Effects of MgO and Al₂O₃ on the Formation of Calcium Ferrite

Calcium ferrite as binder phase of high basicity sinter has greatinfluence in the metallurgical properties of sinter. In this paper the influence of MgO and Al₂O₃ on the formation process was studied. According to the precious study on calcium ferrite, different amounts of MgO and Al₂O₃ were added to the fixed ratio raw materials of CaO and Fe₂O₃·X ray diffraction analysis and metallographic microscope was carried out after sintering, to analyze the effects of MgO and Al₂O₃ on the formation of calcium ferrite. When MgO is n the range of 0.5%～2.5%, with the increasing of MgO content, calcium ferrite first increases and then decreases, and reaches the maximum when MgO is between 1.5%～2.0%. When the content of MgO is 2.0%, the ore pahse structure is ideal. Al₂O₃ can promote the solid solution of Fe₂O₃ in calcium ferrite and the formation of liquid phase in two calcium ferrite, so as to promote the transformation of calcium ferrite into silico-ferrite of calcium and aluminum.