Mechanism of oxidizing roasting process of vanadium containing stone coal
Mechanism of oxidizing roasting process of vanadium containing stone coal
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发表时间：
2009
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通讯作者：
Lu Yi-ping
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作者：
Lu Yi-ping
采用X射线衍射（XRD）、扫描电镜（SEM）和能谱分析（EDX）等方法研究了含钒石煤氧化焙烧过程，考察了焙烧条件对钒浸出率的影响。结果表明，在焙烧过程中，有机质和黄铁矿首先被氧化。当焙烧温度在750-850 ℃范围内时，含钒伊利石晶体结构逐渐被破坏，V（Ⅲ）和V（Ⅳ）的氧化反应达到平衡，钒的浸出率达到最佳。当焙烧温度达到1 050 ℃时，钒被烧结物包裹，这是钒浸出率急剧下降的主要原因。
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.