Improved Grinding, Crushing, and Comminution: High Pressure Grinding Rolls (HPGRs)
HPGRs are one of the latest and most efficient technologies at performing size reduction and material liberation.
Overview
What are HPGRs?
Since the 1980s, High Pressure Grinding Rolls (HPGRs) have enhanced grinding efficiency across industries like mining, cement, and mineral processing. HPGRs outperform traditional methods in size reduction and material liberation.
How HPGRs Work:
An HPGR consists of two rolls that rotate inward towards each other. One roll is fixed in place, while the other is floating and able to move closer or further away from the other. (Figure 1)
High pressure is applied to the floating roll through hydraulic cylinders while material is choke fed into the space between the two rolls using a gravity feeder arrangement. (Figure 2)
As the material passes between the rolls, some material sticks, forming an autogenous wear layer on the rolls. Consequently, the additional feed material is then compressed between the two autogenous wear layers. High pressure is transferred from the hydraulic cylinders, through the rolls, through the wear layers, and ultimately onto the feed material causing it to crack and break into smaller fragments. (Figure 3)
Benefits
Hardware & Machinery
Lab Machine
The KOMAREK KR-330 HPGR is specifically engineered for laboratory research, pilot plant operations, and low-capacity production applications. Featuring a rugged industrial design, the KR-330 stands out as one of the most durable small-scale HPGRs on the market. Like all KOMAREK KR-HPGR models, it is built for maximum reliability and ease of operation, maintenance, and accessibility.
Ideal for research laboratories, pilot-scale testing, and production environments, the KR-330 enables precise control of key process variables—including roll speed, pressure, and roll gap. This flexibility allows users to develop and optimize high-pressure grinding and comminution solutions for a wide range of materials, including ores, metals, minerals, aggregates, and chemicals.
Features:
- Frame mounted for easy transportation and installation
- Hydraulic system including accumulators, cylinders, pump assembly, and reservoir
- Drive train include motors, gearboxes, torque liming safety couplings, and cardan shafts
- Gravity fed feeder assembly with spring loaded cheek plates
- Tungsten carbide studded rolls
- CE certified for many international installations when required
KR-Series
The KOMAREK KR-HPGR Series was specifically engineered to meet the growing demand for energy-efficient size reduction equipment across a wide range of material production and processing applications. Designed with a focus on smaller capacity needs, the KR-HPGR line spans from lab-scale machines processing 1–5 TPH to larger units handling up to 70 TPH.
Featuring a robust design and highly efficient operation, the KR-HPGR Series delivers consistent, high-pressure grinding for effective comminution, crushing, and material size reduction. It is a trusted solution for industries that prioritize both performance and sustainability.
As part of the Köppern Group, KOMAREK also offers larger-scale HPGR systems outside the KR-Series, with capacities exceeding 5,000 TPH.
Industries
