Abstract: Vanadium-containing stone coal is an important vanadium resource in China and oxidized roasting is the foundation for extracting vanadium from stone coal. With a vanadium-containing stone coal from Hu Bei Province as the research target, potentiometric titration, X diffraction, energy spectrum and electron probe are taken to study the change in valence, occurrence and phase transition of vanadium during oxidized roasting process. On this basis, oxidation kinetics of vanadium is studied. The result shows that vanadium in the stone coal mainly occurs in illite; the phase transition in roasting process results in the disappearance of vanadium-containing illite and the formation of soluble vanadate and orthoclase-albite; vanadium oxidation is a staged process(V(Ⅲ)→V(Ⅳ)→V(Ⅴ)); and that its oxidation reaction is controlled by diffusion kinetics whose dynamic apparent activation energy is E =81.19 kJ/mol.

Key words: Stone Coal, Roasting, Vanadium, Valence status, Occurrence state, Oxidation kinetics