### amit 135 lesson 3 particle size distribution mining

across the inlet opening. The particle size that travels from the inlet half width to the wall during the time in the cyclone is col- lected with 50% efficiency. Lapple calculated this particle size, the cut diameter, as Residence time is determined by the number of revolutions (N) the gas stream makes in The mean size of the material passing the 0.15mm screen can be estimated assuming the bottom size is 1 micron. Particle Sizes Distribution Models. There is a common need to determine the amount of material in the feed at a given particle size. The desired particle size may not have been included in the original particle size analysis.