Efficient recovery of neodymium and praseodymium from NdFeB magnet-leaching phase with and without ionic liquid as a car
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ORIGINAL PAPER
Efficient recovery of neodymium and praseodymium from NdFeB magnet‑leaching phase with and without ionic liquid as a carrier in the supported liquid membrane Mehdi Asadollahzadeh1 · Rezvan Torkaman1 · Meisam Torab‑Mostaedi1 · Alireza Hemmati2 · Ahad Ghaemi2 Received: 14 February 2020 / Accepted: 1 June 2020 © Institute of Chemistry, Slovak Academy of Sciences 2020
Abstract In this study, the presence and absence of ionic liquids as a carrier in the SLM system was investigated for the extraction of praseodymium and neodymium ions from the NdFeB magnet-leaching solution. The rate of permeability coefficient in the ion transport process inside the supported liquid membrane was studied by utilizing the variation in the acidity of the source and stripping phases and the role of different carriers in the transport. The highest permeability coefficients were obtained with the synergistic system containing [C6MIM][NTf2], TOPO, and TPB extractants. The higher efficiency is related to the particular ionic property in the extraction of rare earth ions compared with TOPO, and TBP extractants diluted in kerosene. The experimental data of the acidity of the source and stripping phases showed that the neutral pH ~ 6 in the feed phase and the average acidity of 1.8 M nitric acid in the stripping phase were suitable for the transport of ions between both phases. The kinetics of ion transport inside the ionic liquid membrane based on logarithmic variations showed that the process of ion transfer inside the membrane follows the first-order kinetics. The investigation of stability with ionic liquids indicated that a more stable system was provided with ionic liquid as a green solvent in the carrier phase. Keywords NdFeB magnet · Ionic liquid · Rare elements · Supported liquid membrane · Green solvent · TOPO and TBP extractants
Introduction In the modern world, rare earth metals have different applications in industry and technology and it has always been on the path to the favorable utilization of these elements (Krishnamurthy and Gupta 2015). Their unique properties showed an increase in the desirability and efficiency of the products (Atwood 2012). In recent years, magnetism has dramatically improved with the progress of permanent magnets, including rare earth metals (Furlani 2001). Neodymium iron boron (NdFeB) magnets have high magnet strength, * Mehdi Asadollahzadeh [email protected];[email protected]; [email protected] 1
Materials and Nuclear Fuel Research School, Nuclear Science and Technology Research Institute, P.O. Box, 11365‑8486 Tehran, Iran
School of Chemical, Petroleum and Gas Engineering, Iran University of Science and Technology (IUST), P.O. Box 16765‑163, Tehran, Iran
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more exceptional durability, and lower cost than ferrous magnets. Specific applications for this magnet have been reported in the electric and hybrid automotive, generators, boats, wind turbines, relays, switches, scanners, transformers, and speakers (Atwood 2012). The stream from chips an
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