1. Z.Y. Bin, Progress of the research on extraction of vanadium pentoxide from stone coal and the market of the V2O5, Hunan Nonferrous Met., 22(2006), No.1, p.16.
2. M.J. Qi, The status and prospects of vanadium leaching from stone coal, Hydrometall. China, 72(1999), No.4, p.1.
3. C.Y. Luo, The study of new process on the extraction of vanadium from stone coal, Hunan Nonferrous Met., 1995, No.4, p.5.
4. W.C. Dai, Q.J. Zhu. Q.B. Chen, et al., The study of comprehensive utilization of new processes on the extraction of vanadium from stone coal, Nonferrous Met. Miner. Process., 2000, No.3, p.15.
5. Q.Y. Deng and S.Y. Liu, The investigation of new process of roasting with NaCl acid leaching and iron exchange on the extraction of vanadium from stone coal, Rare Met. Hard Alloy, 1993, No.4, p.27.