A model has been developed for drum scrubbing which allows selection of geometry and power input. Specific aspects considered are: Calculation of total static and operating volumes._x000D_
Total residence time based on total operating volume._x000D_
Solids residence time based on solids operating volume._x000D_
Selection of the aspect ratio._x000D_
Alteration of operating fill to allow for smaller or larger feed openings._x000D_
Selection of proportion of critical speed._x000D_
Calculation of shell and motor power requirements.The model uses either solids or total residence time to calculate the required operating volume. The solids residence time is based on the proportion of coarse solids in the feed. Material finer than the reject size is considered as part of the slurry. The solids operating volume is the static volume plus the surcharge on the discharge weir required for flow of the solids from the unit. The total operating volume is the static volume plus the surcharge on the discharge weir for the total flow to exit the scrubber. The burden density is calculated from the coarse solids bulk density and the slurry density that includes all the fine solids. Power is calculated using the Liddell and Moys correlations for burden position and shape, and the operating rotational speed._x000D_
Results from the model (especially power) have been verified from industrial installations of significant size. Predicted and observed power draws are within two per cent. A check against the JKMRC mill model shows power draw prediction agreement to within four per cent._x000D_
FORMAL CITATION:Miller, G, 2004. Drum scrubber design and selection, in Proceedings Metallurgical Plant Design and Operating Strategies 2004, pp 529-540 (The Australasian Institute of Mining and Metallurgy: Melbourne).