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The normal stress on the roller surface
of high-pressure grinding rolls during
individual particle / interparticle comminution
Prof. Dr.-Ing. G. Unland, Dipl.-Ing. J. Kleeberg, TU Bergakademie Freiberg, Institut für Aufbereitungsmaschinen, Freiberg, Germany
Damage to the roller surfaces has a detrimental effect on the operation of high-pressure grinding rolls. This damage is caused by, among other things, high normal loads. If the rollers are fed with fines together with particle sizes that correspond approximately to the size of the grinding gap, e.g. during finished or combined grinding, a ”quasi-hydrostatic“ state is formed around the coarse individual particles. This supports these particles during the comminution and the requisite comminution forces are increased. This higher load on the roller surface can reach local values that are 3.5 times the average pressure acting on the particle bed. The following article describes the results of investigations that were achieved during the application of load to a cement clinker in a compression testing unit.
Summary CEMENT INTERNATIONAL 05/2004 pp 54-65
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