Energy efficient comminution under high velocity impact fragmentation

Sadrai, Sepehr, Meech, John A., Tromans, Desmond and Sassani, Farrokh (2011) Energy efficient comminution under high velocity impact fragmentation. Minerals Engineering, 24 10: 1053-1061. doi:10.1016/j.mineng.2011.05.006

Author Sadrai, Sepehr
Meech, John A.
Tromans, Desmond
Sassani, Farrokh
Title Energy efficient comminution under high velocity impact fragmentation
Language of Title eng
Journal name Minerals Engineering   Check publisher's open access policy
Language of Journal Name eng
ISSN 0892-6875
Publication date 2011-08-01
Sub-type Article (original research)
DOI 10.1016/j.mineng.2011.05.006
Open Access Status Not yet assessed
Volume 24
Issue 10
Start page 1053
End page 1061
Total pages 9
Place of publication Kidlington, United Kingdom
Publisher Pergamon
Language eng
Formatted abstract
In mining operations, comminution processes are responsible for most of the energy used during mineral recovery. Low fragmentation efficiency of comminution in the range of 1–2% (Tromans, 2008) occurs due to the quasi-static nature of the process which is typically accompanied by low impact velocities. Accurate estimation of efficiency requires a measurement system to account for fractal parameters such as surface roughness and fracture surface area. Continuum breakage models of single particles fail to estimate the actual stress transformation that affects bulk material during comminution. In order to study comminution in a dynamic regime at higher strain rates than those of conventional equipment, a compressed-air apparatus designed to launch a projectile at velocities as high as 450 m s-1 has been developed to measure the quantitative nature of high-speed impacts on aggregated rock samples. A method to calculate the energy efficiency is also presented. The results of experiments conducted on three materials suggest the energy efficiency of rock breakage can be improved by two or three times under high velocity impact for the same energy input level. The paper reports an empirical model of impact velocity and energy input and discusses the advantages and limitations of this model.
Keyword Mining
Mineral Processing
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Julius Kruttschnitt Mineral Research Centre Publications
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Citation counts: TR Web of Science Citation Count  Cited 8 times in Thomson Reuters Web of Science Article | Citations
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Created: Tue, 13 Mar 2012, 21:37:13 EST by Karen Holtham on behalf of Julius Kruttschnitt Mineral Research Centre