Abstract: An approach of gasbased prereduction was introduced to treat a highaluminium content iron ore with total iron of 3082% (mass fraction) and Al2O3 of 2332% for AlFe separation. The results showed that the maximum reduction rate of 1# pellets reached 7713% by reduction for 77 minutes in the reduction atmosphere of 70%CO and 30%H2 in volume fraction at 900℃. The maximum reduction rate of 2# pellets reached 822% by reduction for 80 minutes with 70%CO and 30%H2 in volume fraction at 950℃. The maximum reduction rates achieved for 2# pellets at the temperatures above 900℃ were very close， so the optimal prereduction temperature of two kinds of pellets was 900℃ by taking all the factors into consideration. The additive of slaked lime undermined the existential relationship among ferreous， aluminiferous and silaceous minerals. Xray diffraction results indicated that the phases Fe2SiO4 and FeAl2O4 which were difficult to deoxidize appeared in the process of reduction and made the reduction process difficult to carry on.

Key words: Highaluminum content iron ore, gasbased prereduction, reduction rate, AlFe separation, Xray diffraction