Abstract
A thermodynamic analysis of the carbothermic reduction of high-phosphorus oolitic iron ore (HPOIO) was conducted by the FactSage 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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References
J.B. Maynardand and F.B. Van Houten, Descriptive model of oolitic ironstones, Developments in Mineral Deposit Modeling, Edited by J.D. Bliss, U.S. Geological Survey Bulletin, Washington, 2004, p. 39.
Y.M. Zhao and C.S. Bi, Time–space distribution and evolution of the Ningxiang type sedimentary iron deposits, Miner. Deposits, 19(2000), No. 4, p. 350.
W. Yu, T.C. Sun, J. Kou, Y.X. Wei, C.Y. Xu, and Z.Z. Liu, The function of Ca(OH)2 and Na2CO3 as additive on the reduction of high-phosphorus oolitic hematite–coal mixed pellets, ISIJ Int., 53(2013), No. 3, p. 427.
G.H. Li, S.H. Zhang, M.J. Rao, Y.B. Zhang, and T. Jiang, Effects of sodium salts on reduction roasting and Fe–P separation of high-phosphorus oolitic hematite ore, Int. J. Miner. Process., 124(2013), p. 26.
Y.L. Li, T.C. Sun, J. Kou, Q. Guo, and C.Y. Xu, Study on phosphorus removal of high-phosphorus oolitic hematite by coal-based direct reduction and magnetic separation, Miner. Process. Extr. Metall. Rev., 35(2014), No. 1, p. 66.
D.W. Yang, T.C. Sun, H.F. Yang, C.Y. Xu, C.Y. Qi, and Z.X. Li, Dephosphorization mechanism in a roasting process for direct reduction of high-phosphorus oolitic hematite in west Hubei Province, China, J. Univ. Sci. Technol. Beijing, 32(2010), No. 8, p. 968.
J.C. Zhou, Z.L. Xue, H.F. Zhang, and Z.Q. Li, Study on phosphorus removal technology of high-phosphorus oolitic hematite, Ironmaking, 26(2007), No. 2, p. 40.
W. Yu, T.C. Sun, Q. Cui, C.Y. Xu, and J. Kou, Effect of coal type on the reduction and magnetic separation of a high-phosphorus oolitic hematite ore, ISIJ Int., 55(2015), No. 3, p. 536.
H. Han, D. Duan, P. Yuan, and S. Chen, Recovery of metallic iron from high phosphorus oolitic hematite by carbothermic reduction and magnetic separation, Ironmaking Steelmaking, 42(2015), No. 7, p. 542.
S.J. Bai, S.M. Wen, D.W. Liu, W.B. Zhang, and Q.B. Cao, Beneficiation of high phosphorus limonite ore by sodium- carbonate-added carbothermic reduction, ISIJ Int., 52(2012), No. 10, p. 1757.
H.L. Han, D.P. Duan, X. Wang, and S.M. Chen, Innovative method for separating phosphorus and iron from high-phosphorus oolitic hematite by iron nugget process, Metall. Mater. Trans. B, 45(2014), No. 5, p. 1634.
Y.L. Li, T.C. Sun, C.Y. Xu, and Z.H. Liu, New dephosphorizing agent for phosphorus removal from high-phosphorus oolitic hematite ore in direct reduction roasting, J. Cent. South Univ. Sci. Technol., 43(2012), No. 3, p. 827.
G.H. Li, M.J. Rao, C.Z. Ouyang, S.H. Zhang, Z.W. Peng, and T. Jiang, Distribution characteristics of phosphorus in the metallic iron during solid-state reductive roasting of oolitic hematite ore, ISIJ Int., 55(2015), No. 11, p. 1.
C.W. Bale, E. Bélisle, P. Chartrand, S.A. Decterov, G. Eriksson, K. Hack, I.H. Jung, Y.B. Kang, J. Melançon, A.D. Pelton, C. Robelin, and S. Petersen, FactSage thermochemical software and databases-recent developments, Calphad, 33(2009), No. 2, p. 295.
J. Mu, F. Leder, W.C. Park, R.A. Hard, J. Megy, and H. Reiss, Reduction of phosphate ores by carbon: Part I. Process variables for design of rotary kiln system, Metall. Trans. B, 17(1986), No. 4, p. 861.
C.R. Borra, S. Dwarapudi, G. Kapure, V. Tathavadkar, and M.B. Denys, Effect of alumina on slag–metal separation during iron nugget formation from high alumina Indian iron ore fines, Ironmaking Steelmaking, 40(2013), No. 6, p. 443.
Y.L. Li, T.C. Sun, A.H. Zou, and C.Y. Xu, Effect of coal levels during direct reduction roasting of high phosphorus oolitic hematite ore in a tunnel kiln, Int. J. Min. Sci. Technol., 22(2012), No. 3, p. 323.
Y.S. Sun, Y.X, Han, P. Gao, Z.H. Wang, and D.Z. Ren, Recovery of iron from high phosphorus oolitic iron ore using coal-based reduction followed by magnetic separation, Int. J. Miner. Metall. Mater., 20(2013), No. 5, p. 411.
S.J. Bai, S.M. Wen, D.W. Liu, W.B. Zhang, and Y.J. Xian, Catalyzing carbothermic reduction of siderite ore with high content of phosphorus by adding sodium carbonate, ISIJ Int., 51(2011), No. 10, p. 1601.
J.S.J. Van Deventer and P.R. Visser, On the role of the Boudouard reaction in the isothermal reduction of iron ore by char and graphite, Thermochim. Acta, 111(1987), p. 89.
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Yu, W., Tang, Qy., Chen, Ja. et al. Thermodynamic analysis of the carbothermic reduction of a high-phosphorus oolitic iron ore by FactSage. Int J Miner Metall Mater 23, 1126–1132 (2016). https://doi.org/10.1007/s12613-016-1331-z
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DOI: https://doi.org/10.1007/s12613-016-1331-z