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Designing mill internals for performance rather than life.

The internal design of grinding mills has a significant influence on the charge trajectory and material transport. This is critical for autogenous grinding (AG) and semi-autogenous grinding (SAG) mills, due to strong dependence of milling performance on feed characteristics and operating parameters. For a mill with identical operating conditions, altered lifter design will change the charge profile and consequently the mechanism of grinding (Powell and Nurick 1996) as well as slurry transport (Cleary and Morrison, 2012). Numerous studies have attempted to quantify the effect of liner configurations on charge dynamics.

Even more challenging is the fact that liner profiles progressively change due to wear, making it very difficult to maintain milling performance over the life of the liner (Powell et al. 2011).

The combination of the current research and expertise in liner wear measurement, grinding optimisation and process modelling with a more rigorous approach to understanding the fundamentals of the interaction of mill internal design with overall mill performance and economics forms the basis to an integrated approach to mill internal management.

For further information please contact Dr Mohsen Yahyaei , Dr Nirmal Weerasekara , or Prof Malcolm Powell .

Click on the link below to view the presentation of the Mill Internals proposal presented by Prof Malcolm Powell, Dr Nirmal Weerasekara & Dr Mohsen Yahyaei on 4th June 2014.