Abstract: To improve the activity of iron tailing so as to make it possible to be used in large quality as raw material for cement production, the heat-activation property of iron tailing itself and the effect of red mud on it are studied using the iron tailing of Tong Steel. The results indicate that heat-activation only can not improve the iron tailing activity and it can be notably improved by wet grinding with red mud in a ratio of 1∶1. The test piece of cementation sand made of such iron tailing-red mud mixture (50%) after calcined at 600 ℃ for 2 h can have a 28 d compressive strength of 47.5 MPa, satisfying the requirement of the state standard on 42.5# cement.

Key words: Iron tailing, Red mud, Heat activation, Mixed calcination, Wet grinding