The effect of particle breakage mechanisms during regrinding on the subsequent cleaner flotation

Chen, Xumeng, Peng, Yongjun and Bradshaw, Dee (2014) The effect of particle breakage mechanisms during regrinding on the subsequent cleaner flotation. Minerals Engineering, 66 157-164. doi:10.1016/j.mineng.2014.04.020

Author Chen, Xumeng
Peng, Yongjun
Bradshaw, Dee
Title The effect of particle breakage mechanisms during regrinding on the subsequent cleaner flotation
Journal name Minerals Engineering   Check publisher's open access policy
ISSN 0892-6875
Publication date 2014-01-01
Year available 2014
Sub-type Article (original research)
DOI 10.1016/j.mineng.2014.04.020
Open Access Status
Volume 66
Start page 157
End page 164
Total pages 8
Place of publication Kidlington, Oxford, United Kingdom
Publisher Pergamon
Language eng
Subject 2207 Control and Systems Engineering
1600 Chemistry
1909 Geotechnical Engineering and Engineering Geology
2210 Mechanical Engineering
Abstract Stirred mills have been widely used for regrinding, and are acknowledged to be more energy efficient than tumbling mills. These two types of mills present different particle breakage mechanisms during grinding. In this study, the effect of regrinding by both mills on surface properties and subsequent mineral flotation was studied, using chalcocite as the mineral example. A rod mill and a stirred mill with the same stainless steel media were used to regrind rougher flotation concentrates. Different chalcocite flotation recovery was achieved in the cleaner stage after regrinding in tumbling and stirred mills. The factors contributing to the different recovery included particle size, the amount of created fresh surfaces, surface oxidation and the redistribution of collector carried from rougher flotation. All the factors were examined. It was determined that the predominating factor was the different distribution of collector resulting from different particle breakage mechanisms in the stirred and tumbling mills, in line with ToF-SIMS analysis. In the tumbling mill, the impact particle breakage mechanism predominates, causing the collector to remain on the surface of newly produced particles. In the stirred mill, the attrition breakage removes collector from the surface, and decreases particle floatability. Furthermore, the type of grinding media in the stirred mill also influences the subsequent flotation, again due to the change of particle breakage mechanisms. The results of this study demonstrate that the selection of regrinding mills and grinding media should not only depend on the required energy efficiency, but also on the properties of the surfaces produced for subsequent flotation.
Keyword Regrinding
Tumbling mill
Stirred mill
Particle breakage mechanism
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Published online ahead of print 14 May 2014.

Document type: Journal Article
Sub-type: Article (original research)
Collections: Julius Kruttschnitt Mineral Research Centre Publications
School of Chemical Engineering Publications
Official 2015 Collection
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Citation counts: TR Web of Science Citation Count  Cited 7 times in Thomson Reuters Web of Science Article | Citations
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Created: Tue, 27 May 2014, 18:38:34 EST by Karen Holtham on behalf of Julius Kruttschnitt Mineral Research Centre