|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Characterization of Minerals, Metals, and Materials
||Phase Transformation of MnO2 and Fe2O3 Briquettes Roasted under CO-CO2 Atmospheres
||Bingbing Liu, Yuanbo Zhang, Zijian Su, Guanghui Li, Tao Jiang
|On-Site Speaker (Planned)
With the depletion of rich manganese ores, high-Fe content manganese ores are becoming the mainstream resources for manganese extraction. Reduction roasting-magnetic separation process is reported as a relatively effective route to realize the separation of manganese and iron. This study investigated the phase transformation of MnO2 and Fe2O3 briquettes (molar ratio 1:1) roasted under various temperatures and CO-CO2 atmospheres. Results showed that when the CO content was in the range of 0-10 vol.%, MnxFe3-xO4 (x=0-1) phase was formed and its content increased with the rising of temperature. The formation of ferromagnetic MnxFe3-xO4 with strong magnetism resulted in an inferior separation of manganese and iron by magnetization roasting-magnetic separation process. With the increase of CO content to over 25 vol.%, the MnxFe3-xO4 content decreased while the content of feebly magnetic substance (MnO)y(FeO)1-y(y=0-1) increased. Further increasing the CO content to over 80 vol.%, (MnO)y(FeO)1-y was reduced to MnO and metallic iron.
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