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首页> 外文期刊>RSC Advances >Phase transformations of vanadium recovery from refractory stone coal by novel NaOH molten roasting and water leaching technology
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Phase transformations of vanadium recovery from refractory stone coal by novel NaOH molten roasting and water leaching technology

机译：新型NaOH熔融焙烧和水浸工艺从难处理石煤中回收钒的相变。

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摘要

In this study, a novel NaOH molten roasting and water leaching technology, an eco-friendly process with good selectivity and good availability, was investigated for vanadium recovery from refractory stone coal. In addition, the phase transformations during the vanadium recovery process were also studied. During the NaOH molten roasting process, the monoclinic crystalline structure of muscovite (K(Al,V)2[Si3AlO10](OH)2) was converted into the orthorhombic crystalline structure of Na2SiO3 and the tetragonal crystalline structure of gehlenite (Ca2Al2SiO7); this could promote the liberation and recovery of vanadium. During the water leaching process, the tetragonal crystalline structure of gehlenite (Ca2Al2SiO7) was converted into the monoclinic crystalline structure of Ca3Si2O7·H2O. Ca3Si2O7·H2O, a kind of C–S–H gel, produced during the water leaching process probably covered the surface of the roscoelite and thus prevented effective vanadium recovery from roscoelite.
机译：在这项研究中，研究了一种新型的NaOH熔融焙烧和水浸技术，一种具有良好的选择性和可用性的环保方法，用于从耐火石煤中回收钒。此外，还研究了钒回收过程中的相变。在NaOH熔融焙烧过程中，白云母（K（Al，V） 2 [Si 3 AlO 10 ]（OH） 2 ）被转化为Na 的正交晶体结构 2 SiO 3 和钠钙石的四方晶结构（Ca 2 Al 2 SiO 7 ）;这可以促进钒的释放和回收。在水浸过程中，钠钙石（Ca 2 Al 2 SiO < sub> 7 ）转换为Ca 3 Si 2 的单斜晶体结构small> O 7 ·H 2 O。 Ca 3 Si 2 O 7 ·H在水浸过程中产生的 2 O（一种C–S–H凝胶）可能覆盖了钙锰矿的表面，从而阻止了从钙锰矿中有效回收钒。

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