scholarly journals Solvent Extraction of Lanthanides(III) in the Presence of the Acetate Ion Acting as a Complexing Agent Using Mixtures of Cyanex 272 and Caprylic Acid in Hexane

Processes ◽  
2021 ◽  
Vol 9 (12) ◽  
pp. 2222
Author(s):  
Vera V. Belova ◽  
Yulia V. Tsareva ◽  
Yulia A. Zakhodyaeva ◽  
Vladimir K. Ivanov ◽  
Andrey A. Voshkin
Keyword(s):  
Caprylic Acid ◽  
Extraction Efficiency ◽  
Earth Metal ◽  
Complexing Agent ◽  
Extraction Ability ◽  
Extraction And Separation ◽  
Efficient Separation ◽  
Cyanex 272 ◽  
High Level ◽  
Extraction Isotherms

A new extraction system containing a mixture of Cyanex 272 and caprylic acid is proposed for the extraction and separation of lanthanides(III). It was shown that this system possesses a high level of extraction ability and capacity. The extraction of lanthanides(III) from chloride-acetate and nitrate-acetate media was investigated on an example of La(III). The composition of the extracted species was confirmed, based on the analysis of lanthanum(III) extraction isotherms. In the case of acetic-acetate aqueous solutions, a decrease in lanthanum(III) extraction efficiency was observed, due to the decreasing equilibrium pH of the aqueous phase in accordance with the cation-exchange mechanism. The composition of the synergistic mixture of Cyanex 272-caprylic acid established demonstrates highly efficient separation of rare-earth metal ions.

Solvent Extraction of Light Rare Earth Ions Using D2EHPA from Nitric Acid and Sulphuric Acid Solutions

2014 ◽  
Vol 970 ◽  
pp. 209-213 ◽  
Author(s):  
Mohamed Takip Khaironie ◽  
Markom Masturah ◽  
Meor Yusoff Meor Sulaiman ◽  
Salim Nazaratul Ashifa
Keyword(s):  
Rare Earth ◽  
Solvent Extraction ◽  
Sulphuric Acid ◽  
Extraction Efficiency ◽  
Earth Metal ◽  
Rare Earth Ions ◽  
Acid Solutions ◽  
Light Rare Earth ◽  
Extraction Ability ◽  
Extraction Percentage

A study on solvent extraction of a mixture of light rare earths ions (La (III), Nd (III) and Ce (IV)) from nitric and sulphuric acid solutions with di-(2-ethylhexyl) phosphoric acid (D2EHPA) in kerosene as an extractant has been carried out. The influences of D2EHPA and acid concentrations on the extraction efficiency of rare earth metal ions were evaluated. It was found that the extraction percentage of La, Nd and Ce decreased as the acids concentrations increased. On the contrary, the extraction efficiency of these ions increased as D2EHPA concentration increased. The utmost extraction percentage of La, Nd and Ce (99.4%, 99.7% and 100% respectively) was extracted from 0.1 M HNO3using 1.0 M D2EHPA. The order of extraction ability of the studied rare earth elements by D2EHPA decreased in the series of Ce (IV)>Nd (III)>La (III).

scholarly journals Solvent Extraction and Separation of Nd, Pr and Dy from Leach Liquor of Waste NdFeB Magnet Using the Nitrate Form of Mextral® 336At in the Presence of Aquo-Complexing Agent EDTA

Metals ◽  
2019 ◽  
Vol 9 (2) ◽  
pp. 269 ◽  
Author(s):  
Aarti Kumari ◽  
Kamala Kanta Sahu ◽  
Sushanta Kumar Sahu
Keyword(s):  
Rare Earth ◽  
Solvent Extraction ◽  
Ethylenediaminetetraacetic Acid ◽  
Earth Metal ◽  
Leach Solution ◽  
Complexing Agent ◽  
Analysis Method ◽  
Ndfeb Magnet ◽  
Extraction And Separation ◽  
The Fourier Transform

：Solvent extraction and separation of Pr, Nd and Dy from a synthetic leach solution of spent NdFeB magnet from wind turbines in the presence of aquo-complexing agent Ethylenediaminetetraacetic acid (EDTA) was studied using the nitrate form of Mextral® 336At ([336At][NO3]) as an extractant. The effect of different process parameters such as pH, extractant, nitrate, and EDTA concentrations on the extraction of Pr, Nd and Dy was studied. The extraction of these rare earths elements follows the order Pr > Nd > Dy, whereas EDTA forms stable complexes in the order Dy > Nd > Pr. The synergy of these two effects improved the selectivity among these elements as compared to when no aquo-complexing agent was used. The mechanism of extraction of rare earth elements was established by slope analysis method. The Fourier-Transform Infrared Spectroscopy (FTIR) spectra of [336At][NO3] and extracted Nd complex were recorded to understand the interaction of extractant with rare earth metal ions in the organic phase.

Heats of Formation of Alkali Metal and Alkaline Earth Metal Oxides and Hydroxides:  Surprisingly Demanding Targets for High-Level ab Initio Procedures

2003 ◽  
Vol 107 (29) ◽  
pp. 5617-5630 ◽  
Author(s):  
Michael B. Sullivan ◽  
Mark A. Iron ◽  
Paul C. Redfern ◽  
Jan M. L. Martin ◽  
Larry A. Curtiss ◽  
...  
Keyword(s):  
Alkali Metal ◽  
Metal Oxides ◽  
Ab Initio ◽  
Alkaline Earth ◽  
Earth Metal ◽  
Heats Of Formation ◽  
Alkaline Earth Metal ◽  
Alkaline Earth Metal Oxides ◽  
High Level

Extraction and separation studies of rare earth elements using Cyanex 272 impregnated Amberlite XAD-7 resin

2018 ◽  
Vol 181 ◽  
pp. 156-163 ◽  
Author(s):  
S. İnan ◽  
H. Tel ◽  
Ş. Sert ◽  
B. Çetinkaya ◽  
S. Sengül ◽  
...  
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Extraction And Separation ◽  
Cyanex 272

Intensified extraction and separation Pr (III)/Nd (III) from chloride solution in presence of a complexing agent using a serpentine microreactor

2018 ◽  
Vol 354 ◽  
pp. 1068-1074 ◽  
Author(s):  
Yuan He ◽  
Kaihua Chen ◽  
C. Srinivasakannan ◽  
Shiwei Li ◽  
Shaohua Yin ◽  
...  
Keyword(s):  
Chloride Solution ◽  
Complexing Agent ◽  
Extraction And Separation

scholarly journals Solvent Extraction of Didymium by TBP, Aliquat 336 and HDEHP in The Presence of Ca(NO3)2

2020 ◽  
Vol 10 (6) ◽  
pp. 2032
Author(s):  
Petr I. Matveev ◽  
Vladimir G. Petrov
Keyword(s):  
Nitric Acid ◽  
Extraction Efficiency ◽  
Calcium Nitrate ◽  
High Capacity ◽  
Water Soluble ◽  
Complexing Agents ◽  
Aliquat 336 ◽  
Influence Of Water ◽  
Cation Extraction ◽  
Extraction Isotherms

Three commercially available extractants (tri-butyl-phosphate (TBP), di-(2-ethylhexyl)phosphoric acid (HDEHP) and Aliquat 336 (a mixture of quaternary ammonium bases)) were tested for separation of Pr(III) and Nd(III) in both static and dynamic modes. In the case of HDEHP, phase stability and influence of nitric acid were considered. Extraction isotherms were constructed, and influence of water-soluble complexing agents on the separation factor was investigated for Aliquat 336. In the case of TBP, influence of calcium nitrate in aqueous phase on the extraction efficiency was investigated. Model countercurrent experiments were conducted for TBP and Aliquat 336. It was shown that TBP is the best choice due to its high capacity and cation extraction order (Nd > Pr).

Improved visible-light photoactivities of porous LaFeO3 by coupling with nanosized alkaline earth metal oxides and mechanism insight

2019 ◽  
Vol 9 (12) ◽  
pp. 3149-3157 ◽  
Author(s):  
Iltaf Khan ◽  
Ning Sun ◽  
Ziqing Zhang ◽  
Zhijun Li ◽  
Muhammad Humayun ◽  
...  
Keyword(s):  
Visible Light ◽  
Metal Oxides ◽  
Alkaline Earth ◽  
Earth Metal ◽  
Alkaline Earth Metal ◽  
Dual Functional ◽  
Alkaline Earth Metal Oxides ◽  
High Level

It is significant to improve visible-light photoactivities of porous LaFeO3 by coupling with nanosized alkaline earth metal oxides as dual-functional platform for accepting the high level electrons and activating CO2.

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