Abstract：The micro-morphology of phases, the chemical component, the quantitative composition of phases, the occurrence state of main elements and the dissemination characteristics of iron-containing phases in steel slag with different alkalinity were analyzed by metallographic microscope, scanning electron microscopy(SEM) and mineral liberation analysis(MLA). The morphology analysis of phases by metallographic microscope and scanning electron microscope showed that four groups of steel slag morphology were mainly composed of square and rounded metallic minerals, the amorphous metallic minerals, the small particle aggregates and long lath-shaped silicate minerals. The phases in these four groups of steel slag mainly included calcium-silicon oxides, calcium-iron oxides and iron-magnesium-calcium solid solution. The occurrence state results of iron and silicon in steel slag with high alkalinity and low alkalinity indicated that two elements existed in carriers including dicalcium silicate, calcium ferrite, RO phase and tricalcium silicate. The determination results of embedded characteristics of iron-containing phases showed that dicalcium silicate, calcium ferrite and RO phase were mutually packaged, forming a complex.
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