scholarly journals Extraction of Rare Earth Elements from Chloride Media with Tetrabutyl Diglycolamide in 1-Octanol Modified Carbon Dioxide

Metals ◽  
2019 ◽  
Vol 9 (4) ◽  
pp. 429 ◽  
Author(s):  
Mary Case ◽  
Robert Fox ◽  
Donna Baek ◽  
Chien Wai
Keyword(s):  
Carbon Dioxide ◽  
Aqueous Solution ◽  
Rare Earth ◽  
Rare Earth Elements ◽  
Modern World ◽  
Ndfeb Magnet ◽  
Phosphor Material ◽  
Aqueous Chloride ◽  
Hcl Concentration ◽  
Optimized Conditions

Rare earth elements (REEs) are critical to our modern world. Recycling REEs from used products could help with potential supply issues. Extracting REEs from chloride media with tetrabutyl diglycolamide (TBDGA) in carbon dioxide could help recycle REEs with less waste than traditional solvents. Carbon dioxide as a solvent is inexpensive, inert, and reusable. Conditions for extraction of Eu from aqueous chloride media were optimized by varying moles percent of 1-octanol modifier, temperature, pressure, Eu concentration, TBDGA concentration, Cl− concentration, and HCl concentration. These optimized conditions were tested on a Y, Ce, Eu, Tb simulant material, REEs containing NdFeB magnets, and lighting phosphor material. The optimized conditions were found to be 23 °C, 24.1 MPa, 0.5 mol% 1-octanol, with an excess of TBDGA. At these conditions 95 ± 2% Eu was extracted from 8 M (mol/m3) HCl. Extraction from the mixed REE simulate material resulted in separation of Y, Eu, and Tb from the Ce which remained in the aqueous solution. The extraction on NdFeB magnet dissolved into 8 M HCl resulted in extraction of Pr, Nd, Dy, and Fe >97%. This results in a separation from B, Al, and Ni. Extraction from a trichromatic lighting phosphor leachate resulted in extraction of Y and Eu >93% and no extraction of Ba, Mg, and Al.

Sustainable Recycling of Rare-Earth Elements from NdFeB Magnet Swarf: Techno-Economic and Environmental Perspectives

2021 ◽  
Author(s):  
Nighat Afroz Chowdhury ◽  
Sidi Deng ◽  
Hongyue Jin ◽  
Denis Prodius ◽  
John W. Sutherland ◽  
...  
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Ndfeb Magnet

Recovery of Rare Earth Elements from NdFeB Magnet Scraps by Pyrometallurgical Processes

2015 ◽  
pp. 239-248
Author(s):  
Yuyang Bian ◽  
Shuqiang Guo ◽  
Kai Tang ◽  
Lan Jiang ◽  
Changyuan Lu ◽  
...  
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Ndfeb Magnet

scholarly journals Upconversion nanoparticles based on rare-earth elements

2019 ◽  
Vol 220 ◽  
pp. 03033
Author(s):  
Dmitrii Zharkov ◽  
Andrey Leontyev ◽  
Artemii Smelev ◽  
Victor Nikiforov ◽  
Vladimir Lobkov ◽  
...  
Keyword(s):  
Experimental Data ◽  
Aqueous Solution ◽  
Rare Earth ◽  
Laser Radiation ◽  
Rare Earth Elements ◽  
Hydrothermal Method ◽  
Water Soluble ◽  
Upconversion Nanoparticles ◽  
Biological Applications ◽  
Intense Luminescence

Using the hydrothermal method, we synthesized water soluble YVO4: Yb, Er nanoparticles with a size less than 10 nm. Nanoparticles exhibit intense luminescence in the green region due to Er3+ ions when excited by laser radiation at a wavelength of 980 nm as a result of the up-conversion process. Bright and stable luminescence also persists in an aqueous solution of nanoparticles. Based on experimental data, it can be argued that the objects obtained are promising in biological applications, as well as up-conversion phosphors.

scholarly journals Amine Sorbents for Selective Recovery of Heavy Rare‐Earth Elements (Dysprosium, Ytterbium) from Aqueous Solution

ChemPlusChem ◽  
2020 ◽  
Vol 85 (1) ◽  
pp. 130-136 ◽  
Author(s):  
Qiuming Wang ◽  
Brian W. Kail ◽  
Walter C. Wilfong ◽  
Fan Shi ◽  
Thomas J. Tarka ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Rare Earth ◽  
Rare Earth Elements ◽  
Heavy Rare Earth ◽  
Selective Recovery ◽  
Heavy Rare Earth Elements ◽  
Amine Sorbents

Scanning Electron Microscope-Cathodoluminescence Analysis of Rare-Earth Elements in Magnets

2016 ◽  
Vol 22 (1) ◽  
pp. 82-86 ◽  
Author(s):  
Susumu Imashuku ◽  
Kazuaki Wagatsuma ◽  
Jun Kawai
Keyword(s):  
Rare Earth ◽  
Electron Microscope ◽  
Hydrochloric Acid ◽  
Scanning Electron Microscope ◽  
Rare Earth Elements ◽  
Luminescence Spectra ◽  
Ndfeb Magnet ◽  
Ndfeb Magnets ◽  
X Ray ◽  
Scanning Electron

AbstractScanning electron microscope-cathodoluminescence (SEM-CL) analysis was performed for neodymium–iron–boron (NdFeB) and samarium–cobalt (Sm–Co) magnets to analyze the rare-earth elements present in the magnets. We examined the advantages of SEM-CL analysis over conventional analytical methods such as SEM-energy-dispersive X-ray (EDX) spectroscopy and SEM-wavelength-dispersive X-ray (WDX) spectroscopy for elemental analysis of rare-earth elements in NdFeB magnets. Luminescence spectra of chloride compounds of elements in the magnets were measured by the SEM-CL method. Chloride compounds were obtained by the dropwise addition of hydrochloric acid on the magnets followed by drying in vacuum. Neodymium, praseodymium, terbium, and dysprosium were separately detected in the NdFeB magnets, and samarium was detected in the Sm–Co magnet by the SEM-CL method. In contrast, it was difficult to distinguish terbium and dysprosium in the NdFeB magnet with a dysprosium concentration of 1.05 wt% by conventional SEM-EDX analysis. Terbium with a concentration of 0.02 wt% in an NdFeB magnet was detected by SEM-CL analysis, but not by conventional SEM-WDX analysis. SEM-CL analysis is advantageous over conventional SEM-EDX and SEM-WDX analyses for detecting trace rare-earth elements in NdFeB magnets, particularly dysprosium and terbium.

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