1. Y.M. Zhang, S.X. Bao, T. Liu, T.J. Chen, and J. Huang, The technology of extracting vanadium from stone coal in China: history, current status and future prospects, Hydrometallurgy, 109(2011), No. 1–2, p. 116.
2. M.Y. Wang and X.W. Wang, Research status and prospect of vanadium leaching processes from stone coal, Chin. J. Rare Met., 34(2010), No. 1, p. 90.
3. X.B. Zhu, Y.M. Zhang, and T. Liu, Experiment and mechanism of vanadium extraction from stone coal by roasting with activators, Chin. J. Rare Met., 37(2013), No. 2, p. 283.
4. H.L. Wu, C. Wei, G. Fan, M.Y. Li, Z.G. Deng, and H.W. Ge, Occurrence of vanadium in high carbon stone-coal and priority of preparation process, J. Kunming Univ. Sci. Technol. Sci. Technol., 33(2008), No. 6, p. 17.
5. R.Y. Xiong and X.L. Zhang, The process of extracting vanadium pentoxide from bone coal and the pollution treatment measures, Environ. Prot. Technol., 16(2010), No. 3, p. 26.