钒云母氧化焙烧机理研究

发布时间：2018-05-25 09:43

  本文选题：钒云母 + 晶体结构　； 参考：《金属矿山》2017年03期

【摘要】：通过TG-DSC、XRD、SEM分析以及化学浸出试验,研究了氧化焙烧过程中钒云母晶体结构和钒赋存状态的变化情况,以及这些变化对钒浸出效果的影响,探讨了钒云母的氧化焙烧机理。结果表明:1在升温过程中,钒云母依次失去层间吸附水、结晶水和羟基水。2钒云母晶体结构非常稳固,焙烧温度小于850℃时,钒云母仅发生晶体结构调整。焙烧温度低于600℃,主要发生V~(3+)的氧化反应;焙烧温度为600~850℃,V~(3+)和V~(4+)的氧化反应同时存在,但主要发生V~(4+)的氧化反应;焙烧温度大于850℃,羟基的脱除导致云母层间结合力减弱,矿物结构失去原有的稳定性,出现松散解体趋势,V~(3+)和V~(4+)的氧化反应均达到平衡;焙烧温度大于1 000℃,钒云母的晶体结构遭到破坏,原有的矿物形态逐渐消失,向非晶态玻璃相转化。
[Abstract]:The changes of crystal structure and state of vanadium mica during oxidation roasting were studied by means of SEM analysis and chemical leaching test. The effects of these changes on the leaching effect of vanadium were studied. The oxidation roasting mechanism of vanadium mica was discussed. The results show that the vanadium mica loses the interlaminar adsorbed water in turn, and the crystal structure of crystal water and hydroxyl water is very stable. When the calcination temperature is less than 850 鈩，

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