Abstract High-iron red mud could potentially become a valuable resource if the iron could be extracted efficiently. A novel method for iron recovery from red mud using suspension magnetization roasting (SMR) followed by low-intensity magnetic separation has recently been developed. In this study, the effects of SMR operation parameters on its ability to extract iron from red mud were investigated. Under the optimized conditions, determined to be a roasting temperature of 540 °C, reaction time of 15 min, total gas-flow rate of 500 mL/min, and CO concentration of 30%, an iron grade of 56.41% and iron recovery of 88.45% was achieved. The saturation magnetization and specific magnetic susceptibility of the roasted sample under the optimal conditions studied were 37.17 A·m2/kg and 30.72 × 10−5 m3/kg, respectively. X-ray diffraction, chemical iron phase, and Mossbauer spectroscopy analyses were conducted on the raw and roasted samples, and the results indicate that hematite and goethite phases present in the raw red mud were transformed into magnetite and maghemite during the SMR process.

中文翻译：

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悬浮磁化焙烧高铁赤泥清洁利用

摘要 如果铁能被有效地提取，高铁赤泥有可能成为一种宝贵的资源。最近开发了一种使用悬浮磁化焙烧 (SMR) 和低强度磁选从赤泥中回收铁的新方法。在这项研究中，研究了 SMR 操作参数对其从赤泥中提取铁的能力的影响。在优化条件下，确定焙烧温度540℃，反应时间15min，总气流量500mL/min，CO浓度30%，铁品位56.41%，铁回收率达到了 88.45%。最优条件下焙烧样品的饱和磁化强度和比磁化率分别为37.17 A·m2/kg和30.72×10-5 m3/kg。X射线衍射，化学铁相，