Abstract：The X-ray diffraction spectrum of mill scale with different sizes was investigated. The results showed that, the diffraction peak intensity was the strongest for the mill scale with particle size of 270-400 mesh. The X-ray diffraction spectrum of mill scale was treated by analysis and evaluation program, and the results were compared with data in PDF-2 database (International Centre for Diffraction Data) to find out the characteristic phases. It was found that the characteristic phases of mill scale were coexisting ferric oxide, magnetic iron oxide and ferrous oxide while the content of other impurity phases was very low. Based on the comparison with characteristic phases of natural iron ore, it was found that, the ferrous oxide phase was the main characteristic to differentiate mill scale from iron ore. Therefore, the presence of ferrous oxide phase could be considered as an important index to identify whether mill scale was doped in iron ore. Based on this, an identification method of mill scale in iron ore was established by X-ray diffraction method. This method could be applied to the identification of mill scale with content higher than 10%.
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