Modelling of incremental rock breakage by impact: For use in DEM models

Morrison, R. D., Shi, F. N. and Whyte, R. (2007) Modelling of incremental rock breakage by impact: For use in DEM models. Minerals Engineering, 20 3: 303-309. doi:10.1016/j.mineng.2006.10.015


Author Morrison, R. D.
Shi, F. N.
Whyte, R.
Title Modelling of incremental rock breakage by impact: For use in DEM models
Journal name Minerals Engineering   Check publisher's open access policy
ISSN 0892-6875
Publication date 2007
Year available 2006
Sub-type Article (original research)
DOI 10.1016/j.mineng.2006.10.015
Volume 20
Issue 3
Start page 303
End page 309
Total pages 9
Editor Wills, B. A.
Place of publication Oxford, UK
Publisher Pergamon-Elsevier Science Ltd.
Collection year 2008
Language eng
Subject C1
290702 Mineral Processing
640300 First Stage Treatment of Ores and Minerals
Abstract DEM simulations of AG and SAG mills indicate that breakage in a single impact is almost certainly a rare event. However, there are many events which might cause some damage. Hence it becomes important to be able to model how damage might accumulate and with what severity a particle is likely to break after accumulating sufficient damage. An investigation of incremental impact breakage of a well characterized ore sample has been carried out by Whyte (2005) [Whyte, R., 2005. Measuring incremental damage in rock breakage by impact. BE (honours) Thesis, The University of Queensland (unpublished)]. The outcomes of this work are encouraging. A modified version of a JKMRC developed equation - which relates severity of breakage to specific energy input - also provides a good description of the degree of incremental breakage for each size range of particles which was tested when breakage does occur. The other factor of interest for a DEM model is the probability of survival after a number of impact events. The work of Vogel and Peukert (2004) [Vogel, L., Peukert, W., 2004. Determination of material properties relevant to grinding by practicable labscale milling tests, International Journal of Minerals Processing, 74S, S329-S338] provides a useful model for multiple impacts with identical energies. This model has been modified and extended to different input energy levels. This model proposes a minimum specific impact energy E-0 below which no damage is accumulated by the body of the particle. Perhaps the most important insight from this work is a way to quantify energy inefficiency of breakage in comminution devices. Each successive impact after the first one fails to utilize E-0 because the particle must be loaded again to E-0 before any further damage can be achieved. For the ore tested, achieving a similar degree of severity of incremental breakage using multiple impacts typically required substantially more total energy than was required for a single impact. However, even very small interactions will still cause some surface damage and generate fine progeny. (C) 2006 Elsevier Ltd. All rights reserved.
Keyword Engineering, Chemical
Mineralogy
Mining & Mineral Processing
comminution
SAG milling
discrete element modelling
Q-Index Code C1
Q-Index Status Confirmed Code

 
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Created: Mon, 03 Mar 2008, 14:25:09 EST by Karen Holtham on behalf of Julius Kruttschnitt Mineral Research Centre