| Scrap iron is the solid waste of the grinding mechanical treatment of ferrous metal industrial. The comprehensive utilization of iron filings is of important significance. This is not only due to the elimination of environmental pollution, but also the recovery of iron-rich resource in the iron powder. In this paper, scrap iron, the byproduct coupled with machining operation, was used to yield nano oxide and nano nitride powder by electrochemical corrosion mechanism and chemical heat treatment, then the power material was mixed with the macromolecule rubber material under varying proportion to acquire composite material that can be used to absorb microwave.The basic principle of synthesizing iron oxide and iron nitride by scrap iron was discussed. The nanometer magnetic compound oxides were characterized by XRD, SEM and EDS. The microwave absorption property and electromagnetism parameter of scrap iron, iron oxides and iron nitrides were studied in the range of 2～18GHz. The influence of component's content on microwave absorption property was analyzed.The study shows the absorption property of rubber composite material was improved with the quality ratio of iron scurf .When the quality ratio of iron scurf is 33.3% in the rubber and the thickness is 1.8 mm, the absorptive property is about -14.371dB at 11.12GHz in the range of 2~18GHz. The dielectric constant,permeability of composite material have single peak value. When three rubber samples were overlying together in absorption measurement, the maximum absorptive property is about -35. 162dB at 13.36GHz, and the bandwidth is 3GHz.There are two absorber peaks in the range of 2～18GHz.The result shows that the rubber composite material has absorption ability in multi-frequency point.
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