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Journal of the Southern African Institute of Mining and Metallurgy

On-line version ISSN 2411-9717
Print version ISSN 0038-223X

J. S. Afr. Inst. Min. Metall. vol.111 n.2 Johannesburg  2011




Total primary milling cost reduction by improved liner design



J. DahnerI; A. Van den BoschII

IMagotteaux (Pty) Ltd, South Africa
IIMagotteaux SA, Belgium




Total milling cost is composed of energy, liner and grinding media costs.
In primary high ball load milling, the grinding media play the biggest role in total milling cost. This cost can be drastically reduced by improving the impact condition inside the mill. The impact condition inside the mill is influenced by shell liner design (as well as feed end and discharge design) and the type of discharge. The improvement of the impact condition will result in a significant decrease in grinding media consumption. The softened impact condition allows for better alloy optimization, resulting in a further reduction in grinding media consumption.
Optimized liner design can also improve energy consumption as less energy is wasted in the projection of the grinding media. Magotteaux utilizes tools to simulate and show the grinding media trajectories for shell and end liners.
This paper will present some practical examples where the media and energy consumption can be or has been reduced by optimizing liner design.

Keywords: Comminution, grinding, liner design, grinding media wear



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