Thermodynamic analysis of the carbothermic reduction of a high-phosphorus oolitic iron ore by FactSage

Wen Yu¹，Qiong-yao Tang²，Jiang-an Chen¹，Ti-chang Sun³

1. School of Resources and Environmental Engineering, Jiangxi University of Science and Technology2. School of Architectural and Surveying and Mapping Engineering, Jiangxi University of Science and Technology3. School of Civil and Environmental Engineering, University of Science and Technology Beijing

摘 要：A thermodynamic analysis of the carbothermic reduction of high-phosphorus oolitic iron ore（HPOIO） was conducted by the Fact Sage thermochemical software. The effects of temperature, C/O ratio, additive types, and dosages both on the reduction of fluorapatite and the formation of liquid slag were studied. The results show that the minimum thermodynamic reduction temperature of fluorapatite by carbon decreases to about 850°C, which is mainly ascribed to the presence of SiO₂, Al₂O₃, and Fe. The reduction rate of fluorapatite increases and the amount of liquid slag decreases with the rise of C/O ratio. The reduction of fluorapatite is hindered by the addition of CaO and Na₂CO₃, thereby allowing the selective reduction of iron oxides upon controlled C/O ratio. The thermodynamic results obtain in the present work are in good agreement with the experimental results available in the literatures.

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