期刊
MINERALS
卷 12, 期 2, 页码 -出版社
MDPI
DOI: 10.3390/min12020260
关键词
clean utilization; suspension magnetization roasting; limonite ore; phase transformation; magnetism
资金
- National Natural Science Foundation of China [52104249, 51734005, 51874071]
- China Postdoctoral Science Foundation [2021M700726]
This study developed a suspension magnetization roasting technology to recover refractory limonite ore. The optimal roasting conditions were determined, and the transformation of hematite and goethite into magnetite during the roasting process was observed. The magnetism of the roasted products significantly improved, indicating the effectiveness of the magnetization roasting technology.
As a typical refractory iron ore, the utilization of limonite ore with conventional mineral processing methods has great limitations. In this study, suspension magnetization roasting technology was developed and utilized to recover limonite ore. The influences of roasting temperature, roasting time, and reducing gas concentration on the magnetization roasting process were investigated. The optimal roasting conditions were determined to be a roasting temperature of 480 degrees C, a roasting time of 12.5 min, and a reducing gas concentration of 20%. Under optimal conditions, an iron concentrate grade of 60.12% and iron recovery of 91.96% was obtained. The phase transformation, magnetism variation, and microstructure evolution behavior were systematically analyzed by X-ray diffraction, vibrating sample magnetometer, and scanning electron microscope. The results indicated that hematite and goethite were eventually transformed into magnetite during the magnetization roasting process. Moreover, the magnetism of roasted products significantly improved due to the formation of ferrimagnetic magnetite in magnetization roasting. This study has implications for the utilization of limonite ore using suspension magnetization roasting technology.
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