Electrical conductivity of MO(MO=FeO, NiO)-containing CaO-MgO-SiO2-Al2O3 slag with low basicity

As a fundamental study on recovery of valuable metals from nonferrous metallurgical slags, electrical conductivity values of MO(MO=FeO, NiO)-containing CaO-MgO-SiO2-Al2O3 slag with a low basicity were measured at different temperatures using AC impedance spectroscopy. The result shows that the electrical conductivity increased from 1.4 S/m to 14.4 S/m with the increase of the temperature from 1 573 to 1 773 K and the content of MO which is less than 12% under the constant mass ratio of (CaO+MgO) to (SiO2+Al2O3) of 0.47. Moreover, the increase magnitude of the electrical conductivity was also promoted with the increase of the content of MO. The electrical conductivity of FeO-containing slags was close to that of NiO-containing slags when the content was less than 8%; however, it was obviously larger than that of NiO-containing slags when the content was 12%. The activation energy of the electrical conductivity decreased with the increase of MO content.