2D DEM verification : Load behaviour and forces on a lifter bar

The Discrete Element Method (DEM) is a model that is used to simulate the motion of the media in a grinding mill. The sum of the energy that is lost in inter-media and media-wall collisions represents the power drawn by the mill. The fact that the DEM predicts the power drawn by grinding mills over...

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Bibliographic Details
Published in:Journal of the South African Institute of Mining and Metallurgy 1999-03, Vol.99 (2), p.93-96
Main Author: Van Nierop, M.A., Glover, G., Van Tonder, J.C. & Moys, M.
Format: Article
Language:English
Subjects:
2D DEM verification
DEM simulation
Discrete Element Method (DEM)
energy loss
experimental mill
grinding mills
inter-media collisions
lifter bars
load behaviour
media-wall collisions
mill motion simulation
shell liners
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Summary:The Discrete Element Method (DEM) is a model that is used to simulate the motion of the media in a grinding mill. The sum of the energy that is lost in inter-media and media-wall collisions represents the power drawn by the mill. The fact that the DEM predicts the power drawn by grinding mills over a large range of diameters has been used to show the validity of the DEM. However, the power drawn by a mill is a function only of the sum of forces of the load on the shell liners. A more accurate and detailed validation of the DEM would be to measure these forces as a function of angular position as the liner moves under the load, and to compare these measurements with predictions generated using the DEM. An experimental mill has been developed to reproduce exactly what the 2-dimensional DEM simulates. The 0,55 m diameter mill has a length of 0,023 m, which is fractionally larger than the diameter of the media used in the mill. One of the lifters in the mill has been instrumented so that the forces on the lifter can be measured as the mill rotates. The DEM simulation will be used to predict these forces. This will give experimental evidence of the validity of the DEM for modelling load behaviour in rotating grinding mills.
ISSN:0038-223X