Because the formation behavior of primary slag which decomposed from complex calcium ferrite (SFCA-I and SFCA) is not quite clear, the migration behavior of CaO and Al₂O₃ derived from high basicity or high alumina sinter is always worth studying. The reducibility of three representative sinter samples and the formation behavior of primary slag during reduction process were investigated via X-ray diffraction, scanning electron microscopy, and energy-dispersive spectroscopy characterization. The results show that the reducibility of high basicity sinter is superior to that of high alumina sinter. Minerals with poor reducibility like hercynite and brownmillerite and with large-grained particles like free alumina and silica form in sinters with basicity of 2.4 and Al₂O₃ content of 4 wt.%, respectively. The appearance of these minerals can well explain the reduction stagnation phenomenon occurring in these sinter samples. The migration behavior of CaO and Al₂O₃ during slag formation process is different. CaO can easily combine with SiO₂ to form silicate phase or firstly form calcium-rich ferro-aluminate solid solution and then transform to silicate phase, while Al₂O₃ firstly combines with CaO and FeO to form solid solution and then, gradually combines with SiO₂ to form calcium aluminum silicate phase.

由于复合铁酸钙（SFCA-I和SFCA）分解的初生熔渣的形成行为尚不十分清楚，因此高碱度或高铝烧结矿中CaO和Al ₂ O _{3的迁移行为一直值得研究。}通过 X 射线衍射、扫描电子显微镜和能量色散光谱表征研究了三种代表性烧结矿样品的还原性和还原过程中初级渣的形成行为。结果表明，高碱度烧结矿的还原性优于高铝烧结矿。_{在碱度为 2.4 和 Al 2}的烧结矿中形成了具有较差还原性的矿物，例如水铝石和褐煤，以及具有大晶粒颗粒（例如游离氧化铝和二氧化硅）O ₃含量分别为4 wt.%。这些矿物的出现可以很好地解释这些烧结矿样品中出现的还原停滞现象。_{CaO和Al 2} O ₃在造渣过程中的迁移行为不同。CaO很容易与SiO ₂结合形成硅酸盐相或先形成富钙的铝酸铁固溶体再转变为硅酸盐相，而Al ₂ O ₃先与CaO和FeO结合形成固溶体，然后逐渐与SiO ₂形成硅酸铝钙相。