Environmentally sustainable fabrication of high-performance M-type hexaferrite BaFe11.6Mn0.4O19 using manganese residue and rare earths for microwave absorption applications

Manganese residue is a dangerous industrial by-product and has traditionally been stored. Conventional harmless treatment can stabilize Mn2+, but its resource utilization is relatively difficult due to the complex composition of manganese residue. This study proposes a sustainable development approach for synthesizing high-performance M-type ferrite BaFe11.6Mn0.4O19 from manganese residue rich in Fe and Mn for microwave absorption. By optimizing roasting conditions, we controlled oxygen vacancy concentration, enhancing the ferrite’s dielectric and magnetic properties for superior microwave absorption. By simulating the composition of rare earth solid waste, rare earth elements La2O3 and CeO2 were incorporated into ferrite. Further optimize the loss matching mechanism and shielding effect. Characterization techniques confirmed a multiphase-phase M-type ferrite structure with a minimum reflection loss of -33.42 dB. It is clarified that the main reason for the performance improvement mechanism after the incorporation of rare earths is that the formation of new phases and the appearance of solid solutions promote the synergistic effect in polarization and electromagnetic energy dissipation. This method provides a scalable model for industrial waste recycling. This method provides a scalable model for industrial waste recycling.