Ca2Fe2O5 is a key precursor in the sintering and reduction process of iron ore fines. Al2O3 can be dissolved into Ca2Fe2O5 to form Ca2(Fe2-xAlx)O5 solid solution. In this paper, the reduction performance of the Ca2(Fe2-xAlx)O5 has been investigated using the thermogravimetric method at 1173K, 1223k, and 1273K respectively with 70%CO-30%N2 gas mixtures . X-ray diffraction is used to characterize the phase change of the sintered samples and the reduced product. The results indicate that reaction rate increases with increasing content of aluminium in solid solution. The reduction process of Ca2(Fe1.6Al0.4)O5 is used to study the migration behavior of the aluminum.The apparent activation energy values of Ca2(Fe2-xAlx)O5 solid solutions (x=0, x=0.1, x=0.2, x=0.3, and x=0.4) are 105.01, 95.30, 83.30, 75.91, and 61.40 kJ·mol-1 respectively.
Keywords: Al2O3; Ca2 (Fe2-xAlx) O5 solid solution; isothermal reduction; XRD