Abstract
In order to fill up the deficiency of the theoretical basis about fluoride formation during Bayan Obo iron concentrate roasting process, the thermodynamic conditions of the interactivity between the components of the gangue and calcium fluorite were studied by means of thermodynamic calculation, DTA-TG thermal analysis and XRD characterization. The results revealed that KF, NaF and SiF4 (gaseous) could be formed during the roasting process, and the tendency of the generation of KF is greater than that of NaF or SiF4 in standard state. Besides, the results of roasting experiments showed that the products of KCaCO3F and KCaF3 formed in the temperature range of 800–1250 °C and KF appears when the roasting temperature was higher than 1250 °C in K2O-CaF2 system. For the Na2O-CaF2 system, the product of NaF appears at temperature higher than 1050 °C. The formation reaction of gaseous SiF4 with solid phase CaO • SiO2 in SiO2-CaF2 system took place only at temperature higher than 1150 °C In the natural potash feldspar-CaF2-CaO system, the fluorination reaction products involved KF at temperature higher than 1270 °C, while in the natural aegirine-CaF2-CaO system, NaF formed at temperature higher than 980 °C during roasting process.
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Y. Yang, S. C. Sun, G. F. Tu, X. P. Zhu, W. Jia, Z. Y. Wu, G. Q. Min, Chinese Rare Earths 35 (2014) No. 4, 98–102.
H. Q. Yan, Mining Engineering (in Chinese) 1 (2003) No. 1, 36–40.
X. K. Chen, Science & Technology of Baotou Steel 33 (2007) No. 1, 1–4.
Y. C. Wang, J. L. Zhang, X. L. Song, F. Zhang, G. P. Luo, J. Wang, Chinese Rare Earths 35 (2014) No. 1, 11–15.
L. F. Yang, M. X. Peng, C. Wen, J. M. Huang, J. L. Yu, Jiangxi Science 28 (2010) 641–645.
Y. J. Liang, Y. C. Che, in: S. Q. Feng, Inorganic Thermodynamic Data-Book, Northeastern University Press, Shenyang, 1993, pp. 39–71.
Z. J. Cheng, J. Guo, S. S. Chen, J. Iron Steel Res. Int. 20 (2013) No. 2, 14–20.
S. H. Chen, X. H. Wang, X. F. He, W. J. Wang, M. Jiang, J. Iron Steel Res. Int. 20 (2013) No. 1, 26–33.
Z. Y. Wu, W. Y. Wu, S. C. Sun, X. Bian, G. F. Tu, Chinese Rare Earths 29 (2008) No. 1, 8–12.
Z. Y. Wu, Chemical Behavior of Fluorine in Rare Earth with Fluorine during Roasting Process, Northeastern University, Shenyang, 2008.
J. Y. Wei, Z. Z. Zhang, F. Jiang, G. F. Fan, Y. Chen, J. Tsinghua Univ. (Sci. & Technol.) 50 (2010) 1925–1929.
L. Wang, Bulletin of the Chinese Ceramic Society 27 (2008) 394–397.
H. M. Liang, J. X. Zhao, Z. Q. Zhang, X. M. Li, Y. R. Cui, Special Steel 33 (2012) No. 5, 1–3.
M. Dapiaggi, G. Artioli, C. Righi, R. Carli, J. Non-cryst. Solids 353 (2007) 2852–2860.
Z. Y. Li, Yunnan Metallurgy 39 (2010) No. 5, 73–77.
D. Xie, Study on New Producing Zones of Non-fluorine and Low-fluorine Continuous Casting Mould Fluxes, Chongqing University, Chongqing, 2006.
L. H. Qiu, L. S. Wang, Z. M. Jin, Chemical Journal of Chinese Universities 19 (1998) 345–349.
Y. H. Xue, Z. K. Pan, G. Z. Zhang, Geology of Chemical Minerals 28 (2006) 167–170.
J. Liu, W Z. Yin, Y X. Han, Mining & Metallurgy 16 (2007) No. 4, 17–21.
L. Z. Yang, Component Analysis of Soda Slag and Potassium Feldspar and Comprehensive Utilization, Tianjin University, Tianjin, 2007.
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Foundation Item: Item Sponsored by National Natural Science Foundation of China (51104088); University Science Research Project of Inner Mongolia of China (NJZZ157)
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Zhang, F., An, Sl., Wang, Yc. et al. Thermodynamic Analysis of Formation of Fluoride from Gangue in Bayan Obo Iron Concentrate Containing Fluorite. J. Iron Steel Res. Int. 22, 213–218 (2015). https://doi.org/10.1016/S1006-706X(15)60032-2
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DOI: https://doi.org/10.1016/S1006-706X(15)60032-2