Sangmin Park , Jaeyun Jeong , Seunghun Cha , Yoonhyung Keum , Ju-Young Cho , Hyungbeen Park , Taek-Soo Kim , Dae-Kyeom Kim , Myungsuk Song
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In this work, reverse selectivity is applied instead of conventional liquid metal extraction (c-LME) for the direct separation of REs in a single stage. Niobium (Nb) is selected because of its thermodynamic properties for enhancing the selectivity of the reactions between the extractant and other elements, excluding REs. The process is thermodynamically designed for liquation systems, and it reflects the interactions between the extractant and magnets. The solidification behavior based on the selective growth of phases without REs is shown with variations in the composition and cooling rate to confirm the kinetics. The composition prevents the formation of RE-Fe intermetallic compounds, and excess Nb is considered a bottleneck for separating REs. In addition, the cooling rate influences the agglomeration of RE as a layer. Because of the manipulation of the liquation, 92.89% of the REs are successfully separated in the form of accumulated layers. This effective process for the direct separation of REs is verified through thermodynamic and experimental assessments. 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引用次数: 0
摘要
由于工业化的主要目标已转变为碳中和,稀土(REs)在绿色工业中的重要性也随之增加。由于对稀土的需求不断增加,通过绿色生产工艺实现可持续资源是必要的。基于稀土和萃取剂之间的选择性反应,液态金属萃取被认为是支持资源可持续性的领先技术。然而,这一过程需要多个阶段,包括预处理、萃取和分离,这被认为是工业化的瓶颈。在这项工作中,采用反向选择性代替传统的液态金属萃取(c-LME),在一个阶段内直接分离出 REs。之所以选择铌(Nb),是因为铌的热力学特性可以提高萃取剂与其他元素(不包括 REs)之间反应的选择性。该工艺的热力学设计适用于液化系统,它反映了萃取剂与磁体之间的相互作用。基于不含 RE 的相的选择性生长的凝固行为,随着成分和冷却速率的变化而变化,从而证实了动力学。成分会阻止 RE-Fe 金属间化合物的形成,而过量的 Nb 被认为是分离 REs 的瓶颈。此外,冷却速度也会影响作为层的 RE 的团聚。通过对液化过程的控制,92.89% 的可再 生金属以积聚层的形式被成功分离。通过热力学和实验评估,验证了这种直接分离 RE 的有效工艺。总之,这项研究可以在未来的研究中提高该系统的能效,为循环经济的建设提供新的指导。
Selective growth of Nb–Fe–B intermetallic compounds for the direct separation of rare earths based on manipulating liquation
Since the primary goal of industrialization has changed to carbon neutrality, the importance of rare earths (REs) has increased due to their criticality in green industries. The attainment of sustainable resources via green production processes is necessary due to the increasing need for REs. Liquid metal extraction is regarded as a leading technology for supporting the sustainability of resources based on the selective reactivity between REs and extractants. However, this process requires multiple stages, including pretreatment, extraction and separation, which are considered bottlenecks in industrialization. In this work, reverse selectivity is applied instead of conventional liquid metal extraction (c-LME) for the direct separation of REs in a single stage. Niobium (Nb) is selected because of its thermodynamic properties for enhancing the selectivity of the reactions between the extractant and other elements, excluding REs. The process is thermodynamically designed for liquation systems, and it reflects the interactions between the extractant and magnets. The solidification behavior based on the selective growth of phases without REs is shown with variations in the composition and cooling rate to confirm the kinetics. The composition prevents the formation of RE-Fe intermetallic compounds, and excess Nb is considered a bottleneck for separating REs. In addition, the cooling rate influences the agglomeration of RE as a layer. Because of the manipulation of the liquation, 92.89% of the REs are successfully separated in the form of accumulated layers. This effective process for the direct separation of REs is verified through thermodynamic and experimental assessments. Overall, this investigation can provide new guidelines for the construction of a circular economy after improving the energy efficiency of this system in future research.
期刊介绍:
Materials Today Sustainability is a multi-disciplinary journal covering all aspects of sustainability through materials science.
With a rapidly increasing population with growing demands, materials science has emerged as a critical discipline toward protecting of the environment and ensuring the long term survival of future generations.