Abstract:

Remelting electroslag，continuous casting mold flux and secondary refining slag were taken as typical steelmaking slag systems. And the volatilization behaviors of each slag system were analyzed by thermogravimetric (TG) and mass spectrometry (MS). The results showed that the remelting electroslag volatilized violently above 1300℃，and the volatiles were mainly CaF₂，MgF₂ with a small amount of SiF₄ and AlF₃. The continuous casting mold flux volatilization was divided into two stages，in the first stage (750—1200℃) CaF₂ reacts with Na₂O and SiO₂ to form NaF and SiF₄, accompanied by the evaporation of a small amount of Na₂O. The second stage (>1300℃) was mainly the CaF₂ evaporation. For CaF₂-CaO based refining slag，the evaporation of CaF₂ was the most intense at the eutectic point (84%CaF₂-16%CaO). This research has guiding significance for the composition and performance control of fluorine-containing slag and metallurgical environmental protection in the steelmaking process.

Key words: Times New Roman", ,", serif", font-size:10.5pt, ">steelmakingfont-size:10.5pt, ">, Times New Roman", ,", serif", font-size:10.5pt, ">fluorine-containing slagfont-size:10.5pt, ">, Times New Roman", ,", serif", font-size:10.5pt, ">volatilizationfont-size:10.5pt, ">, Times New Roman", ,", serif", font-size:10.5pt, ">thermal analysis