2017 Volume 57 Issue 12 Pages 2091-2096
The present study investigated the influences of Na2O and K2O on the electrical conductivity of CaO-SiO2-(Al2O3) melts by the four electrode method. From the experimental results, it was found that the temperature dependence of electrical conductivity obeys the Arrhenius law. As adding Na2O or K2O to CaO-SiO2-(K2O) melts, electrical conductivity monotonously decreases. Meanwhile, Na2O bearing melt always has a larger value of electrical conductivity than K2O bearing melt when the compositions are the same. By substituting K2O for Na2O, the mixed alkali effect occurs that electrical conductivity first decreases and then increases with the substitution amount of K2O. Furthermore, the mixed alkali effect is more evident for melts with Al2O3 than that without Al2O3.