Abstract：The vanadium slag was roasted in muffle furnace to produce clinkers with different temperature stages. The vanadium slag phase structure, morphology and change law of phase composition in roasting process were systematically analyzed by polarizing microscope, scanning electron microscope, electronic probe and energy disperse spectroscopy. It was found from polarizing microscope observation that the vanadium slag was mainly composed of vanadium spinel, metallic iron, silicate and ilmenite. The energy disperse spectroscopy results indicated that the vanadium spinel was mainly the vanadium-containing phase. The morphology change of vanadium slag in roasting process was observed by scanning electron microscope and electronic probe, and it was found that the vanadium spinel was finally oxidized and decomposed to form pseudobrookite, iron oxide and calcium vanadate. The vanadium conversion rate was possibly affected by the vanadium slag phase structure (the grain size of vanadium spinel, the binding phase distribution of silicate and the content of disperse metallic iron), the existence form of vanadium in clinkers, the content of generated calcium vanadate and the formation of high melting point silicates.
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