1. Guo W., Fan Q.M., and Hu C.P., Kinetics of vanadium oxidation during bone coal roasting in air, Rare Met., 1995, 14(4):276.
2. Shlewit H. and Alibrahim M., Extraction of sulfur and vanadium from petroleum coke by means of salt-roasting treatment, Fuel, 2006, 85: 878.
3. Xu G.Z., Ge N.E., Chen J.P., and Shen S.B., Valency study of vanadium in stone coal of southern China, Rare Met., 1990, 9(2): 110.
4. Xu G.Z., Chen B.Z., Li J., Guo X.G., and Yi X.P., Effect of atmosphere composition on transform of vanadium in stone coal of southern China, Rare Met., 1991, 10(3): 198.
5. Liu A.H., Li L.S., and Yu L., Technology of vanadium extraction from V bearing solid wastes and its prospect, Met. Mine (in Chinese), 2003, (10): 61.