含MO(MO=FeO,NiO)的低碱度CaO-MgO-Al2O3-SiO2熔渣电导率

摘要

作为有色冶金渣中有价金属回收基础,利用电化学交流阻抗谱法,测定低碱度MO(MO=FeO,NiO)- CaO-MgO-Al2O3-SiO2五元熔渣体系的电导率.结果表明:随着熔渣体系温度的升高和MO浓度的增大,熔渣电导率增大.在1 573～1 773 K下,(CaO+MgO)与(SiO2+Al2O3)质量比为0.47,当MO浓度小于12％时,熔渣电导率为1.4～14.4S/m.随着熔渣中MO浓度的增大,熔渣电导率增大的幅度增加.当熔渣中FeO和NiO浓度小于8％时,两种熔渣的电导率相差不大；当浓度达到12％时,含FeO的熔渣电导率明显大于含NiO的熔渣电导率.随着MO浓度的增加,电导活化能降低.%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-eontaining 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.