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In this study, the viscometer is used to evaluate the viscosity of slag containing 10% SiO 2 with varying CaO/Al 2 O 3 ratios. When CaO/Al 2 O 3 ratio increases in the 3.00–4.00 range, the viscosity exhibits a non‐monotonic behavior characterized by an initial decrease followed by an increase, with a minimum value of 0.046 Pa·s observed at 1673 K. The slag with a CaO/Al 2 O 3 ratio above 3.00 has relatively low and stable viscosity within the range of 1373–1673 K, which is beneficial for slab quality of high‐aluminum steel. X‐ray diffraction and Raman spectroscopy are used to better understand the viscosity evolution of slag containing 10% SiO 2 . A higher CaO/Al 2 O 3 ratio depolymerizes network structures due to the breaking effect of free oxygen O 2− . Upon surpassing a CaO/Al 2 O 3 ratio of 3.50, the transformation of the crystallization phase occurs from CaO·SiO 2 to 2CaO·SiO 2 . Additionally, a higher CaO/Al 2 O 3 ratio promotes the precipitation of the 11CaO·7Al 2 O 3 ·CaF 2 crystal in the slag.
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Mo et al. (2023) studied this question.
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