Primary Explosive Processing in the Resonant Acoustic Mixer

Beckel, Eric R.; Oyler, Karl D.; Mehta, Neha; Khatri, Natasha; Marin, John; Shah, Akash; Cordaro-Gioia, Emily; Decker, R. A.; Grau, Henry; Stec, Daniel

doi:10.1002/prep.202100008

Cited by 9 publications

(3 citation statements)

References 5 publications

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“…The vibration curve was consistent with the maximum calculated synthetic vibration velocity of 0.26 cm/s under the field design. With the continuous development of digital mining, the large-scale application of air spacers and digital electronic detonators have made deep hole blasting technology more flexible and diverse [7] . Although there are still lack of detailed research around joints and extensions.…”

Section: Current Status Of Blasting On Fractured Rock Massmentioning

confidence: 99%

Investigation of Rock Joint and Fracture Influence on Delayed Blasting Performance

Zhang¹,

Bai²,

Sun³

et al. 2023

Preprint

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Geological structures such as joints and faults in rock mass have significant influence on open pit mining. Hence, it is critical to develop a understanding of dynamic joint behaviour under blasting loading. This in turn can provide both theoretical and practical guidance to improve blasting rock fragmentation and associated bucket excavating efficiency. In this paper, delayed blasting on the highwall bench at Baiyunebo open-pit mine was used as an example, a nonlinear joint blasting model was also constructed. By simplifying the blasting wave propagation velocity, the P-wave normal incidence to the joint was obtained. The peak vibration velocity was 0.33m/s at 3.0s. The S-wave reflected by the joint interface was first reflected backward and then forward, which the peak vibration velocity was 0.027 m/s. By combining the relevant stress and displacement theories of type I and II cracks, the equipotential diagrams of the stress and displacement field with the vibration velocity of the particle were obtained. σx was positive in the direction of 0~330° and subjected to tensile stress, whereas σy was positive in the direction of 0~180° and under tensile stress. The longitudinal σy along joint was low in compressive stress distribution area and did not affect surrounding rock at the time. The stress concentration appeared in the lower right corner. Based on the continuous behavior of stress wave in joints, the asymmetry and continuous changes reflected in the whole process could not be analysed by the contour diagram. Hence, ANSYS used to analyse distribution of the stress field. The intensity of the shock wave after detonation was greater than that of the rock strength. Subsequently, the sub-layer shock wave supplemented the shock wave energy that was not enough to break the rock and induced further cracking. This was able to be visualized by the degree of color change post-processing. It was concluded that with the attenuation of the detonation wave energy, the stress exhibited a decreasing trend in this process. According to distribution of the peak effective stress, it was found that the peak value first increased to 10-12 MPa and then showed a downward trend. Overall, the results were validated against the finite element simulation and mathematical analysis.

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Section: Current Status Of Blasting On Fractured Rock Massmentioning

confidence: 99%

Investigation of Rock Joint and Fracture Influence on Delayed Blasting Performance

Zhang¹,

Bai²,

Sun³

et al. 2023

Preprint

View full text Add to dashboard Cite

show abstract

“…The vibration curve was consistent with the maximum calculated synthetic vibration velocity of 0.26 cm/s under the field design. With the continuous development of digital mining, the large-scale application of air spacers and digital electronic detonators has made deep-hole blasting technology more flexible and diverse [7]. However, there is still a lack of detailed research on joints and extensions.…”

Section: Current Status Of Blasting On Fractured Rock Massmentioning

confidence: 99%

Investigation of Rock Joint and Fracture Influence on Delayed Blasting Performance

Zhang,

Bai,

Sun

et al. 2023

Applied Sciences

View full text Add to dashboard Cite

Geological structures such as joints and faults in rock mass have a significant influence on open-pit mining. Hence, it is critical to develop an understanding of dynamic joint behavior under blasting loading. This, in turn, can provide both theoretical and practical guidance to improve blasting rock fragmentation and associated bucket excavating efficiency. In this paper, delayed blasting on a highwall bench at an open-pit mine is used as an example; a nonlinear joint blasting model is also constructed. By simplifying the blasting wave propagation velocity and combining the relevant stress and displacement theories of type I and II cracks, equipotential diagrams of the stress and displacement field with the vibration velocity of the particle are obtained. Additionally, ANSYS is used to analyze the distribution of the stress field. This is able to be visualized by the degree of color change post-processing. It is concluded that, with the attenuation of the detonation wave energy, the stress exhibited a decreasing trend in this process. According to the distribution of the peak effective stress, it is found that the peak value first increases to 10–12 MPa and then shows a downward trend.

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“…Viscous material deposited on the blades is also difficult to clean and results in material losses in addition to presenting safety concerns in the case of energetic materials. [73][74][75] Bladeless methods such as dual-axis centrifugal mixers (also called dual asymmetric centrifuge (DAC), rotation revolution, high speed/blade free planetary mixer, planetary centrifugal) and resonant acoustic mixers (RAM) are common for high solids suspensions. In addition to being bladeless, these mixers are easy to clean, allow for the use of different vessels that are sealed (which may help reduce evaporation, provide for safety, etc.…”

Section: Mixing and Sample Preparationmentioning

confidence: 99%

Material extrusion additive manufacturing of dense pastes consisting of macroscopic particles

2022

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Additive manufacturing of dense pastes, those with greater than 50 vol% particles, via material extrusion direct ink write is a promising method to produce customized structures for high-performance materials, such as energetic materials and pharmaceuticals, as well as to enable the use of waste or other locally available particles. However, the high volume fraction and the large sizes of the particles for these applications lead to significant challenges in developing inks and processing methods to prepare quality parts. In this prospective, we analyze challenges in managing particle characteristics, stabilizing the suspensions, mixing the particles and binder, and 3D printing the pastes. Graphical abstract

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Primary Explosive Processing in the Resonant Acoustic Mixer

Cited by 9 publications

References 5 publications

Investigation of Rock Joint and Fracture Influence on Delayed Blasting Performance

Investigation of Rock Joint and Fracture Influence on Delayed Blasting Performance

Investigation of Rock Joint and Fracture Influence on Delayed Blasting Performance

Material extrusion additive manufacturing of dense pastes consisting of macroscopic particles

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