磁铁矿矿石组构对微波的响应机制研究  

A study on the response mechanism of composition and structure of magnetite ore to microwave

作　　者：孙琪 李明宇 高文元[1] 赵福德 刘波 黄菲[1,2] SUN Qi;LI Mingyu;GAO Wenyuan;ZHAO Fude;LIU Bo;HUANG Fei(School of Resources and Civil Engineering,Northeastern University,Shenyang Liaoning 110819,China;Liaoning Province Iron Ore Resources Development and Utilization Professional Technology Innovation Center,Fushun Liaoning 113000,China)

机构地区：[1]东北大学资源与土木工程学院,辽宁沈阳110819 [2]辽宁省铁矿资源开发与利用专业技术创新中心,辽宁抚顺113000

出　　处：《矿物学报》2024年第6期870-878,共9页Acta Mineralogica Sinica

基　　金：国家自然科学基金面上项目(编号:42372055);国家自然科学基金资助项目(编号:52071070、51871045);云南省重大科技专项-新材料重大专项(编号:202102AB080008-1);东北大学博士后基金(编号:20190320)。

摘　　要：我国铁矿石品位低、成分复杂、嵌布粒度较细,粉碎矿石过程中需要消耗大量能量,所以亟需提高磁铁矿矿石粉碎效率。本文对Fe_(3)O_(4)分析纯试剂和铁矿石成分分析标准物质的物相结构、静磁性能和电磁特性进行测定,分析讨论了矿石组分含量对其微波吸收性的影响因素以及磁铁矿的微波响应机制。磁铁矿属于强吸波物质,当矿石中磁铁矿的含量越高,其复介电常数和复磁导率越接近Fe_(3)O_(4)分析纯试剂的电磁物理特性。微波能量进入磁铁矿内部后,磁铁矿Fe—O离子键中的电子在电磁场的作用下产生极化作用,形成的偶极子在加速迁移运动中不断碰撞摩擦产生热量,开始吸收并消耗微波场中的电场能量。磁铁矿亚磁晶格中的磁畴也会受到电磁场的作用产生极化作用,从而吸收并消耗微波场中的磁场能量。Because of the low grades,complex compositions and fine particle sizes of iron ores in China,a lot of energy has been consumed in the crushing process of magnetite ore,so it is urgent to improve the crushing efficiency of magnetite ore.In this paper,we have analyzed the phase structures,magnetostatic properties and electromagnetic properties of Fe_(3)O_(4)analytical reagent and iron ore composition analytical reference material,and have discussed the influence factors of magnetite ore composition on its absorption of microwave and the response mechanism of magnetite to microwave.Magnetite is a kind of strong wave-absorbing material.When the content of magnetite in ore is relatively high,the complex permittivity and permeability of magnetite are relatively close to the electromagnetic physical characteristics of analytical pure reagent of Fe_(3)O_(4).After microwave energy entered into magnetite,electrons in the Fe-O ionic bond of magnetite were polarized under the action of electromagnetic field,the heat was generated by the continuous collision and friction of the formed dipoles in the accelerated migration movement,and the electric field energy in the microwave field was absorbed and consumed.Magnetic domains in magnetite sub-magnetic lattices are also polarized due to the function of electromagnetic field,then the magnetic field energy in microwave field was absorbed and consumed.

关 键 词：微波 磁铁矿 磁铁矿矿石 响应机制 微波吸收性 

分 类 号：P574[天文地球—矿物学]