Physicochemical properties of DMI-LiNO<SUB>3</SUB> solvated ionic liquid andits application in electrodeposition of neodymium at room temperature

Ai-minLIU,YuYAO,Meng-xiaGUO,Yu-baoLIU,Zhong-ningSHI,Feng-guoLIU,Xian-weiHU,Wen-caiHE,Zhao-wenWANG

doi:10.1016/S1003-6326(21)65672-8

Transactions of Nonferrous Metals Society of China >

2021 , Vol. 31 >Issue 8: 2522 - 2531

DOI: https://doi.org/10.1016/S1003-6326(21)65672-8

Mining, Minerals Processing and Metallurgical Engineering

Physicochemical properties of DMI-LiNO₃ solvated ionic liquid andits application in electrodeposition of neodymium at room temperature

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Ai-min LIU¹, Yu YAO¹, Meng-xia GUO¹, Yu-bao LIU², Zhong-ning SHI³, Feng-guo LIU¹, Xian-wei HU¹, Wen-cai HE¹, Zhao-wen WANG¹

1. Key Laboratory for Ecological Metallurgy of Multimetallic Mineral (Ministry of Education), Northeastern University, Shenyang 110819, China;
2. State Key Laboratory of Baiyunobo Rare Earth Resource Researches and Comprehensive Utilization, Baotou Research Institute of Rare Earths, Baotou 014030, China;
3. State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, China

Online published: 2021-08-25

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Abstract

The density, conductivity, and viscosity of the 1,3-dimethyl-2-imidazolinone and lithium nitrate (DMI- LiNO₃) solvated ionic liquid were measured as a function of temperature. Additionally, the electrochemical mechanism and electrodeposition of neodymium from the DMI-LiNO₃ solvated ionic liquid were investigated. Cyclic voltammetry results indicate that the electrochemical reduction of Nd(III) is irreversible and proceeds via one-step with three-electron transfer, which is controlled by diffusion with a diffusion coefficient of 5.08×10^-8 cm²/s. Energy- dispersive X-ray spectrometry and X-ray photoelectron spectroscopy data confirm that the electrodeposit obtained after electrodeposition at -4 V (vs Ag) using the DMI-LiNO₃-Nd(CF₃SO₃)₃ solvated ionic liquid contains metallic neodymium.

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Ai-minLIU,YuYAO,Meng-xiaGUO,Yu-baoLIU,Zhong-ningSHI,Feng-guoLIU,Xian-weiHU,Wen-caiHE,Zhao-wenWANG . Physicochemical properties of DMI-LiNO₃ solvated ionic liquid andits application in electrodeposition of neodymium at room temperature[J]. Transactions of Nonferrous Metals Society of China, 2021 , 31(8) : 2522 -2531 . DOI: 10.1016/S1003-6326(21)65672-8

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