Influence of SiO<sub>2</sub>‐Adding on the Thermophysical Properties and Crystallization Behavior of Ladle Slags
Anton Yehorov, Xingwen Wei, Matheus Roberto Bellé, Olena Volkova
Abstract
The thermophysical properties (viscosity, density, and surface tension) of the secondary metallurgical slags with various CaO/Al 2 O 3 ratios (0.56–1.99) and SiO 2 (1–20 wt%) contents are investigated. The results show that the addition of SiO 2 increases the viscosity of the cleanness and desulfurization slags (CaO/Al 2 O 3 ratios ≥1). In slag with a higher Al 2 O 3 content (CaO/Al 2 O 3 < 1) and constant CaO content, the viscosity shows a first decreased and then increased phenomenon with the addition of SiO 2 . Moreover, the breakpoints of the viscosity are strongly lowered with the addition of SiO 2 . Both the density and surface tension of slags show a decreasing tendency with the SiO 2 addition. Moreover, the single hot thermocouple technique method is applied to investigate the crystallization process of the slags, and the result shows that with high SiO 2 contents, glassy layers are formed on the molten slags.