High Pressure Grinding Rolls
High Pressure Grinding Rolls (HPGR) are highly efficient, energy-saving devices for crushing and grinding ores and minerals, often used as alternatives to traditional tumbling mills. They utilize two counter-rotating rollers to compress material through high-pressure interparticle crushing, resulting in reduced energy consumption, increased throughput, and, in many cases, superior product quality.
Design and working principle
Comminution principles: high pressure comminution and breakage process between rollers
- HPGR is pressure controlled, not gap controlled
- Product size is changed by controlling the pressure
- Size reduction by inter-particle grinding
- Inter-particle grinding increases grinding efficiency as pressure is transferred to the particle via multiple directions
- Breaking and fracturing of particles only happens when the material compressive strength is exceeded. Pressure controlled HPGR assures that the right pressure is applied for the specific material
- HPGR streamlines transition between crushing and grinding by accepting larger feed size than ball mills and producing finer size particles than cone crushers.
Technical data
Mechanism: Material is fed between two rollers—one fixed, one floating—that apply high pressure, causing particles to break against each other (interparticle grinding), rather than just against the machine surface.
Benefits:
- Energy Savings: Up to 50% less energy compared to conventional grinding circuits.
- Higher Throughput: Efficient for large-scale operations and increasing overall plant capacity.
- Improved Recovery: Creates micro-cracks in minerals, enhancing downstream leaching and flotation performance.
- Reduced Wear: Lower maintenance costs compared to SAG mills, with long-lasting studded tires that form a protective layer.
Specification
Technical details
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Roller diameter: 200 mm to 1,100 mm Working width 50 to 1,200 mm Drive unit 11KW 50 500KW Feeding Gravity feeding, screew feeding for optional throughput capacity Throughput Capacity 0.2-120t/h ++
HPGR GR 36 GR 60 GR 85 GR 180 GR 300 GR 450 Max. press force (kN) 360 600 850 1800 3000 4500 Roller diameter (mm) 300 400 520 712 850 1100 Throughput in t/h 0,5 - 1,2 0,8 - 5 2-8 5-15 8-30 20 - 80
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