Particle damage and exposure analysis in HPGR crushing of selected copper ores for column leaching

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Publication Type Manuscript
School or College College of Mines & Earth Sciences
Department Metallurgical Engineering
Creator Miller, Jan D.
Other Author Kodali, Phanindra; Dhawan, Nikhil; Depci, Tolga; Lin, C. L.
Title Particle damage and exposure analysis in HPGR crushing of selected copper ores for column leaching
Date 2011-01-01
Description In mining operations, jaw and gyratory crushers are generally used for primary crushing, and cone crushers are used for secondary crushing. During the past decade, however, High-Pressure Grinding Rolls (HPGR) are being considered due to potential processing benefits such as energy savings, improved exposure/liberation and particle weakening. At this time there is no detailed quantification of particle damage and downstream benefits from HPGR crushing are uncertain. In the present research, copper ores (copper oxide ore and copper sulfide ore) were crushed by a jaw crusher and by HPGR and the products were evaluated for particle damage and copper grain exposure by X-ray computed tomography. Column leaching was done to determine the rate and extent of copper recovery. X-ray computed tomography analysis and laboratory column leaching experiments for copper oxide ore revealed that products from HPGR crushing have more particle damage and higher copper recoveries when compared with products of the same size class from jaw crusher crushing. Generally the copper recovery from column leaching of the oxide ore was found to be dependent on the extent of grain exposure, which increases with a decrease in particle size. In the case of the copper sulfide ore, copper recovery was found to be independent of the crushing technique despite the fact that more particle damage was observed in products from HPGR crushing. This unexpected behavior for the copper sulfide ore might be due to the high head grade and strong leach solution. Column leaching results also show that about 80 to 90% of the copper was recovered from the copper sulfide ore in a relatively short leaching time irrespective of crushing technique. As expected, copper recoveries improved with a decrease in the particle size of the copper sulfide ore as exposure of copper mineral grains increased.
Type Text
Publisher Elsevier
Volume 24
Issue 13
First Page 1478
Last Page 1487
DOI http://dx.DOI: 10.1016/j.mineng.2011.07.010
Dissertation Institution University of Utah
Language eng
Bibliographic Citation Kodali, P., Dhawan, N., Depci, T., Lin, C. L., & Miller, J. D. (2011). Particle damage and exposure analysis in HPGR crushing of selected copper ores for column leaching. Minerals Engineering, 24(13), 1478-87.
Rights Management (c) Elsevier; Reprinted from Kodali, P., Dhawan, N., Depci, T., Lin, C. L., & Miller, J. D. (2011). Particle damage and exposure analysis in HPGR crushing of selected copper ores for column leaching. Minerals Engineering, 24(13), 1478-87.
Format Medium application/pdf
Format Extent 1,780,252 bytes
Identifier uspace,17030
ARK ark:/87278/s6rr2gxk
Setname ir_uspace
Date Created 2012-07-26
Date Modified 2021-05-06
ID 707573
Reference URL https://collections.lib.utah.edu/ark:/87278/s6rr2gxk
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