High Pressure Grinding Roll

Advanced High Pressure Grinding Roll (HPGR) for Mineral Processing

The High Pressure Grinding Roll (HPGR) represents a revolutionary shift in energy-efficient mineral comminution. Designed to handle hard rocks and ores, this advanced HPGR Crusher utilizes the principle of inter-particle comminution to crush material, rather than relying solely on the metal surface of the rollers.

By applying extreme hydraulic pressure to a continuous bed of ore, the High Pressure Roll Crusher generates extensive micro-fractures within the particles. This micro-fracturing dramatically weakens the ore, leading to a 20% to 30% reduction in energy consumption in downstream Ball Mills and significantly improving mineral liberation for downstream leaching or flotation processes.

Ideal for processing iron ore, gold ore, copper, diamond, and cement clinker, our HPGR in Mineral Processing circuits delivers high throughput, exceptional availability, and the lowest possible operating expenditures (OPEX) in the industry.

Key Advantages of Our HPGR Crusher

• Massive Energy Savings: Replaces tertiary crushers and drastically reduces the workload on grinding mills, saving 20-30% in overall comminution energy.
• Micro-Fracturing Technology: The extreme inter-particle pressure creates internal cracks in the ore, which significantly increases the recovery rates in heap leaching and gravity separation circuits.
• Autogenous Wear Layer (Studded Rolls): We offer advanced studded roller surfaces. As the ore is crushed, a layer of material becomes trapped between the tungsten carbide studs, creating a "rock-on-rock" wear layer that protects the roller steel, extending its lifespan to thousands of hours.
• High Throughput & Compact Design: Provides incredible processing capacities in a surprisingly compact footprint compared to conventional crushing and grinding mills.

How an HPGR Works (Inter-Particle Comminution)

1. Choke Feeding: Raw ore is choke-fed continuously into the gap between two large, counter-rotating rollers from a hopper above.
2. Hydraulic Pressurization: One roller is fixed, while the other is movable and supported by heavy-duty hydraulic cylinders. The hydraulic system applies massive pressure (up to 300 MPa) to the movable roller.
3. Inter-Particle Crushing: Unlike standard crushers that break rocks between steel plates, the HPGR forces the rocks to crush against each other in a dense material bed. This creates a highly compacted "cake" full of micro-fractures.
4. Discharge: The compacted ore cake is discharged at the bottom, which is then usually sent to a de-agglomerator or directly into the grinding circuit where it falls apart easily.

Applications of HPGR in Mineral Processing

The High Pressure Grinding Roll is transforming flowsheets across the mining sector:

• Gold & Copper Mining: Generates micro-fractures that allow leaching chemicals to penetrate the ore faster, increasing metal recovery.
• Iron Ore Pelletizing: Fine crushing of iron ore concentrates to increase the specific surface area prior to pelletizing.
• Diamond Processing: Gently crushes the host rock through inter-particle pressure without breaking the valuable, hard diamonds.
• Cement Industry: Pre-grinding of cement clinker and slag to drastically improve the efficiency of finish grinding mills.

Technical Specifications

We offer HPGRs configured with advanced studded roller faces for hard rock, or smooth/welded faces for softer materials. Below are the general parameters of our high-pressure roll units.

Frequently Asked Questions (FAQ)