Development of a novel mining explosive formulation to eliminate nitrogen oxide fumes

Araos, Miguel and Onederra, Italo (2014) Development of a novel mining explosive formulation to eliminate nitrogen oxide fumes. Mining Technology, 1-8. doi:10.1179/1743286314Y.0000000074

Author Araos, Miguel
Onederra, Italo
Title Development of a novel mining explosive formulation to eliminate nitrogen oxide fumes
Journal name Mining Technology   Check publisher's open access policy
ISSN 1474-9009
Publication date 2014
Year available 2014
Sub-type Article (original research)
DOI 10.1179/1743286314Y.0000000074
Open Access Status
Start page 1
End page 8
Total pages 8
Place of publication Leeds, W Yorks, United Kingdom
Publisher Maney Publishing
Collection year 2015
Language eng
Formatted abstract
Post-blast nitrogen oxide fumes (NOx) from coal overburden blasting may occur in a variety of geological conditions with the use of bulk ammonium nitrate (AN)-based explosive products. In Australia, government directives to stop blasting activities because of NOx fume incidences have led to costly delays in production, which has directly impacted on the ability of operations to meet production targets. Nitrogen oxide and nitrogen dioxide can cause serious health risks to persons exposed, with excessive levels of NO2 also affecting the viability of flora and root systems. A number of research projects in Australia have focussed on minimising the risk of NOx fumes by better understanding the behaviour of current explosive products. The main outcomes from these projects have been the development and implementation of guidelines or administrative controls to minimise the NOx fume risk and reduce the potential exposure to the hazard. This paper describes preliminary work to provide a step-change solution that has the potential to completely eliminate the NOx hazard. A novel formulation that substitutes the use of AN with oxygenated water (OW) as the main oxidising agent has been developed and recently patented as part of a PhD program at The University of Queensland. The detonation properties of mixtures made with OW and fuel were studied. Unconfined velocities of detonation (VODs) tests of OW sensitised mixtures were conducted. It was found that for reliable detonation to occur, a minimum level of sensitisation must be accomplished. Adequately sensitised mixtures, with a water content of 47% by weight, were able to detonate at velocities in the range of 2600–5000 m s−1, with a critical diameter of the order of 23 mm. The recorded detonation velocities were clearly dependent on the mixture density and charge diameter, similar to the non-ideal behaviour of AN-based commercial explosives.
Keyword Nitrogen oxide fumes
Blasting agent
Explosive formulation
Detonation velocity
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Advance article: Published online 2014

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mechanical & Mining Engineering Publications
Official 2015 Collection
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Citation counts: Scopus Citation Count Cited 0 times in Scopus Article
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Created: Wed, 05 Nov 2014, 16:04:45 EST by Katie Gollschewski on behalf of School of Mechanical and Mining Engineering