Reduction behavior of Fe/Ni in the Fe-Ni-O system

The product composition under different conditions and the reduction behavior of Fe and Ni in the Fe-Ni-0 system were studied by electric resistance furnace experiments and thermogravimetric analysis.The order of difficult degree for reducing Fe/Ni oxides in five systems is NiOFe₂O₃+NiFe₂O₃+NiONiFe₂O₄Fe₂O₃.The existence of Ni can promote the reduction of iron oxides,while the contribution degree depends on its initial state,and the order tends to be metallic NiNiONi released from NiFe₂O₄.As the temperature increases,the reduction products of NiFe₂O₄ are in order of Fe₃O₄,Ni,(Fe,Ni),Fe,and Fe_0.64Ni_0.36.Based on these experimental results,the reduction processes and the kinetics such as activation energy and rate-controlling step for reducing the five oxides were analyzed and discussed.