Pilot HPGR Grinding

Pilot HPGR GRINDING

High Pressure Grinding Rolls (HPGR) is a mature technology that is proven to reduce capital and operating costs in full scale plants when compared to other comminution technologies. FIMRC comminution experts have developed a simple testing methodology to avoid some of the difficulties associated with using HPGR.

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HPGRs have been used for many years and are emerging as an energy-efficient alternative to conventional and AG/SAG comminution and regrinding circuit. One of the interesting features of HPGR is its capability to produce a particle size distribution with a greater than typical amount of fines, thus reducing the power requirement for the downstream ball mill. This makes the use of standard ball mill analyses based on the K80 inadequate, unless appropriate corrections are made.

HPGR
The most appropriate way to get around this data problem is to run the entire circuit at pilot-scale and analyze the data based on the overall power applied in kWh/t. The total power for the HPGR system can be compared to that of a conventional circuit, based on the ball mill work index and the Third Theory of comminution.
The power comparison can also be done against AG/SAG mills. This methodology has only been used to scope the potential energy savings of HPGR.

We conduct pre-grinding and re-grinding HPGR testing in combination with other bench-scale tests and circuit simulation.  The use of different test procedures and design methodologies provides you with a bankable solution that is unmatched in its rigor.