Is media shape important fro grinding performance in stirred mills?

Sinnott, Matthew D., Cleary, Paul W. and Morrison, Robert D. (2011) Is media shape important fro grinding performance in stirred mills?. Minerals Engineering, 24 2: 138-151. doi:10.1016/j.mineng.2010.10.016

Author Sinnott, Matthew D.
Cleary, Paul W.
Morrison, Robert D.
Title Is media shape important fro grinding performance in stirred mills?
Journal name Minerals Engineering   Check publisher's open access policy
ISSN 0892-6875
Publication date 2011-01
Year available 2010
Sub-type Article (original research)
DOI 10.1016/j.mineng.2010.10.016
Volume 24
Issue 2
Start page 138
End page 151
Total pages 14
Place of publication Oxford, England
Publisher Pergamon Press
Collection year 2011
Language eng
Abstract Models for understanding the basic concepts of fine grinding and how they apply to the design of stirred media mills have not yet matured. While spherical media in tower mills has previously been studied, real grinding media shape in stirred mills can range from spherical (steel/ceramic balls) to highly non-spherical (sand or slag) resulting in very different media and grinding dynamics. Handling the contact mechanics of non-spherical particles is a challenge for numerical models, and very few studies dealing with non-spherical particle shape exist in the literature. Discrete Element Method (DEM) simulations of dry media flow in a pilot-scale tower mill are performed for four cases with different shaped grinding media, in order to understand how flow and energy utilisation within a stirred mill depend on media shape. Differences in media transport, stress distribution, energy dissipation, and liner wear were observed in the tower mill for the spherical and non-spherical cases. A significant departure from sphericity of the media leads to strong dilation of the bed, reduced bulk density, and a reduction in active volume and collisional power levels leading to a reduction in power draw for the mill. In addition, highly non-spherical media tend to pack tightly near the mill walls forming a near solid layer around the inside of the mill shell which results in poorer transport and mixing, as well as increased wear rates on the screw impeller. Grinding performance in stirred mills appears to deteriorate strongly when using highly non-spherical media.
Keyword Discrete Element Method (DEM)
Stirred mills
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Available online 4 December, 2010.

Document type: Journal Article
Sub-type: Article (original research)
Collections: Julius Kruttschnitt Mineral Research Centre Publications
Official 2011 Collection
Version Filter Type
Citation counts: TR Web of Science Citation Count  Cited 7 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 10 times in Scopus Article | Citations
Google Scholar Search Google Scholar
Created: Thu, 27 Jan 2011, 09:51:09 EST by Karen Holtham on behalf of Julius Kruttschnitt Mineral Research Centre