Effect of Slag Composition on Desulfurization Ability of High‐Al₂O₃ Refining Slag

The desulfurization ability of refining slag systems has practical significance for the production of iron and steel. In this study, the desulfurization ability ( L S ) of refining slag with high Al 2 O 3 content and the internal relationship between slag composition and L S are investigated based on Raman spectra analysis. The results show that L S increases with w (CaF 2 ), w (CaO)/ w (SiO 2 ) (binary basicity, R 2 ), and w (MgO), and the maximum increment in L S is close to 110% from 29.85 to 61.74, when R 2 increases 50% from 2.0 to 3.0. The reason for the increment in L S is that the intensities of the characteristic peaks of and decrease, and (NBO/T) increases gradually as w (CaF 2 ), R 2 , and w (MgO) increase based on Raman spectra analysis. This indicates that the increase in w (CaF 2 ), R 2 , and w (MgO) promotes the depolymerization of and network structures owing to the increase in O 2− or F − ions in the slag. As w (Al 2 O 3 ) increases, the spectral peak intensity of increases, and (NBO/T) decreases, whereas the amount of basic oxide decreases, thus resulting in fewer O 2− ions and weakened L S .