MgO和Al_2O_3含量对铁酸钙生成的影响

Effects of MgO and Al_2O_3 on the Formation of Calcium Ferrite

铁酸钙作为高碱度烧结矿的黏结相,对烧结矿冶金性能的影响极其重要。研究了其生成过程受MgO、Al_2O_3的影响。根据铁酸钙研究基础在CaO、Fe_2O_3固定配比原料中加入不同量的MgO和Al_2O_3,烧结后进行X射线衍射分析,并结合金相显微镜的观察,分析MgO、Al_2O_3的对铁酸钙生成的影响。研究表明:在0.5%～2.5%范围内,随MgO含量的增多,铁酸钙先增多后减少,在1.5%～2.0%取得最大值,且MgO含量为2.0%时,矿相结构较为理想;Al_2O_3可以促进铁酸钙中Fe_2O_3的固溶和二元铁酸钙中的液相生成,从而促进铁酸钙向复合铁酸钙转化。

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.