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To investigate the iron oxidization function in CaO-FeOx-SiO2 slag, gas was injecting into molten so as to oxidize it. The variation of the iron valence states with the oxidizing time in different temperature was obtained by chemical analysis method. Microstructure of slag was observed by metallographic microscope and SEM, and phases composition ascertained by EDX and XRD. The regularity of the phases transformation and the oxidizing kinetic equations of the iron were obtained, which provide a theoretical base for compressively utilizing of the slag.