Enhancing the Recovery of Rare Earth Elements from Red Mud,Chemical Engineering & Technology

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Enhancing the Recovery of Rare Earth Elements from Red Mud
Chemical Engineering & Technology ( IF 1.8 ) Pub Date : 2021-07-26 , DOI: 10.1002/ceat.202100223
Ali Dawood Salman _{1,

2} , Tatjána Juzsakova ₁ , Ákos Rédey ₁ , Phuoc-Cuong Le ₃ , X. Cuong Nguyen _{4,

5} , Endre Domokos ₁ , Thamer A. Abdullah ₁ , Veronika Vagvolgyi ₁ , S. Woong Chang ₆ , D. Duc Nguyen _{6,

7}

Affiliation

An overview of methods used to enhance the recovery of rare earth elements (REEs) from bauxite residue or red mud (RM) is given. RM is a byproduct of the Bayer alumina production process. The composition of RM depends on the bauxite source and digestion protocol. This study aimed at developing and improving technological steps to recover REEs such as Sc, La, and Y from RM. Parameters such as leaching agent, contact time, temperature, and solid-to-liquid ratio were investigated to achieve optimum REE recovery from RM by combining hydrometallurgical steps such as acid digestion, ion exchange, and solvent extraction. The process was selected by considering its efficiency for selective recovery of Sc, La, and Y and suitability for subsequent solvent extraction and ion exchange of the leaching solution to separate the individual REEs.

中文翻译：

加强从赤泥中回收稀土元素

概述了用于提高从铝土矿残渣或赤泥 (RM) 中回收稀土元素 (REE) 的方法。RM 是拜耳氧化铝生产过程的副产品。RM 的组成取决于铝土矿来源和消化方案。本研究旨在开发和改进从 RM 中回收 REE 等 Sc、La 和 Y 的技术步骤。研究了浸出剂、接触时间、温度和固液比等参数，以通过结合酸解、离子交换和溶剂萃取等湿法冶金步骤从 RM 中实现最佳稀土回收率。该工艺的选择考虑了其选择性回收 Sc、La 和 Y 的效率以及后续溶剂萃取和浸出溶液离子交换以分离各个 REE 的适用性。

更新日期：2021-09-20

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