Method for predicting the static pressure work index of a high-pressure roller mill based on piston ballast tests
Based on the Bond's third theory of comminution,static pressing specific energy was used as an indicator to evaluate the energy consumption in the crushing of ore materials by high-pressure grinding roller(HPGR).The effects of different applied pressures on the particle size,specific energy consumption,and breakage ratio of ores in piston pressing experiments were investigated,and suitable conditions for different ore piston pressing experiments were determined.The static pressure work index for HPGR of gold ore,magnetite ore,and vanadium-titanium magnetite ore were determined.And the test results were compared with those of the net input power for crushing the same type of ores in actual production with HPGR.The results show that under the conditions of increasing pressure in the piston pressing experiments,the fine particle mass fraction and particle size distribution of the three types of ore increase,and the variation in crushing effect gradually decreases.Under a loading pressure of 80 MPa and a loading rate of 0.2 mm/s,the static pressure work index of HPGR is 1.36 kW·h/t for gold ore,1.44 kW·h/t for magnetite ore,and 1.42 kW·h/t for vanadium-titanium magnetite.The absolute value of relative error between the static pressure work index and the net specific energy consumption in industry practice is within 5.26%.The experimental results can predict the static pressure work index of HPGR and provide a theoretical basis for equipment selection.
high-pressure grinding roller(HPGR)Bond crushing theorypiston press loading experimentstatic pressure work indexprediction model
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