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slags was greater than that of Na 2 O. This could be due to the different ways in which these additives modify the slag network structure. Raman spectroscopy analysis revealed that MgO and Na 2 O work as network modifiers, and the degree of polymerization (DOP) of slags increases with the addition of MgO and Na 2 O. MgO is more effective at modifying the structure than Na 2 O, because Na 2 O may be more likely to produce network former [AlO 4 ] units. In this study, Cr 2 O 3 and B 2 O 3 are found to behave as network formers and increase the DOP. This is characterized by the decrease in NBO/Si (the number of non-bridging oxygen per Si atom) value. B 2 O 3 addition leads to the formation of low melting point eutectics and weaker polymerization strength, which contribute to the decrease in slag viscosity.

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