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In recent years, the application of far-infrared ceramics in fuel activation, medical care, and stealth materials has attracted an increasing amount of attention. This article proposes an analytical method to determine ceramic formulation based on the chemical composition of tailings, in which the weight ratio of the iron ore tailings, calcium carbonate, and silica is 6:1:1. On this basis, 3 wt%, 5 wt%, 7 wt%, 9 wt%, and 11 wt% schorl was added to improve the far-infrared radiation performance of iron-tailing ceramics. The results showed that the far-infrared emissivity of iron-tailing ceramics was 0.887, this being lower than that of the experimental group, and the maximum value was 0.925 when 5 wt% schorl was added. The best far-infrared radiation performance obtained is summarized as being the isomorphic structure formed by substituting metal ions that changes the dipole moment between the molecules and reduces the symmetry of the crystal vibration.

In this study, rare earth/schorl composites were prepared using co-precipitation technique with Xinjiang schorl and cerium nitrate as raw materials. The phase transitions and the lattice parameters were investigated simultaneously during the heat treatment process utilizing a high temperature X-ray diffraction. The microstructures of the composites treated at 800, 850, 900 and 950 °C were characterized by scanning electron microscope, transmission electron microscope and high resolution transmission electron microscope. The results clearly indicate that the cerium ions exchanged the interfacial structure of schorl particles, which led to the reduction in phase transition temperature. The interfacial migration and mass transfer were promoted during the phase transformation, rendering a better transformation of mullite crystals from schorl.