The tests to analyze grinding material movements in a ring-roller milling system in 1:4 scale have been performed.The thickness of hard coal layer on the mill table has been examined as well as the milling effects depending on the range of the mill parameters,i.e.the table rotary velocity,height of the pile-up ring and coal feed stream.Basing on the determined shapes of the material bulk on the table,average radial velocities of the material could be calculated.Valuable conclusions resulted also from numerical tests of the movement of pulverized material on a rotating table.
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