Abstract: To utilize the red mud from Bayer process of alumina plant，to add combined addictives，and to adopt the microwave technique by adding carbon black-based direction reduction roasting to separate iron from slag effectively.The composition of the iron and the slag phase separating from the red mud were analyzed by means of XRD，SEM，and EDS etc..Results showed that iron phase was separated from slag effectively with the Fe mass fraction to a reduction of 77.37%.Finally the theory of the compound additives mixed in the red mud which had reduced temperature of the solid-phase reaction from the angle of thermodynamics was discussed.The study will provide a new method for comprehensive utilization of aluminum industrial waste in the future.

Key words: red mud, microwave reduction, addictive, reaction condition