“…In order to avoid the difficulties associated with experimental measurements and meet the industrial demands for viscosity data as a function of temperature and composition, several viscosity models have been developed (Urbain, 1987;Iida et al, 2000;Nakamoto et al, 2005;Shu and Zhang, 2006). Recently, attempts have been made to estimate the viscosity of molten slags by using the optical basicity (Shu et al, 2010;Ghosh et al, 2010). Among these, the most commonly applied models were proposed by Seetharaman et al (Sichen et al, 1994;Seetharaman and Sichen, 1994;Seetharaman and Sichen, 1997), Zhang and Jahanshahi (1998a,b) and Kondrative and Jak (2001).…”