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High pressure grinding rolls (HPGR) are used for particle reduction in mining operations and aggregates production. Known for energy efficient reduction, HPGRs are most often utilized when the processed material is hard rock. However, they can also refine softer materials like industrial minerals. The smaller models of the HPGRs are particularly productive in producing manufactured sand for asphalt and concrete production.
Mining operations. Industrial minerals processing. Manufactured sand production for asphalt and concrete production.
An intelligent flange design to maximize material intake. A patented arch-frame to eliminate downtime caused by skewing.
Reduced operating costs
No need for grinding media. Continuous material stream. Direct feed to the crushing zone.
Less required service. Design that allows changing critical parts simply and easily.
A step change in energy efficiency
Metso's family of high pressure grinding rolls (HPGR) is called Metso HRC™.
The latest generation of Metso HRC™ machines is designed to increase the energy efficiency and throughput, while decreasing the total cost of operations.
The animation presents how the HPGR technology has developed over the years and the most beneficial features of Metso HRC™.
HPGR for mining operations
HPGR helps you to get more value from every ton of ore with the sheer production capacity and state-of-the-art features.
They can be used in a wide range of mining applications:
- Hard rock
- Industrial minerals
HPGR for aggregates production
The smaller HPGR models, HRC™ 8 and HRC™ 800, are specifically designed to meet the needs of aggregate and industrial minerals applications.
They can produce high-quality manufactured sand for asphalt and concrete production.
- High-quality cubical aggregate for all reduction ratios and fractions
- Consistent production
- Low noise and less dust generated
- Low energy and wear consumption
- Capability to process hard rock, soft rock, construction waste, and abrasive materials like limestone, river gravel, granite and basalt
Robust Metso HRC™ high pressure grinding rolls (HPGR)
High pressure grinding rolls (HPGR) are used for size reduction or rocks and ores. They compress the feed material between two rotating rollers, one of which is in a fixed position and another roller that is floating.
The two rotating rollers generate such a high pressure that it grinds the feed material to the desired smaller grain size.
Metso's high pressure grinding rolls are known as Metso HRC™. They come in many sizes depending on your application and process needs.
Metso's HRC™ can provide a notable increase in throughput. The flange design maximizes the amount of material that is crushed by pulling the feed into the crushing zone. This method prevents the material passig the rollers and increases efficiency and throughput.
The patented arch-frame, on the other hand, eliminates downtime caused by skewing.
One can also adjust the speed and pressure of Metso HRC™ depending on the material conditions and application requirements.
Thanks to the ability to handle a continuous stream of material, HPGRs are considered to be energy efficient grinding machines in general.
Metso's HRC™ equipment goes a bit further. They direct the feed material straight to the crushing zone and adjust the speed and pressure in order to avoid wasting energy.
Reduced operating costs
Compared to classical grinding mills, HPGRs don't require grinding media. Furthermore, Metso HRC™ grinding rolls are known for robustness and longevity of wear components.
The anti-skewing arch frame design prevents bearings from being damaged due to misalignment, which will also safe effort and resources.
Safe and ease of maintenance
The key for improving safety during maintenance is to minimize the need for maintenance.
With Metso HRC™ HPGR, downtime has been reduced by using robust components and for example studded tungsten carbide surface, which creates an optimal wear resistance for longevity.
The required service is made easy with a simple design that allow changing the critical parts easily.
Building the world's largest HPGR
Metso HRC™3000 is a new generation high-pressure grinding roll that eliminates issues found in traditional HPGRs, allowing the mining industry to reach a new level of energy efficiency.
The world's largest HPGR was installed at Freeport-McMoRan’s Morenci site in Arizona, USA.
Watch the video of the installation and visit a customer case Building the world’s largest HPGR to learn more.
Metso HRC™ HPGR technical specifications
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