Abstract: Magnetization roasting technology has become the main mean for efficient development and utilization of refractory iron ore. Cooling mode are important factors affecting the separation results of roasted products. The effect of inert atmosphere cooling， water cooling and air atmosphere cooling mode on the oxidation degree of roasted products magnetite was investigated. The results showed that the inert atmosphere cooling can effectively avoid magnetite being oxidized， and the saturation magnetization is maxmum， it’s 74.2 A?m2/kg. The cooling product in water cooling occurred slight oxidation reaction， and the saturation magnetization can reach to 72.5 A?m2/kg. In air atmosphere， part of magnetite was oxidized into hematite and the saturation magnetization of cooled product is only 37.6 A?m2/kg. In air atmosphere cooling process， the results were greatly influenced by the initial cooling temperature. With the decrease of initial cooling temperature， the FeO content of cooled products gradually increased， the saturation magnetization of the cooled products gradually increased， and the specific susceptibility of the cooled products gradually increased. The experiment results can provide theoretical basis for the process optimum of refractory iron ore magnetic roasting.

Key words: Magnetic roasting, Magnetite, Cooling mode, Oxidation