石煤循环氧化法提钒焙烧过程氧化机理研究

含钒石煤是我国重要的钒矿资源，氧化焙烧是从石煤提钒的基础。以湖北某地含钒石煤为研究对象，采用电位滴定、Ｘ衍射分析、能谱分析和电子探针分析等手段对氧化焙烧过程中钒的价态和赋存状态变化及相变进行了研究，在此基础上对钒的氧化动力学进行了探讨。研究结果表明：石煤中的钒主要赋存在伊利石中，焙烧过程中相变的结果是含钒伊利石相消失，钾钠长石相和可溶性钒酸盐形成；钒的氧化过程是逐级氧化过程（V(Ⅲ)→V(Ⅳ)→V(Ⅴ)）；钒的氧化反应受扩散动力学控制，其动力学表观活化能为81.19 kJ/mol。

Oxidation Mechanism of Vanadium Extraction in Stone Coal Roasting with Cyclic Oxidation

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.