Electrical Conductivity of CaO–Al2O3–SiO2 Slags Containing SiC Particles

摘要

Abstract The four-electrode technique was used in this study to examine the effects of SiC particle concentration, CaO/SiO2 mass ratio, and Al2O3 content on the electrical conductivity of heterogeneous CaO–Al2O3–SiO2–SiC slag. It was revealed that the electrical conductivity initially rose and finally decreased with the gradual addition of SiC, reaching a maximum in the slag containing 9 wt% SiC. The appearance of the extreme values can be attributed to the complex changes in the slag structure triggered by the reaction of SiC particles with CaO–Al2O3–SiO2 slag. Furthermore, the electrical conductivity was affected in opposite ways by the Al2O3 content and the CaO/SiO2 mass ratio. When the Al2O3 content increased, the degree of polymerization of the slag increased, resulting in a monotonic drop in the value of electrical conductivity. However, as the CaO/SiO2 mass ratio increased, the degree of polymerization reduced while the concentration of Ca2+ necessary for charge transfer increased, thus showing an ongoing upward trend in electrical conductivity. In the end, the electrical conductivity data were calculated using a series of models and compared with the measured values.Graphical Abstract