A study of the impact of blast induced conditioning on leaching performance

Parra, Hector, Onederra, Italo, Michaux, Simon, Kuhar, Laura, McFarlane, Angus and Chapman, Nicole (2015) A study of the impact of blast induced conditioning on leaching performance. Minerals Engineering, 74 1-12. doi:10.1016/j.mineng.2014.12.032

Author Parra, Hector
Onederra, Italo
Michaux, Simon
Kuhar, Laura
McFarlane, Angus
Chapman, Nicole
Title A study of the impact of blast induced conditioning on leaching performance
Journal name Minerals Engineering   Check publisher's open access policy
ISSN 0892-6875
Publication date 2015-04
Year available 2015
Sub-type Article (original research)
DOI 10.1016/j.mineng.2014.12.032
Open Access Status
Volume 74
Start page 1
End page 12
Total pages 12
Place of publication Kidlington, Oxford, United Kingdom
Publisher Pergamon Press
Collection year 2016
Language eng
Abstract Recent investigations have alluded to possible improvements of ore extraction efficiency by leaching due to blast induced fragment conditioning. This paper presents results from a series of controlled blasting tests supported by blast modelling and statistical analysis to study the effect of conditioning on copper extraction in laboratory leaching tests. A leachable synthetic material was developed and selected from 19 different preparations. It was possible to control copper grade distributions and provide homogeneous and isotropic characteristics to this material. Combined statistical analysis of four individual controlled blasting tests exhibited no statistical difference in copper extraction between unblasted material and material subjected to a low degree of conditioning. In contrast, the percent copper extraction increased by 0.84% in the intermediate conditioning zones, which translates to an overall improvement in copper extraction efficiency of 39.7%. Leaching tests proved that increasing the blast conditioning does not necessarily improve percent copper extraction. The majority of fractures were generated along grains boundaries and not across the matrix. Therefore, conditioning may not be able to expose a significant amount of copper particles consistently to significantly impact extraction efficiency. In practical terms, the contribution of blast induced conditioning to leaching performance is in the increased probability of exposing mineral species to leaching paths.
Keyword Blasting
Fragment conditioning
Mineral processing
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mechanical & Mining Engineering Publications
Official 2016 Collection
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Created: Wed, 04 Feb 2015, 11:33:33 EST by Rose Clements on behalf of School of Mechanical and Mining Engineering