Abstract：The argon oxygen decarburization (AOD) slag is the by-product in stainless steel smelting by refining method. It has good recyclable and reuse value. However, the AOD slag usually contains heavy metal chromium, which can be released by the leaching effect of rainwater, leading to a threat to ecological environment and human health. Therefore, the mineralogical phase composition of AOD slag was qualitatively analyzed by X-ray diffraction (XRD) and scanning electron microscope-energy dispersive X-ray analysis (SEM/EDX). Then, the main phases in AOD slag were quantitatively analyzed by adiabatic method and K value method. The results showed that the initial phases mainly included γ-dicalcium silicate, cuspidine, merwinite, diopside and wollastonite. The analysis results of adiabatic method indicated that the mass fraction of γ-dicalcium silicate, cuspidine, merwinite, diopside and wollastonite was 41.6%, 16.4%, 17.1%, 14.7% and 10.2%, respectively. Meanwhile, the mass fraction of these five mineral phases obtained by K value method was 44.6%, 14.9%, 13.9%, 10.7% and 8.3%, respectively. The quantitative analysis results of two methods were basically consistent. In addition, the operation of adiabatic method was simple without addition of reference phase, and the precision could meet the requirements of quantitative analysis. It was applicable for the quantitative analysis of mineralogical phase composition in AOD slag.
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