doi:10.16186/j.cnki.1673-9787.2022020007

Received:2022/02/08

Revised:2022/05/31

Published:2024/03/25

The characteristics and representation of bond key in bonded particle model for ore crushing

WANG Xiao1，2，XUE Yujun1，2，CHENG Bo3，4，LIU Jun3，4，LI Jishun1，2

1.School of Mechatronics Engineering，Henan University of Science and Technology，Luoyang 471003，Henan，China；2.Henan Key Laboratory for Machinery Design and Transmission System，Henan University of Science and Technology，Luoyang 471003，Henan，China；3.Luoyang Mining Machinery Engineering Design Institute Co.，Ltd.，Luoyang 471003，Henan，China；4.State Key Laboratory of Mining Heavy Equipment CITIC Heavy Industries Co.，Ltd.，Luoyang 471003，Henan，China

Abstract: Objectives Aimed at addressing the inaccuracy of simulation owing to the difference between the ore bonded particle model and the actual ore crushing feature，the characteristics of bond key in the bonded particle model of different size were emphasized. Methods According to the theory of ore strength size effect，the bond parameters between basic particles in the bonded particle model of copper ore were designed.As for three sizes of copper ore samples including 60 mm，40 mm and 30 mm，the drop weight test and crushing simulation by discrete element method were carried out.The concept of equivalent critical deformation of bond was given.The relationship between t10 from drop weight test and impact energy was discussed. The variation rule of bond parameters was explored.  Results The results show that the average errors of mass percentage from crushing simulation and drop weight test of three kinds of size copper ore are 1.75%，1.66% and 1.84%， respectively.The crushing mass percentage obtained by test and simulation are in good agreement.The bond strength can be characterized by normal and shear equivalent critical deformation.The tn10 of unit impact energy from drop weight test can characterize the ore strength. Conclusions The bond parameters are determined by the corresponding relationship between the equivalent critical deformation of the bond and the tn10，which improves the modeling efficiency and simulation accuracy of the ore bonded particle model.

Key words:bonded particle model；bond key；equivalent critical deformation；discrete element method；ore crushing