2009•The Chinese Journal of Nonferrous MetalsRequires access
Mechanism of oxidizing roasting process of vanadium containing stone coal
Yiping Lu
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Abstract
The oxidizing roasting process of vanadium containing stone coal was investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy spectrum analysis (EDX), and the effects of roasting conditions on leaching rate of vanadium were studied. The results show that in the roasting process, the organic matter and pyrite are oxidized firstly. When the roasting temperature is in the range of 750-850 ℃, the crystal structure of illite containing vanadium is gradually destroyed, the oxidation reaction of V( Ⅲ) and V( Ⅳ) reaches a balance, and the leaching rate of vanadium reaches the best. When the roasting temperature reaches 1 050 ℃, the vanadium is enwrapped by sintered matter, which is the main reason making the leaching rate of vanadium decrease quickly.