm sand, 5–20mm aggregate).
| Parameter | Value |
|---|---|
| Max Feed Size | 100mm |
| Output Size | 0.1–10mm (adjustable) |
| Liquid Nitrogen Consumption | 0.5–1.5L/kg material |
| Power Requirement | 75–250 kW |
– Lower Dust Emission: Ideal for urban recycling plants.
– Higher Cubicity: Improved concrete strength due to angular particles.
– Extended Wear Life: Hammer lifespan increases by 300% versus room-temperature crushing.
Q: Can it process asphalt shingles?
A: Yes, but pre-shredding to <50mm is recommended.
Q: Is the system energy-intensive?
A: Liquid nitrogen costs offset reduced mechanical wear; ROI improves for hard abrasives (>7 Mohs).
– Challenge: Produce ASTM C33-compliant sand from demolition waste.
– Solution: Cryogenic pulverizer + air
