期刊
MINERALS ENGINEERING
卷 157, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.mineng.2020.106553
关键词
Red mud; Reduction; Iron concentrate; Phase transformation; Magnetite
资金
- National Key Research and Development Program of China [2018YFC1901902]
- National Natural Science Foundation of China [51904058]
- Open Foundation of State Key Laboratory of Mineral Processing - China Postdoctoral Science Foundation [2020M670783]
- Fundamental Research Funds for the Central Universities [180115008]
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 degrees 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.m(2)/kg and 30.72 x 10(-5) m(3)/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.
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