The viscosities of CaO‐SiO 2 ‐10wt%MgO‐20wt%Al 2 O 3 ‐Na 2 O slags (CaO/SiO 2 = 0.8–1.2, wt%Na 2 O = 0–10) were measured to estimate the effect of Na 2 O on the viscous behavior at elevated temperatures. The slag viscosity at 1773 K decreased with increasing Na 2 O contents, which is observed in a basic oxide component. However, the FT‐IR spectroscopic analysis of the slag structure seemed to verify that [AlO 4 ]‐tetrahedra depolymerized more readily than [SiO 4 ]‐tetrahedra due to ionic charge compensation which has a tendency to be more effective on [AlO 4 ]‐tetrahedra. Hence, for the present slag system, the viscosity decreased with additions of Na 2 O by providing network breaking O 2‐ ions, and the charge balance by Na + ions independently contributed to the depolymerization of the network structure of the molten slag. In addition, Na 2 O also lowered the critical temperature (T CR ) resulting in a larger temperature difference between the operating temperature (T OP ) and T CR , which can enhance operational stability.
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Kim et al. (2010) studied this question.
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