Characterization of the susceptibility of ore particles to breakdown in high voltage pulse breakage and the influencing factors

Abstract

The susceptibility of ore particles to electrical breakdown plays a critical role for high voltage pulse (HVP) breakage, yet its quantitative characterization still lacks deep understanding. Two indicators, namely breakdown delay time (T_d) and breakdown strength (E_b) were compared, based on analysis on the two breakdown modes namely wavefront mode and post-wave mode. It was found that T_d is more suitable to characterize the susceptibility of ore particles to electrical breakdown in HVP breakage than E_b. A probabilistic model based on the Weibull distribution is developed to describe the relation of breakdown probability to T_d. Regression analyses were conducted to investigate how operating parameters and particle properties influence T_d and size reduction degree of ore particles in HVP breakage. The regressed models demonstrate potential capability to predict metallic minerals content and HVP breakage degree based on operating parameters and particle properties.

Keywords

Electrical breakdown / High voltage pulse breakage / Susceptibility / Breakdown delay time

CRediT authorship contribution statement

Rui Sun: Writing - original draft, Data curation. Yang Hong: Investigation, Formal analysis. Daqian Wang: Investigation, For-mal analysis. Liang Si: Supervision, Methodology. Jianguo Yang: Supervisi on, Methodology. Wei Huang: Writing - review & editing. Liefeng Huang: Data curation. Weiran Zuo: Writing - original draft, Project administration, Conceptualization.

Declaration of competing interest

The authors declare that they have no known competing finan-cial interests or personal relations hips that could have appeared to influence the work reported in this paper.

Acknowledgments

The financial supports from National Natural Science Founda-tion of China (Nos. 52574313, 52204272 and 52074091) to this project are gratefully acknowledged.

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