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 Fe3O4 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 Fe3O4.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.
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