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Selective precipitation of rare earth and critical elements from acid mine drainage - Part I: Kinetics and thermodynamics of staged precipitation process
Resources, Conservation and Recycling ( IF 13.2 ) Pub Date : 2022-09-16 , DOI: 10.1016/j.resconrec.2022.106654
Behzad Vaziri Hassas, Younes Shekarian, Mohammad Rezaee

Critical elements (CEs) have been in the spotlight recently due to their promising role in green energy transition and high-tech developments. Secondary resources, such as acid mine drainage (AMD) are of great potential source for these elements. Selective recovery of CEs such as Al, rare earth elements (REEs), Co, and Mn from AMD is deemed viable. To design and scale up the CEs recovery process, parameters such as kinetics and other thermodynamics parameters are vital. This work determined the reaction rates for precipitation of the Al, REEs, Co, and Mn in a three-staged precipitation process. The experimental data were examined with Avrami and second-order kinetics models. Analyzing the parameters driving and controlling the precipitation showed that the mechanism in the precipitation of elements from the solution is the supersaturation of species. Furthermore, the condensation and polymerization of the metal ions with ligand molecules results in large polycation complexation and growth.



中文翻译:

从酸性矿山排水中选择性沉淀稀土和关键元素 - 第 I 部分:分级沉淀过程的动力学和热力学

关键要素 (CEs) 最近因其在绿色能源转型和高科技发展中的巨大作用而备受关注。二次资源,如酸性矿山排水(AMD)是这些元素的巨大潜在来源。从 AMD 选择性回收铝、稀土元素 (REE)、钴和锰等 CE 被认为是可行的。为了设计和扩大 CE 回收过程,动力学和其他热力学参数等参数至关重要。这项工作确定了三阶段沉淀过程中 Al、REEs、Co 和 Mn 沉淀的反应速率。用 Avrami 和二级动力学模型检查了实验数据。分析驱动和控制沉淀的参数表明,元素从溶液中沉淀出来的机理是物质的过饱和。此外,金属离子与配体分子的缩合和聚合导致大量的聚阳离子络合和生长。

更新日期:2022-09-16
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