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The viscosity of steel slag has an important influence on phosphorus mass transfer in dephosphorization process and slagging–off after dephosphorization. In current work, the viscosity of steel slag was measured and the influence of BaO on viscosity and structure evolution of steel slag was studied. The results showed that the viscosity of steel slag decreased with the addition of BaO. The Fourier transform infrared spectroscopy (FTIR) analysis showed that the degree of polymerisation (DOP) of steel slag is reduced by the addition of BaO. The Raman spectra quantitative analysis revealed that the convertion of Q 2  and Q 3  to Q 0  and Q 1  was promoted by the addition of BaO. The X–ray photoelectron spectroscopy (XPS) analysis indicated that the general relative fraction quantity of O 0  decreased and that of O 2−  increased with the addition of BaO. The above analysis are agree well with the results of viscosity measurement.

Influence of BaO on viscosity and structure of CaO–SiO 2 –Fe t O–Al 2 O 3 –BaO steel slag