Ferrimagnetic glass-ceramics based on the CMAS system are successfully prepared by melting method, using two hazardous industrial wastes as starting materials. Influences of iron oxide additions on various properties in the slag glass-ceramics have been investigated by using DSC, XRD, STEM, HRTEM, SEM, RUS and VSM. The results indicate that the main crystalline phases of the glass-ceramics are augite and the initial nucleation phases are magnetite. Augite as a major crystalline phase and magnetite as a minor phase are precipitated with high iron oxide content. The comprehensive properties of glass-ceramics show a decreased tread with the gradual increase of the iron oxide content. The experimental data of magnetic hysteresis cycles at room temperature are analyzed with a maximum applied magnetic field of 20 kOe. It can be noted that the variations of hysteresis parameters in the glass-ceramics are largely dependent on content of magnetite phases.

Keywords: Bayan Obo east mine tailing, Glass-ceramics, Augite, Magnetite, Magnetic properties.