Influence of impact velocity on fragmentation and the energy efficiency of comminution

Sadrai, S., Meech, J. A., Ghomshei, M., Sassani, F. and Tromans, D. (2006). Influence of impact velocity on fragmentation and the energy efficiency of comminution. In: William P. Schonberg, Hypervelocity Impact: Proceedings of the 2005 Symposium. 2005 Hypervelocity Impact Symposium (HVIS 2005), Lake Tahoe, CA, United States, (723-734). 9–13 October 2005.


Author Sadrai, S.
Meech, J. A.
Ghomshei, M.
Sassani, F.
Tromans, D.
Title of paper Influence of impact velocity on fragmentation and the energy efficiency of comminution
Conference name 2005 Hypervelocity Impact Symposium (HVIS 2005)
Conference location Lake Tahoe, CA, United States
Conference dates 9–13 October 2005
Proceedings title Hypervelocity Impact: Proceedings of the 2005 Symposium   Check publisher's open access policy
Journal name International Journal of Impact Engineering   Check publisher's open access policy
Place of Publication Kidlington, Oxford, United Kingdom
Publisher Pergamon
Publication Year 2006
Sub-type Fully published paper
DOI 10.1016/j.ijimpeng.2006.09.063
ISSN 0734-743X
1879-3509
Editor William P. Schonberg
Volume 33
Issue 1-12
Start page 723
End page 734
Total pages 12
Language eng
Formatted Abstract/Summary Comminution processes such as crushing and grinding are essential stages in mining and mineral processing operations to reduce the size of ore and rock, and to liberate the valuable mineral for beneficiation. Comminution is energy-intensive and responsible for most of the energy used during mineral recovery. Energyefficiency is very low since almost all the energy is dissipated as heat instead of generating new surface area. This paper reports on studies conducted on strain rates achieved by various velocities of impacts that enhance energyefficiency and mineral liberation. The research focuses on understanding comminution fracture mechanics and on quantifying the distribution of energy with respect to generating new surface area. In interpreting breakage energy phenomena, accurate measurements of surface roughness and surface area are essential. A novel approach to measure surface roughness and surface area based on a fractal analysis procedure has been developed. Changes in surface roughness of broken specimens under variable loading rates were studied using a laser probe to generate 3D topographical maps of the fracture surfaces. The results indicate that surface roughness and hence, specific surface area, increase with increasing loading rate by several orders of magnitude as particle size decreases to ∼1 μm. Below this limit, surface roughness begins to diminish from particle–particle attrition. An apparatus to measure the quantitative parameters of impact at different velocities on aggregated rock samples is proposed. Experiments are being carried out at projectile velocities up to 500 m s−1 utilizing a compressed-air device. The results suggest possible efficiency improvements in breakage under the velocity of impact.
Keyword Comminution
Energy efficiency
Impact velocity
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Conference Paper
Collection: Julius Kruttschnitt Mineral Research Centre Publications
 
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Created: Tue, 13 Mar 2012, 11:43:05 EST by Karen Holtham on behalf of Julius Kruttschnitt Mineral Research Centre