Abstract:The red mud of the sub-molten salt process was used as the main raw material, carbon powder and calcium oxide were added to make reduction roasting magnetic separation for iron, and the flow of scandium in the process was discussed. The reduction temperature, reduction time and the dosage of calcium oxide on the reduction effect were examined. The optimal reduction condition was obtained as follows: reduction at 1 000 ℃ for 0.5 h, calcium oxide addition amount was 26%( calcium oxide and red mud mass ratio). Under the condition, the grade of iron concentrate was 62.79%, the recovery of iron was 97.99%, the loss of scandium for flowing into the iron concentration was 13.08%.