High pressure grinding rolls are an energy efficient grinding solution, and now has improved this technology even further. The HRC™, our innovative approach to HPGR technology, is like no other HPGR on the market.
The high-pressure interparticle comminu-tion in the POLYCOM® is based on the following principle: Brittle material particles are fed to the POLYCOM® through a feed bin. The grinding elements are two counter-rotating rolls, between which the material is crushed. One roll is designed as a fixed roll and the other one as a floating roll.
Use of the high-pressure grinding roll for finish grinding achieves the greatest energy savings, which can be as high as 50%, compared with conventional tube mill systems. Feed material with up to 4% moisture content is dried in the separator. Material with higher moisture contents is dried in a separate unit, for instance a shaft-type flash dryer.
High Pressure Roller Mills are used in the cases of medium-fine crushing of hard materials such as ceramics, minerals from 5 up to 9 on the Moh's hardness scale, metals and metal alloys. High Pressure Roller Mills are used in continuous operation or in a closed circuit with screening machines or classifiers.
Primary grinding in the high-pressure grinding roll increases the capacity of an existing dry ball mill operation. Even greater increases in capacity can be achieved if the Polycom is operated in hybrid mode.
roll constitutes the basic principle of high-pressure comminution with a roll press. The extent of the roll movement (roll gap) is a function of the pressing force generated by the hydraulic system in relation to the reaction forces exerted by the processed material. This design feature guarantees
The compressive nature of the HPGR mechanics causes the rock to typically crack and cleave along the grain boundaries, weakening the rock structure and exposing the ore particles. This high pressure also creates a large number of fines and causes the formation of microcracks in the larger particles.