Effect of diluents on extraction behavior of rare earth elements with N,N,N′,N′-tetrabutyl-3-oxy-glutaramide from hydrochloric acid

Abstract Rare earth elements (REEs) have obtained a greatest significant in human lives owing to their important roles in various high technology applications. The present method development was deal technology important REEs such as neodymium, terbium and dysprosium, selective extraction with possible separation and recovery studies, successfully. The chloride mediated mixed aqueous solution containing 1500 mg/L each of REEs such as Nd, Tb and Dy was subjected at selective separation of Nd from other associated REEs. Three organo-phosphorous based commercial extracting agents such as Cyanex 272, PC 88A and D2EHPA, were employed for the extraction, possible separation and recovery of rare earth elements. A comparative extraction behavior of all these three extractants as function of time, pH influence, extractant concentration, temperature and diluents were systematically investigated. The extraction tendency of organo-phosphorus reagents towards the extraction of either of the REEs follows of the sequence as: D2EHPA > PC 88A > Cyanex 272. The thermodynamic behavior of either of the extractants on liquid–liquid extraction processing of REEs was investigated and thermodynamic calculations were calculated and presented. Substantial recovery of neodymium oxalate followed by its calcined product as neodymium oxide was ascertained from XRD study and SEM–EDS analysis.

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

Microscopy and Microanalysis ◽

10.1017/s1431927615015676 ◽

2016 ◽

Vol 22 (1) ◽

pp. 82-86 ◽

Cited By ~ 3

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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Extraction of Sm(III)and Nd(III) with N,N,N’,N’-tetrabutyl-3-oxy-diglycolamidefrom hydrochloric acid

Journal of the Serbian Chemical Society ◽

10.2298/jsc110922077y ◽

2013 ◽

Vol 78 (1) ◽

pp. 93-100 ◽

Cited By ~ 10

Author(s):

J.H. Yang ◽

Y. Cui ◽

G.X. Sun ◽

Y. Nie ◽

G.M. Xia ◽

...

Keyword(s):

Rare Earth ◽

Hydrochloric Acid ◽

Ir Spectra ◽

Acid Concentration ◽

Distribution Ratio ◽

Hydrochloric Acid Concentration ◽

Extractant Concentration ◽

Extraction Mechanism ◽

Extraction Behavior ◽

Loaded Organic Phase

The extraction behavior of Sm(III) and Nd(III) with N,N,N?,N?-tetrabutyl-3-oxa-diglycolamide (TBDGA) in 70% kerosene-30% n-octanol from hydrochloride acid wasstudied. The effect of hydrochloric acid concentration, extractant concentration,and temperature on the distribution of rare earth elementswas investigated. The extraction mechanism was established and the stoichiometry of the main extracted species was confirm to be SmCl3?2TBDGA and NdCl3?2TBDGA for Sm(III) and Nd(III), respectively. The extraction distribution ratio decreases with an increase in temperature, which demonstrates that the extraction reaction is exothermic. The IR spectra of the loaded organic phase and free extractant were recorded and discussed.

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A Study on the Leaching of Rare Earth Elements from Waste Phosphor Powder

Korean Journal of Metals and Materials ◽

10.3365/kjmm.2021.59.7.459 ◽

2021 ◽

Vol 59 (7) ◽

pp. 459-468

Author(s):

Gee Hun Lee ◽

Chang Kwon Kim ◽

Dong Hoon Lee ◽

Young Jun Song

Keyword(s):

Rare Earth ◽

Sulfuric Acid ◽

Nitric Acid ◽

Hydrochloric Acid ◽

Acid Solution ◽

Rare Earth Elements ◽

Nitric Acid Solution ◽

Reaction Rate ◽

Phosphor Powder ◽

Leaching Reaction

This study was carried out to obtain data to design a process to recover rare earth elements, specifically Y(Yttrium), La(Lanthanum), Ce(Cerium), Eu(Europium), Tb(Terbium) from waste phosphor powder. For this purpose, we investigated the effect of temperature, concentration, time and acids on leaching of the rare earth elements. The effect of roasting temperature, roasting time, roasting agent and its dosage on the leaching of rare earth elements were also investigated. 92% of the Yttrium, 70% of the Europium and 8% of the Cerium contained in the waste phosphor powder was leached at the condition of 50 oC and 0.3N HCl solution for 3hours. However, Terbium and Lanthanum were never leached at this condition. The leaching ratio increased to 100% of Yttrium and Europium, 98% of Cerium, 92% of Terbium and 89% of Lanthanum by leaching after soda ash roasting. In the leaching experiment with unroasted phosphor at 80 oC, the initial leaching reaction rate of Yttrium was 0.035 mol/L·s in 0.3N sulfuric acid solution, 0.033 mol/L·s in nitric acid solution and 0.028 mol/L·s in 0.3N hydrochloric acid solution. And the initial leaching reaction rate of Europium was 0.0017 mol/L·s in 0.3N sulfuric acid solution, 0.00114 mol/L·s in nitric acid solution and 0.00113 mol/L·s in 0.3N hydrochloric acid solution. For Cerium, the initial leaching reaction rate was 0.00019 mol/L·s in 0.3N sulfuric acid solution, 0.00025 mol/L·s in nitric acid solution and 0.00014 mol/L·s in 0.3N hydrochloric acid solution.

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