Mineral Compositions and Microstructures of AOD Stainless Steel Slag

Mineral compositions,microscopic morphology and distribution characteristics of AOD stainless steel slag were analyzed by X-ray diffraction,electron microscope and specialized optical microscope respectively.It is suggested that dominant phases in the slag include C₂S,C₃MS₂,augite,and rankinite,and a small amount of spinel,magnetite and little wustite,glass phase,RO phase and calcium ferrite.The volume fraction of C₂S in AOD slag accounts for above 80%,while that of C₃MS₂,augite or rankinite for about 5% each.C₂S and rankinite are black phases under metallurgical microscope.C₂S exists in fine granular aggregation or column with different particle size,and rankinite mainly in anhedron or fine column.C₃MS₂ is found in gray phase,and mainly in anhedron,fine spindle or short column.Augite,spinel and RO are parceled in advantageous phase,and augite is in anhedron with different particle size.