Abstract
The processes of oxidation of titanium-vanadium slags with the participation of CaO are studied in the temperature range 800–1250°C, and the effect of these processes on the formation of calcium vanadates, which are easily dissolved in weakly acid media, is analyzed. The temperature ranges of the processes related to the oxidation of vanadium-containing phases and the release of vanadium oxides are found. It is shown that anosovite oxides in the temperature range 800–950°C, spinelides oxidize in the range 900–1050°C, and vanadium from the slag phase of calcium aluminotitanate oxidizes at 1050–1250°C. Vanadium-containing perovskite is the most stable phase: it undergoes insignificant structural changes upon roasting. The degree of vanadium extraction from slags reaches 88–92.5% under favorable conditions. The effect of the CaO and FeO contents in a slag on the oxidation of vanadium-containing phases is investigated. A decrease in the FeO content in a slag to 8% or below is shown to negatively affect the oxidation of vanadium in slag phases. At 8.3 or 5.0% FeO in a slag, the maximum degree of vanadium extraction from the slag is 81 or 59%, respectively.
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References
B. Rohrmann, “Vanadium in South Africa,” J. S. Afr. Inst. Min. Metall. 85(5), 141–150 (1985).
L. A. Smirnov, Yu. A. Deryabin, and S. V. Shavrin, Metallurgical Processing of Vanadium-Containing Titanomagnetites (Metallurgiya, Chelyabinsk, 1990).
Yu. A. Deryabin, L. A. Smirnov, and A. A. Deryabin, Prospects of Processing Chineisk Titanomagnetites (Sred.-Ural. Kn. Izd., Yekaterinburg, 1999).
W. Xiqing, Y. Shanyong, and D. Risheng, “The BF practice of smelting V-bearing titano-magnetite at Panzhihua Iron & Steel Co,” in Proceedings of International Symposium on Exploitation and Utilization of Vanadium-Bearing Titanomagnetite, Panzhihua, China (The Metallurgical Industry Press, Beijing, 1989), pp. 63–72.
V. A. Reznichenko, G. B. Sadykhov, and I. A. Karyazin, “Titanomagnetites—raw materials for a new production model,” Izv. Ross. Akad. Nauk, Ser. Met., No. 6, 3–7 (1997).
G. B. Sadykhov, V. A. Reznichenko, I. A. Karyazin, and L. O. Naumova, “Oxidation of vanadium-containing titanium slags,” Izv. Ross. Akad. Nauk, Ser. Met., No. 1, 17–24 (1998).
G. B. Sadykhov and I. A. Karyazin, “Titanium-vanadium slags produced upon the direct reduction of iron from titanomagnetite concentrates,” Russian Metallurgy (Metally), No. 6, 447–454 (2007).
G. B. Sadykhov, “Oxidation of titanium-vanadium slags with the participation of Na2O and its effect on the behavior of vanadium,” Russian Metallurgy (Metally), No. 6, 493–503 (2008).
G. B. Sadykhov, “Development of scientific foundations and technology of complex use of titanomagnetites with a high content of titanium dioxide,” Doctoral (Eng.) Dissertation, Moscow, Baikov Institute of Metallurgy and Materials Science, 2001.
G. B. Sadykhov, K. V. Goncharov, T. V. Olyunina, and T. V. Goncharenko, “Phase composition of the vanadium-containing titanium slags forming upon the reduction smelting of the titanomagnetite concentrate from the Kuranakhsk deposit,” Russian Metallurgy (Metally), No. 7, 583–590 (2010).
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Original Russian Text © G.B. Sadykhov, K.V. Goncharov, T.V. Goncharenko, T.V. Olyunina, 2013, published in Metally, 2013, No. 2, pp. 3–11.
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Sadykhov, G.B., Goncharov, K.V., Goncharenko, T.V. et al. Phase transformations during the oxidation of calcium-containing titanium-vanadium slags and their influence on the formation of calcium vanadates. Russ. Metall. 2013, 161–168 (2013). https://doi.org/10.1134/S0036029513030105
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DOI: https://doi.org/10.1134/S0036029513030105