High Pressure Grinding Roll Technology
High-pressure grinding roll (HPGR) technology has its genesis in coal briquetting in the early twentieth century, but it was not until the mid-1980s that it was adopted for comminution applications, when it was applied in the cement industry to treat relatively easily crushed materials.
Generally, the primary motivation for the use of the HPGR as a comminution alternative is its energy efficiency when compared to conventional crushers and mills. This improved efficiency is due to the determinate and relatively uniform loading of the material in the HPGR compression zone, whereas the loading in conventional crushers and (particularly) tumbling mills is random and highly variable, and therefore inefficient.
High Pressure Grinding Roll Technology
Machine Design
The HPGR machine comprises a pair of counterrotating rolls mounted in a sturdy frame. One roll is fixed in the frame, while the other is allowed to float on rails and is positioned using pneumohydraulic springs. The feed is introduced to the gap between the rolls and is crushed by the mechanism of interparticle breakage.
The pressure exerted by the hydraulic system on the floating roll largely determines comminution performance. Typically, operating pressures are in the range of 5–10 MPa, but can be as high as 18 MPa. For the largest machines, this translates to forces of up to 25,000 kN.
The rolls are protected with wear-resistant surfaces, and the ore is contained at the roll edges by cheek plates.
Applications of HPGR machine
The HPGR machines is ideal for crushing hard rock with relatively low moisture content and can provide superior results in the size reduction of a variety of minerals. Currently, HPGR technology is successfully operating in number of applications, including diamonds, iron ore, gold, copper, platinum, molybdenum and industrial minerals.
- Tertiary crusher, followed by a ball mill or Impact Crusher
- Quarternary crusher, followed by a ball mill or Cono Crusher
- Pebble crusher in a SAG/AG, ball mill circuit
Tagged: High Pressure Grinding RollHPGR for Ore processingHPGR Machines
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