Determination of lifter design, speed and filling effects in AG mills by 3D DEM

Djordjevic, N., Shi, F. N. and Morrison, R. (2004) Determination of lifter design, speed and filling effects in AG mills by 3D DEM. Minerals Engineering, 17 11/12: 1135-1142.


Author Djordjevic, N.
Shi, F. N.
Morrison, R.
Title Determination of lifter design, speed and filling effects in AG mills by 3D DEM
Journal name Minerals Engineering   Check publisher's open access policy
ISSN 0892-6875
Publication date 2004
Sub-type Article (original research)
DOI 10.1016/j.mineng.2004.06.033
Volume 17
Issue 11/12
Start page 1135
End page 1142
Total pages 8
Editor B.A. Wills
Place of publication Oxford, UK.
Publisher Elsevier Ltd.
Collection year 2004
Language eng
Subject C1
290702 Mineral Processing
640300 First Stage Treatment of Ores and Minerals
Abstract The power required to operate large gyratory mills often exceeds 10 MW. Hence, optimisation of the power consumption will have a significant impact on the overall economic performance and environmental impact of the mineral processing plant. In most of the published models of tumbling mills (e.g. [Morrell, S., 1996. Power draw of wet tumbling mills and its relationship to charge dynamics, Part 2: An empirical approach to modelling of mill power draw. Trans. Inst. Mining Metall. (Section C: Mineral Processing Ext. Metall.) 105, C54-C62. Austin, L.G., 1990. A mill power equation for SAG mills. Miner. Metall. Process. 57-62]), the effect of lifter design and its interaction with mill speed and filling are not incorporated. Recent experience suggests that there is an opportunity for improving grinding efficiency by choosing the appropriate combination of these variables. However, it is difficult to experimentally determine the interactions of these variables in a full scale mill. Although some work has recently been published using DEM simulations, it was basically. limited to 2D. The discrete element code, Particle Flow Code 3D (PFC3D), has been used in this work to model the effects of lifter height (525 cm) and mill speed (50-90% of critical) on the power draw and frequency distribution of specific energy (J/kg) of normal impacts in a 5 m diameter autogenous (AG) mill. It was found that the distribution of the impact energy is affected by the number of lifters, lifter height, mill speed and mill filling. Interactions of lifter design, mill speed and mill filling are demonstrated through three dimensional distinct element methods (3D DEM) modelling. The intensity of the induced stresses (shear and normal) on lifters, and hence the lifter wear, is also simulated. (C) 2004 Elsevier Ltd. All rights reserved.
Keyword Engineering, Chemical
Mineralogy
Mining & Mineral Processing
Comminution
Grinding
Modelling
Dem
Power Draw
Tumbling Mills
Ball Mills
Q-Index Code C1

 
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