PRECISE REDUCTION EXPERIMENT STUDY OF BAYER RED MUD

The reduction experiments of Bayer red mud were carried out by using precise reduction method． The indicator of the experiment was the reduction rate of iron oxide． Its impact factors and changing scopes were that the average size of the red mud particles of 1. 24 to 2. 43 m，gaseous reducing agent CO-H2 reduction temperature of 700 ～ 1 000 ℃ and the reduction time of 2 ～ 4 h． The results showed that the effect of the reaction temperature on the reduction rate was significant，and other factors were not; the optimal conditions for the reduction rate were fine grinding red mud particle average size of 1. 236 m， gaseous reducing agent of H2，reduction temperature of 1 000 ℃，and reduction time of 4 h; under the optimal condition，the reduction rate was higher than 99%; during the precise reduction process，no sintering appeared between particles，making it possibile to separate the iron from other elements by physical method; the tailing could be taken as the desulfurization slag for steel after the separation of iron．