High Pressure Grinding Rolls (HPGR) rollers start to wear over a period of time, based on factors such as ore characteristics, operating pressure, feed material size and non-uniform feed presentation across the roller width.
The rate of wear amongst the two rollers is typically not equal; this leads to differences in the tangential speeds of the rollers, resulting in a less effective grinding process due to the fact that the slip between rollers is not optimal. The higher the differential wear, the faster is the deterioration of the roller diameters and consequently the worse will be the comminution efficiency.
In this presentation, a dynamic load share control for the HPGR rollers is presented, which allows the operators to equalize the wear rate and extend the roller life time. Called RollXtend™
, this solution includes a load share factor which can be parameterized based on the wear measurement performed manually during maintenance procedure. Experiences from a site installation in South America are presented and compared with typical figures from conventional HPGRs without the dynamic load sharing.
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