Magnetization roasting is an effective method to process limonite ore. However, conventional water quenching technology primarily limits its industrial applications, particularly in regions with water shortages. In this study, the magnetite oxidation mechanism of the air-cooling stage during limonite ore magnetization roasting was investigated in detail. Oxidation roasting experiments of a synthetic magnetite were performed to investigate the effects of the oxidation temperature, oxidation time, and O₂ concentration in the air-cooling stage. The samples were characterized via X-ray diffraction, Mössbauer spectroscopy, simultaneous thermogravimetry and differential scanning calorimetry analysis, and vibrating sample magnetometry. The results showed that magnetite was oxidized to maghemite in a controlled air atmosphere, which was closely related to the oxidation temperature. Additionally, the generation of maghemite did not affect the subsequent magnetic separation owing to its ferrimagnetism. Therefore, as shown in this paper, air cooling is feasible for limonite magnetization roasting.

磁化焙烧是处理褐铁矿的有效方法。然而，传统的水淬技术主要限制了其工业应用，特别是在缺水地区。本研究详细研究了褐铁矿磁化焙烧空冷段磁铁矿氧化机理。对合成磁铁矿进行氧化焙烧实验，研究氧化温度、氧化时间和 O _{2的影响。}空气冷却阶段的浓度。通过 X 射线衍射、穆斯堡尔光谱、同时热重和差示扫描量热分析以及振动样品磁力测定法对样品进行了表征。结果表明，磁铁矿在受控的空气气氛中被氧化成磁赤铁矿，这与氧化温度密切相关。此外，由于磁赤铁矿的亚铁磁性，磁赤铁矿的生成不影响后续的磁选。因此，如本文所示，空冷对褐铁矿磁化焙烧是可行的。