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- Title
XPS Investigation of Magnetization Reduction Behavior and Kinetics of Oolitic Hematite in Gas-Based Roasting.
- Authors
Li, Mengfei; Zhang, Hanquan; Yang, Fan; Chen, Tiejun; Lu, Manman; Yu, Hong
- Abstract
Magnetization reduction roasting is an important method for the utilization of oolitic magnetite. In this study, the magnetization reduction behavior and kinetics of oolitic hematite in gas-based roasting were systematically investigated by X-ray photoelectron spectroscopy (XPS). The results revealed that under optimal roasting conditions of 650 °C, a roasting time of 60 min, and a CO concentration of 30%, the magnetization reduction rate of the roasted product reached 44.34%. Furthermore, the weak magnetic separation concentrate presented a TFe of 58.09% and a concentrate iron recovery of 94.3%. The results of the XPS spectrum indicated that the peak area ratio (Fe2+/Fe3+) gradually increased with an increase in roasting temperature, roasting time, and CO concentration, while over-reduction occurred when the roasting temperature exceeded 750 °C. The investigation of magnetization roasting kinetics for varying particle sizes demonstrated that the magnetization reduction process is controlled by chemical reaction, with a corresponding activation energy range of 42.96 kJ/mol to 63.29 kJ/mol, indicating the particle size has little effect on the magnetization reduction of oolitic hematite.
- Subjects
HEMATITE; ROASTING (Metallurgy); CHEMICAL process control; X-ray photoelectron spectroscopy; MAGNETIZATION; ROASTING (Cooking); GAS condensate reservoirs
- Publication
Minerals (2075-163X), 2024, Vol 14, Issue 5, p462
- ISSN
2075-163X
- Publication type
Article
- DOI
10.3390/min14050462