Effect of alkaline fusion on muscovite decomposition and the vanadium release mechanism from vanadium shale.
Effect of alkaline fusion on muscovite decomposition and the vanadium release mechanism from vanadium shale.
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碱熔对白云母分解的影响及钒页岩的钒释放机制
DOI：
10.1098/rsos.180700
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发表时间：
2018-10
影响因子：
3.5
通讯作者：
Liu H
中科院分区：
文献类型：
--
作者：
Jian X;Huang J;Cai Z;Zhang Y;Liu T;Liu H
为了弄清碱熔过程中白云母的分解和钒页岩中钒的释放机理，对碱熔过程中钒的释放过程和焙烧动力学进行了研究。研究发现，氢氧化钠的加入使白云母转变为水玻璃和钙铝黄长石。这一过程促进了硅的溶解和白云母的破坏，有利于钒的释放。动力学分析表明，随着焙烧时间的延长，钒转化反应的控制步骤由化学反应控制转变为扩散控制。与扩散控制步骤相比，钒相关的化学反应在第一阶段完成。碱熔反应促进了白云母的分解，加快了钒的释放，降低了焙烧过程对高温和时间的依赖。化学反应控制和扩散控制的表观活化能分别为42.24 kJ mol−1和-9.553 kJ mol−1。最终建立了碱熔法从钒页岩中提钒的动力学模型。
In order to figure out the decomposition of muscovite and the release mechanism of vanadium from vanadium shale in the alkaline fusion process, the process of vanadium release and roasting kinetics by alkaline fusion was studied. It was found that the addition of sodium hydroxide made the muscovite convert into the sodium silicate and gehlenite. This process promoted the dissolution of silicon and the destruction of muscovite, which could facilitate the release of vanadium. The kinetic analysis indicated that the controlling step of vanadium transformation reaction is changed from chemical reaction control to diffusion control with the increase of roasting time. Compared to the diffusion controlling step, the vanadium related chemical reaction was completed in the first period. The alkaline fusion reaction enhanced the decomposition of muscovite, which could accelerate the release of vanadium and reduce the dependence on high temperature and time in the roasting process. The apparent activation energies of chemical reaction control and diffusion control were 42.24 kJ mol−1 and −9.553 kJ mol−1, respectively. The kinetic model of vanadium extraction from vanadium shale using alkaline fusion could be finally established.
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