Modelling comminution patterns within a pilot scale AG/SAG mill

Djordjevic, N, Morrison, R, Loveday, B and Cleary, P (2006) Modelling comminution patterns within a pilot scale AG/SAG mill. Minerals Engineering, 19 15: 1505-1516. doi:10.1016/j.mineng.2006.07.003


Author Djordjevic, N
Morrison, R
Loveday, B
Cleary, P
Title Modelling comminution patterns within a pilot scale AG/SAG mill
Journal name Minerals Engineering   Check publisher's open access policy
ISSN 0892-6875
Publication date 2006
Sub-type Article (original research)
DOI 10.1016/j.mineng.2006.07.003
Volume 19
Issue 15
Start page 1505
End page 1516
Total pages 12
Editor B.A. Wills
Place of publication Oxford, UK
Publisher Pergamon - Elsevier Sc. Ltd.
Collection year 2006
Language eng
Subject C1
290702 Mineral Processing
640300 First Stage Treatment of Ores and Minerals
Abstract The patterns of rock comminution within tumbling mills, as well as the nature of forces, are of significant practical importance. Discrete element modelling (DEM) has been used to analyse the pattern of specific energy applied to rock, in terms of spatial distribution within a pilot AG/SAG mill. We also analysed in some detail the nature of the forces, which may result in rock comminution. In order to examine the distribution of energy applied within the mill, the DEM models were compared with measured particle mass losses, in small scale AG and SAG mill experiments. The intensity of contact stresses was estimated using the Hertz theory of elastic contacts. The results indicate that in the case of the AG mill, the highest intensity stresses and strains are likely to occur deep within the charge, and close to the base. This effect is probably more pronounced for large AG mills. In the SAG mill case, the impacts of the steel balls on the surface of the charge are likely to be the most potent. In both cases, the spatial pattern of medium-to-high energy collisions is affected by the rotational speed of the mill. Based on an assumed damage threshold for rock, in terms of specific energy introduced per single collision, the spatial pattern of productive collisions within each charge was estimated and compared with rates of mass loss. We also investigated the nature of the comminution process within AG vs. SAG mill, in order to explain the observed differences in energy utilisation efficiency, between two types of milling. All experiments were performed using a laboratory scale mill of 1.19 m diameter and 0.31 m length, equipped with 14 square section lifters of height 40 mm. (C) 2006 Elsevier Ltd. All rights reserved.
Keyword Engineering, Chemical
Mineralogy
Mining & Mineral Processing
Discrete Element Method
Autogenous And Semi-autogenous Milling
Breakage
Abrasion
Q-Index Code C1

 
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Created: Wed, 15 Aug 2007, 08:06:18 EST