2015 Volume 55 Issue 11 Pages 2325-2331
As a fundamental study on properties of the FexO-bearing slags, the total electrical conductivity and electronic/ionic properties of FexO–SiO2–CaO–Al2O3 slags were measured at different oxygen potentials (controlled by CO–CO2 mixture gas) and temperatures by using four-electrode method. From experiments results, it can be seen that the total conductivity changes little as increasing the ratio of CO to CO2 (decreasing the oxygen potential), while the electronic and ionic conductivities of all slags decreases and increases monotonously, respectively. The temperature dependences of the total electrical conductivity, electronic, and ionic conductivities follow the Arrhenius law. It was also found that with increasing CaO/Al2O3 ratio, the total electrical conductivity and ionic conductivity firstly decrease and then increase, while electronic conductivity firstly almost keeps constant but then increases from CaO/Al2O3=1. The minimum values of the total electrical conductivity and ionic conductivity occurs near CaO/Al2O3 = 1, which is mainly resulted from the charge compensation effect of Al3+ ions.