Characteristics of Dynamic Crushing and Damage Mechanism of Magnetite Ore Under Water Leaching Effect
GAN Deqing1,2,3,4, YU Zehao1,2,3,4, LIU Zhiyi1,2,3,4,*, SUN Haikuan1,2,3,4
1 College of Mining Engineering, North China University of Technology, Tangshan 063210, Hebei, China 2 Collaborative Innovation Center of Green Development and Ecological Restoration of Mineral Resources, Tangshan 063210, Hebei, China 3 Hebei Province Key Laboratory of Mining Development and Security Technology, Tangshan 063210, Hebei, China 4 Hebei Province Green Intelligent Mining Technology Innovation Center, Tangshan 063210, Hebei, China
Abstract: In order to investigate the dynamic damage characteristics and crushing features ofgroundwater-eroded magnetite ore in a water-rich environment, the separate Hopkinson pressure bar (SHPB) test system was used to carry out impact crushing tests on magnetite ore with different submergence durations. The results of the tests with four different strain rates were selected to analyse the mechanical properties and crushing features of magnetite ore under different test parameters, and the factors of strain rate and submergence duration were introduced to establish a statistical damage constitutive model under different strain rate-submergence duration conditions, which was then combined with the damage curve to analyse the damage mechanism of the whole process of submerged magnetite ore. The results showed that the dynamic peak stress, elastic modulus and peak strain of magnetite ore increase with the increase of strain rate. The peak strain, peak stress, and elastic modulus correlated positively, negatively, and negatively, respectively, with water immersion time length. The increase of strain rate and water immersion treatment could lead to a change in the stress drop state of the ore at the post-peak stage. Water immersion treatment resulted in promotion of magnetite ore crushing, increase in the energy absorption per unit volume of ore, reduction in the energy consumption of ore crushing, and improvement of the energy utilisation. The theoretical curves of the modified damage ontology model coincided well with the measured curves in the pre-peak stage, and the established damage curves could characterise the damage mechanism of the whole process of magnetite ore. The damage difference in the pre-peak stage of magnetite ore was dominated by water stress damage. It could be concluded that the water stress damage and loading damage of magnetite ore jointly affect the crushing effect of magnetite ore. The water stress damage can be equivalent to part of the loading damage, and the two conform to a certain proportionality relationship, thereby promoting the ore crushing effect. The results of this study provide useful information for the safe production of water-rich ore bodies and the crushing of magnetite ore.
甘德清, 于泽皞, 刘志义, 孙海宽. 水浸作用下磁铁矿石动态破碎特征及损伤机理[J]. 材料导报, 2025, 39(13): 24060165-10.
GAN Deqing, YU Zehao, LIU Zhiyi, SUN Haikuan. Characteristics of Dynamic Crushing and Damage Mechanism of Magnetite Ore Under Water Leaching Effect. Materials Reports, 2025, 39(13): 24060165-10.
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2025, Vol. 39 
