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comminution, material throughput, pressure distribution, modelling


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Tests and Theory

In the 80s and 90s several dissertations on high pressure comminution in a material bed were written at the Institute for Mineral Processing of the Technichal University of Clausthal  (Germany) under the guidance of Professor Klaus Schönert, e.g. Schwechten, D. [2], Müller,  F. [20] and Lubjuhn, U. [25]. Extracts and  results out of some of these publications are shown on this web site, see links on the right side.


Lab-scale High Compression Roller Mill / Institute for Mineral Processing of the TU Clausthal (Germany, 1989)

The results of the comminution behaviour of different materials in the High Compression Roller Mill are part of the Ph.-D.-Thesis of Schwechten, D. [2]. His work shows - beside theoretical thoughts and beside the development of a modelling equation for the stressing in a material bed - a sequence of comminution tests with different materials.

Results of the research on the scientific basics of the high pressure comminution in a material bed, especially on the compression behaviour of the material bed and on the comminution effect in dependence of hardness, particle size, moisture content, stressing velocity and intensity can be found in the Ph.-D.-Thesis of Müller, F. [20].

Test results, approximations and theoretical derivations on throughput and pressure distribution are part of the work of Lubjuhn, U. [25].

It was the objective of this work to find out and characterise the basics of the material transport and the pressure curve in the High Compression Roller Mill. In terms of testing this means:

Determination of the throughput, observation of the particle movement and measuring the pressure distribution in the gap of the High Compression Roller Mill while variating:

  • Material
  • Feed Size
  • Milling Force
  • Circumferential Speed
  • Roller Surface

What was already known and published you will find in the literature overview  throughput and the literature overview pressure distribution.

grinding results for different materials

characteristic of different rollers

Pressure Distribution
pressure diagrams

Press Tests
tests with a molding press

mathematic model of the process

Signs and Symbols

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