Effect of blast-induced fragment conditioning on impact breakage strength

Parra, H., Onederra, Italo A. and Michaux, S. (2014) Effect of blast-induced fragment conditioning on impact breakage strength. Mining Technology, 123 2: 78-89. doi:10.1179/1743286314Y.0000000059

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Author Parra, H.
Onederra, Italo A.
Michaux, S.
Title Effect of blast-induced fragment conditioning on impact breakage strength
Journal name Mining Technology   Check publisher's open access policy
ISSN 1474-9009
Publication date 2014-06-01
Year available 2014
Sub-type Article (original research)
DOI 10.1179/1743286314Y.0000000059
Volume 123
Issue 2
Start page 78
End page 89
Total pages 12
Place of publication Leeds, W Yorks, United Kingdom
Publisher Maney Publishing
Language eng
Abstract This paper presents the results of controlled blasting experiments and blast modelling carried out to understand and quantify the effect of blasting on the creation of fractures inside fragments referred to as conditioning. Fragment conditioning is studied through the use of indirect and direct measurement techniques on samples collected from different zones around an explosive charge. Modelling is used to map different levels of conditioning throughout the blasted samples and explore the impact of boundary conditions on the spatial distribution of conditioning levels. Combined statistical analysis of repeatable tests showed that the measured impact breakage ranking parameter (A * b) increased by 20 and 33% within the low and intermediate conditioning zones respectively. This translates into a statistically significant strength reduction of the material. These results in conjunction with other documented experience suggest that blast-induced conditioning can have a positive impact on comminution performance and thus energy consumption. Results from this work provide the basis for a methodology to better define post- blast breakage strength inputs into comminution performance models; as well as a preliminary approach to scale up the extent and degree of conditioning by blasting. Further work is required to evaluate the ability to control the degree of conditioning through the application of improvements in designs and novel blasting technology
Keyword Blasting
Blast modelling
Blast conditioning
Fragment conditioning
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 2015 Collection
Sustainable Minerals Institute Publications
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Citation counts: Scopus Citation Count Cited 1 times in Scopus Article | Citations
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Created: Tue, 01 Jul 2014, 19:25:49 EST by Alex Fitzgerald on behalf of School of Mechanical and Mining Engineering