The iron tailings of Bayan Obo mines are solid waste, which occupies land area and also causes environmental pollution; however, this waste can be recycled. In this study, based on the characteristics of iron minerals and fluorocarbonate contained in Bayan Obo iron tailings, clean magnetization roasting of iron minerals by bastnaesite from iron tailings during in-situ suspension magnetization roasting in a neutral atmosphere was explored. The results show that for iron tailings with a mass of 12 g, a N₂ gas flow rate of 600 mL/min, and roasting for 5 min at 800 °C, iron concentrate with a 60.44% iron grade at an iron recovery of 76.04% could be obtained. X-ray diffraction analysis showed that the weak magnetic hematite was reduced to strong magnetic magnetite in the neutral atmosphere, without additional reductant. The kinetics of the magnetization roasting of mineral mixtures (bastnaesite and hematite) in a neutral atmosphere showed that the optimal reaction mechanism function was the three-dimensional diffusion model with activation energy of 161.8838 kJ·mol⁻¹; this indicates that the reaction was a heterogeneous, diffusion-controlled solid-state reaction.

白云鄂博铁尾矿为固体废弃物，占用土地面积，也造成环境污染；但是，这些废物可以回收利用。本研究基于白云鄂博铁尾矿中铁矿物和氟碳酸盐的特征，探索了中性气氛原位悬浮磁化焙烧铁尾矿中氟碳铈矿对铁矿物的清洁磁化焙烧。结果表明，对于质量为 12 g 的铁尾矿，N ₂气体流速为 600 mL/min，800 ℃焙烧 5 min，可得到铁品位 60.44%，铁回收率 76.04% 的铁精矿。X射线衍射分析表明，弱磁性赤铁矿在中性大气中被还原为强磁性磁铁矿，无需添加还原剂。中性气氛中混合矿物（氟碳铈矿和赤铁矿）的磁化焙烧动力学表明，最佳反应机理函数为三维扩散模型，活化能为161.8838 kJ·mol ^-1；这表明该反应是一种非均相的、扩散控制的固态反应。