Abstract: In order to investigate the high pressure grinding roll crushing behavior of a magnetite from Cuihongshan，the influences of specific pressure and roll gap on the product size distribution and specific energy consumption were tested.The results showed that：with the increase of roll gap，the uniformity factor of product size increased and reduction ratio dropped；consumption for new generated -8 mm fraction reduced with the increase of roll gap；with the increase of specific pressure，both the uniformity factor of product size and reduction ratio increased；consumption for new generated -8 mm fraction reduced with the increase of specific pressure.Approximate linear relationship exists between consumption and reduction ratio.Specific pressure of high pressure roller has more effect on crushing effect compared with roll gap.Test results can provide technique basis for the determination of high pressure roller mill process equipment parameters.

Key words: High pressure grinding roll, Specific pressure, Roll gap, Reduction ratio, Specific energy consumption