Detonation Characteristics of a NOx-Free Mining Explosive Based on a Sensitised Mixtures of Low Concentration Hydrogen Peroxide and Fuel

Araos, Miguel; Onederra, Italo

doi:10.22211/cejem/70835

Cited by 8 publications

(6 citation statements)

References 13 publications

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“…The reason for this is that the colloid water reduces the energy loss associated with the upper rarefaction wave. It is generally recognized that detonation failure at the critical thickness is due to the heat released behind the leading shock wave not being sufficient to decompose and ignite the unreacted material to continue sustaining the detonation reaction . Because the colloidal water has a greater wave impedance than air, the rarefaction wave from the upper surface of explosives is weaker.…”

Section: Resultsmentioning

confidence: 99%

Application of Colloid Water Covering on Explosive Welding of AA1060 Foil to Q235 Steel Plate

Yang

Shen

et al. 2019

Propellants Explo Pyrotec

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To make industrial explosives suitable for explosive welding of metal foils, colloid water was used as a covering of explosives. The effect of the colloidal water thickness on the critical thickness of the explosives was investigated, and then AA1060 foil and Q235 steel plate were bonded using this method. Additionally, the bonding properties of the clad plate were studied through mechanical performance tests and microstructure observations. The results show that the colloid water can significantly reduce the consumption of explosives and avoid excess energy in foil weld, due to the low critical thickness of explosives in this condition. The AA1060/Q235 composite sheet shows an excellent bonding quality without macroscopic defects except for the boundary area, and no separation, tearing or fracture was observed under bending load. The microstructure results show a wave‐type metallurgical bonding between the two materials, with some melting zones in the crest. In addition, a hardening phenomenon near the AA1060/Q235 interface was revealed by microhardness and fractography studies on the tensile specimen.

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Section: Resultsmentioning

confidence: 99%

Application of Colloid Water Covering on Explosive Welding of AA1060 Foil to Q235 Steel Plate

Yang

Shen

et al. 2019

Propellants Explo Pyrotec

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“…They key influence on the decomposition of hydrogen peroxide can be attributed to the choice of the auxiliary oxidising agent, as seen clearly by the comparison of the HTP decomposition in OSM 1A with that of virtually any other investigated sample. While a stark difference is seen in that case, significant differences are observed when the cation present in the auxiliary oxidising agent is exchanged (i.e., AN vs. SN vs. PN vs. CN), with OSM formulations utilising calcium nitrate (CN) showing the slowest HTP decomposition and being the only samples that maintain an effective concentration of hydrogen peroxide in excess of 30 wt.%, i.e., the threshold for maintaining the ability to undergo detonation, as indicated in the literature [ 27 ].…”

Section: Discussionmentioning

confidence: 99%

“…Due to the above, more recent works on HTP-based explosives largely include gelling agents in their formulations, granting the materials minor mechanical strength and resistance to spillage while limiting the contact of HTP with potential contaminants [ 25 ]. This modification of HTP-based explosives has attracted greater research interest and such explosives were labelled as “green” explosives [ 26 ], primarily due to the fact that their formulations do not involve any nitrogen compounds and, hence, cannot lead to nitrogen oxide emissions upon detonation [ 27 ].…”

Section: Introductionmentioning

confidence: 99%

Following the Decomposition of Hydrogen Peroxide in On-Site Mixture Explosives: Study of the Effect of the Auxiliary Oxidising Agent and Binder

et al. 2023

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The issues of safety and its impact on both human health and the environment are on-going challenges in the field of explosives (EXs). Consequently, environmentally-friendly EXs have attracted significant interest. Our previous work, dedicated to on-site mixed (OSM) EXs utilising concentrated hydrogen peroxide (HTP) as an oxidising agent, revealed that the gradual decomposition of HTP may be harnessed as an additional safety measure, e.g., protection from theft. The rate of HTP decomposition is dependent on the OSM components, but this dependence is not straightforward. Relevant information about the decomposition of HTP in such complex mixtures is unavailable in literature. Consequently, in this work, we present a more detailed picture of the factors influencing the dynamics of HTP decomposition in EXformulations. The relevant measurement and validation methodology is laid out and the most relevant factors for determining the rate of HTP decomposition are highlighted. Among these, the choice of auxiliary oxidising agent is of particular relevance and it can be seen that the choice to use ammonium nitrate (AN), made in previous works dealing with HTP-based EXs, is sub-optimal in terms of maintaining the stability of HTP. Another important finding is that glass microspheres are not as inert to HTP as would be expected, as replacing them with polymer microspheres significantly slowed the decomposition of HTP in the investigated OSM samples.

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“…Among other potential additives to EEs, the use of concentrated hydrogen peroxide was also investigated, as a possible method of minimising the amount of harmful gases (i.e. carbon monoxide, nitrogen oxides) emitted upon detonation [ 16 , 17 ]. The drawback to this approach is that concentrated hydrogen peroxide is highly reactive, with even traces of contaminants or elevated temperatures inducing its decomposition.…”

Section: Introductionmentioning

confidence: 99%

Novel Sensitizing Agent Formulation for Bulk Emulsion Explosives with Improved Energetic Parameters

et al. 2022

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Bulk emulsion explosives, although they are very convenient and safe to use, also have disadvantages, with the main one being the relatively low power in relation to cartridged emulsion explosives or classic nitroesters (e.g., dynamites). Therefore, materials of this type currently have only limited use. In addition, these materials are characterized by the variability of blasting parameters over time from loading into the blasthole, which is closely dependent on the utilised mining method of the mine, which makes it difficult to precisely control the fragmentation. The industry is trying to respond to the demand for bulk emulsion explosives with increased energy and improved parameter stability, but so far it has not been possible to do so in a safe and effective way. Methods of improving blasting parameters mainly rely on additives to oxidant solutions during production, which creates additional risks at the production stage, as it involves handling hot and concentrated ammonium nitrate solutions, for which there are known cases of uncontrolled decomposition of such solutions, even leading to an explosion. This paper presents a method of improving the thermodynamic parameters and the stability of the sensitization reaction without the need for changes in the oxidant solution.

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Detonation Characteristics of a NOx-Free Mining Explosive Based on a Sensitised Mixtures of Low Concentration Hydrogen Peroxide and Fuel

Cited by 8 publications

References 13 publications

Application of Colloid Water Covering on Explosive Welding of AA1060 Foil to Q235 Steel Plate

Application of Colloid Water Covering on Explosive Welding of AA1060 Foil to Q235 Steel Plate

Following the Decomposition of Hydrogen Peroxide in On-Site Mixture Explosives: Study of the Effect of the Auxiliary Oxidising Agent and Binder

Novel Sensitizing Agent Formulation for Bulk Emulsion Explosives with Improved Energetic Parameters

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