Morphology of impact fragmentation distribution of single spherical and ellipsoidal particles in drop weight experiments--颗粒学报PARTICUOLOGY

Miao, Q., Huang, P., & Zhu, W. (2024). Morphology of impact fragmentation distribution of single spherical and ellipsoidal particles in drop weight experiments. Particuology, 86, 137-148. https://doi.org/10.1016/j.partic.2023.05.004

Morphology of impact fragmentation distribution of single spherical and ellipsoidal particles in drop weight experiments

Qiuhua Miao, Peng Huang ^*, Wenchang Zhu

School of Mechanical Engineering, Southeast University, Nanjing, 211189, China

10.1016/j.partic.2023.05.004

Volume 86, March 2024, Pages 137-148

Received 22 March 2023, Revised 20 April 2023, Accepted 4 May 2023, Available online 25 May 2023, Version of Record 1 June 2023.

E-mail: huangpeng@seu.edu.cn

Highlights

• Compared with ellipsoids, spherical particles are more difficult to fragment.

• Different peak-shifting characteristics exist during particle fragmentation.

• Maximum continuous fragmentation presents M-shaped characteristic with increased aspect ratio.

• Especially when 0.9 < sphericity <0.95, maximum continuous fragmentation degree peaked.

Abstract

Particle shape is an important factor affecting the fragmentation distribution of the ore particles. To investigate the influence of particle shape on the morphological fragmentation distribution characteristics, the crushable ore particles are defined as prolate, oblate ellipsoid and spherical particles, which have different aspect ratios (AR) and sphericity (S). Based on the drop weight experiment, the influence of the net drop height on the macroscopic mechanical behavior and crushing distribution characteristics of the single spherical and ellipsoidal particles is studied. The results show that different peak-shifting characteristics exist during particle fragmentation. The fragmentation distribution peak shifts left when the increased impact energy is eventually only enough to break medium-sized sub-particles. Conversely, it shifts right when impact energy is increased enough to break largest-sized sub-particles. Besides, regardless of whether the net drop height changes, the maximum continuous fragmentation degree presents “M”-shaped characteristic with the increased AR. Compared with the ellipsoid particles, the single spherical particle is more difficult to be broken by impact, with wider equivalent particle fragmentation distribution. With the increase of particle sphericity, the maximum continuous fragmentation degree of a single ellipsoid particle has an overall trend of initial increase and subsequent decrease. Especially when particle sphericity is 0.9 < S < 0.95, the maximum continuous fragmentation degree of both prolate and oblate ellipsoid particles is much higher.

Graphical abstract

Keywords

Ellipsoid particles; Fragmentation distribution; Drop weight experiment; Numerical simulation

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