动载下磁铁矿石铁硅比对其力学特性及能耗规律的影响  

Influence of Iron-Silicon Ratio of Magnetite Ore on Mechanical Properties and Energy Consumption Under Dynamic Load

作　　者：路燕泽 甘德清 田欣 王庆刚 刘志义 向伟华 王立杰 LU Yanze;GAN Deqing;TIAN Xin;WANG Qinggang;LIU Zhiy;XIANG Weihua;WANG Lijie(Shahe Zhongguan Iron Mine Co.,Ltd.,Hebei Iron and Steel Group,Xingtai,Hebei 054100,China;Hebei Complex Iron Ore Low Carbon Intelligent and Efficient Mining Technology Innovation Center,Xingtai,Hebei 054100,China;College of Mining Engineering,North China University of Science and Technology,Tangshan,Hebei 063210,China;Collaborative Innovation Center of Green Development and Ecological Restoration of Mineral Resources,North China University of Science and Technology,Tangshan,Hebei 063210,China;Hebei Mining Development and Safety Technology Laboratory,North China University of Science and Technology,Tangshan,Hebei 063210,China;Hebei Iron and Steel Group Mining Co.,Ltd.,Tangshan,Hebei 063000,China)

机构地区：[1]河北钢铁集团沙河中关铁矿有限公司,河北邢台市054100 [2]河北省复杂铁矿低碳智能高效开采技术创新中心,河北邢台市054100 [3]华北理工大学矿业工程学院,河北唐山市063210 [4]华北理工大学矿产资源绿色开发与生态修复协同创新中心,河北唐山市063210 [5]华北理工大学河北省矿业开发与安全技术实验室,河北唐山市063210 [6]河北钢铁集团矿业有限公司,河北唐山市063000

出　　处：《矿业研究与开发》2025年第3期148-155,共8页Mining Research and Development

基　　金：河北省博士研究生创新资助项目(CXZZBS2024137)。

摘　　要：为探明磁铁矿石在冲击载荷作用下的破碎特性及能量转换规律,以不同铁硅比的磁铁矿石为研究对象,利用分离式霍普金森压杆对不同铁硅比的磁铁矿石进行冲击破碎试验,分析磁铁矿石在不同入射应力下的破坏变形特性、抗压强度及能量转换规律,并结合扫描电镜技术揭示宏微观破碎机理。结果表明:在冲击载荷的作用下,不同铁硅比的磁铁矿石应力-应变曲线并无压密阶段,弹性模量、峰值应力、动态抗压强度均随着铁硅比的增大而减小,3种铁硅比的磁铁矿石的耗散能随铁硅比及入射应力的增大而增大;随着入射应力的增大,矿石碎块块径不断减小,磁铁矿石内部沿晶裂隙及穿晶裂隙不断增多,裂隙宽度及长度随铁硅比的增大而增加;当入射应力相同时,铁硅比大的矿石碎块比铁硅比小的碎块块径小。因此,在矿山的实际生产中可以将不同铁硅比含量的磁性铁分批次进行破碎,在一定程度上可以提高能量利用率。In order to investigate the crushing properties and energy conversion law of magnetite ore under impact load,taking magnetite ore with different iron-silicon ratios as the research object,the impact crushing test on magnetite ore with different iron-silicon ratios was carried out using split Hopkinson pressure bar to analyze the destructive deformation characteristics,compressive strength and energy conversion law of magnetite ore under different incident stresses,and to reveal the macro-micro crushing mechanism by combining with scanning electron microscope technology.The results show that under the impact load,the stress-strain curves of magnetite ore with different iron-silicon ratios do not have a compression-density phase,and the elasticity modulus,peak stress,and dynamic compressive strength all decrease with the increase of the iron-silicon ratio,and the dissipation energies of the three iron-silicon ratios of magnetite ore increase with the increase of the iron-silicon ratio and the incident energy.With the increase of incident stress,the diameter of the ore fragments is decreasing,the intergranular cracks and transgranular cracks in magnetite ore are increasing,and the width and length of cracks increase with the increase of iron-silicon ratio.When the incident stress is the same,the ore fragments with a large iron-silicon ratio are smaller than those with a small iron-silicon ratio.Therefore,in the actual production of mines,magnetic iron with different iron-silicon ratio can be crushed in batches,which can improve the energy utilisation to a certain extent.

关 键 词：分离式霍普金森压杆 磁铁矿石 铁硅比 力学特性 能量损耗 破碎机理 

分 类 号：TD853[矿业工程—金属矿开采]