Effect of B2O3 Addition on Electrical Conductivity and Structural Roles of CaO-SiO2-B2O3 Slag

The effect of B2O3 addition on electrical conductivity of CaO-SiO2-B2O3 slag was investigated using the four-electrode method. The slag structure was determined from Raman and nuclear magnetic resonance spectra. The experimental results show that the electrical conductivity, as the B2O3 content in the slag increased from 0 to 10 pct, monotonously increases from 0.0769 to 0.2642 (-1) cm(-1) at temperatures ranging from 1783 to 1873 K (1510 degrees C to 1600 degrees C). The effects of temperature on electrical conductivity obeyed the Arrhenius law, and the electrical conductivity increased as the temperature increased. The Raman spectra results indicated that addition of B2O3 led to an increase of Q(3)(Si) at the cost of Q(2)(Si), which will increase the degree of polymerization of the slag. B-11 nuclear magnetic resonance spectra showed that both BO3 trigonal and BO4 tetrahedral structures increased with the increasing B2O3 content. There was a competitive effect between the presence of these structures and an enhanced degree of polymerization of slags in the networks, which resulted in the increased electrical conductivity of the slag. A structure-electrical conductivity model for CaO-SiO2-B2O3 slag was established