Abstract
To effectively utilize ilmenite and recycle KOH solution, the extraction behaviours of titanium and other associated impurities in the decomposition process of ilmenite by highly concentrated KOH solution were studied. Experiments on the extraction behaviours of titanium as well as other associated impurities of ilmenite such as iron, silicon, calcium, and aluminium were carried out. The effects of various parameters, including reaction temperature, KOH concentration, reaction time, alkali-to-ore mass ratio, and particle size on the extraction rate of titanium and other impurities were examined. When the finely ground ore (58–75 μm) reacted with KOH solution (80wt%) in an alkali-to-ore mass ratio of 7:1 at 260°C for 60 min, almost complete extraction of titanium was achieved, while the extraction rate of aluminium was 78% and that of other impurities was less than 22%. Moreover, high purity (98.2wt%) TiO2 with the anatase structure could be gained in the purification process.
Similar content being viewed by others
References
K. Sun, Mössbauer spectrum study on hydrogen reduction of preoxidized ilmenite, Rare Met., 16(1997), No.1, p.61.
K. Sun, Y.H. Liu, and Y.R. Cui, Oxidation kinetics of ilmenite powder in fluidized bed, Rare Met., 14(1995), No.1, p.26.
Y.M. Wang and Z.F. Yuan, Reductive kinetics of the reaction between a natural ilmenite and carbon, Int. J. Miner. Process., 81(2006), No.3, p.133.
Y.F. Guo, Y.N. Lü, T. Jiang, and G.Z. Qiu, Effect of pre-oxidation on Panzhihua ilmenite in solid state reduction process, J. Univ. Sci. Technol. Beijing (in Chinese), 32(2010), No.4, p.413.
S. Jagasekera, Y. Marinovich, J. Avraamides, and S.I. Bailey, Pressure leaching of reduced ilmenite: electrochemical aspects, Hydrometallurgy, 39(1995), No.1–3, p.183.
S. Zhang and M.J. Nicol, An electrochemical study of the reduction and dissolution of ilmenite in sulfuric acid solutions, Hydrometallurgy, 97(2009), No.3–4, p.146.
B. Liang, C. Li, C.G. Zhang, and Y.K. Zhang, Leaching kinetics of Panzhihua ilmenite in sulfuric acid, Hydrometallurgy, 76(2005), No.3–4, p.173.
M.K. Sarker, A.K.M.B. Rashid, and A.S.W. Kurny, Kinetics of leaching of oxidized and reduced ilmenite in dilute hydrochloric acid solutions, Int. J. Miner. Process., 80(2006), No.2–4, p.223.
N. El-Hazek, T.A. Lasheen, R. El-Sheikh, and S.A. Zaki, Hydrometallurgical criteria for TiO2 leaching from Rosetta ilmenite by hydrochloric acid, Hydrometallurgy, 87(2007), No.1–2, p.45.
J.P. Van Dyk, N.M. Vegter, and P. Chris Pistorius, Kinetics of ilmenite dissolution in hydrochloric acid, Hydrometallurgy, 65(2002), No.1, p.31.
C. Li, B. Liang, and H.Y. Wang, Preparation of synthetic rutile by hydrochloric acid leaching of mechanically activated Panzhihua ilmenite, Hydrometallurgy, 91(2008), No.1–4, p.121.
Y. Liu, T. Qi, J. Chu, Q. Tong, and Y. Zhang, Decomposition of ilmenite by concentrated KOH solution under atmospheric pressure, Int. J. Miner. Process., 81(2006), No.2, p.79.
G.H. Liu, X.B. Li, Q.S. Zhou, and B.Q. He, The structure of silicon and aluminium in strong alkali solution, Light Met., 1998, No.6, p.13.
M. Zarbayani, E. Jorjani, M. Mirmohammadi, M.T. Shadloo, and M. Noaparast, Mineralogical and sink-float studies of Jajarm low-grade bauxite, Int. J. Miner. Metall. Mater., 17(2010), No.3, p.251.
H.M. Zhou, Z.S. Zheng, and Y. Zhang, Kinetic investigations on the leaching of niobium from a low-grade niobium-tantalum ore by concentrated KOH solution, Chin. J. Chem. Eng., 12(2004), No.2, p.202.
Y.B. Wang, T. Qi, J.L. Chu, and W. Zhao, Removal of iron from ilmenite by KOH leaching-oxalate leaching method, Rare Met., 29(2010), No.1, p.9.
Z.N Tang, The Production and Environmental Treatment of Titanium Dioxide, Chemical Industry Press, Beijing, 2000, p.211.
Author information
Authors and Affiliations
Corresponding author
Additional information
This work was financially supported by the National Natural Science Foundation of China (No.50574084) and the Natural Science Research Project of the Education Department of Henan Province, China (No.2010B150014).
Rights and permissions
About this article
Cite this article
Liu, Ym., Lü, H., Qi, T. et al. Extraction behaviours of titanium and other impurities in the decomposition process of ilmenite by highly concentrated KOH solution. Int J Miner Metall Mater 19, 9–14 (2012). https://doi.org/10.1007/s12613-012-0508-3
Received:
Revised:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s12613-012-0508-3