Solvent extraction and separation of heavy rare earths from chloride media using nonsymmetric (2,3-dimethylbutyl)(2,4,4′-trimethylpentyl)phosphinic acid

Wang, Junlian; Xie, Meiying; Wang, Huajun; Xu, Shengming

doi:10.1016/j.hydromet.2016.10.020

Cited by 34 publications

(6 citation statements)

References 21 publications

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“…The logarithmic acid dissociation constant (pK a ) and purity of the POAA can be determined by acid-base titration in 75 vol% alcohol using 0.01 mol L À1 NaOH as the standard solution and 0.5 vol% bromothymol blue as the indicator. 33 The water content of solid complexes was determined from the weight change before and aer drying at 100 C for 5 h. The mixture was stirred at 110 C for 2 h and a large amount of white solid phase was formed. A certain amount of NaOH was added to control pH > 11 throughout the reaction.…”

Section: Apparatus and Analytical Methodsmentioning

confidence: 99%

Effective removal of calcium and magnesium sulfates from wastewater in the rare earth industry

et al. 2019

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Section: Apparatus and Analytical Methodsmentioning

confidence: 99%

Effective removal of calcium and magnesium sulfates from wastewater in the rare earth industry

et al. 2019

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“…Rare earth elements, including 15 lanthanides (Lns) as well as scandium and yttrium, are of great economic importance because of their extensive applications in various industries such as catalysis, metallurgy, ceramics, medicine, display screens, laser technology, and electronics. − In last few decades, the extraction/separation of rare earths (REs) has attracted great attention due to their potential industrial and economical significance in addition to the increased demands of REs of high purity. Liquid–liquid extraction is a well-accepted supreme technique for the separation and purification of REs for commercial production. − Besides, extraction processes for the separation of lanthanides from high-level waste in the nuclear industry have also been developed because the light lanthanides are considered one of the major constituents in the fission products in spent nuclear fuel.…”

Section: Introductionmentioning

confidence: 99%

Selective Extraction of Light Lanthanides(III) by N,N-Di(2-ethylhexyl)-diglycolamic Acid: A Comparative Study with N,N-Dimethyl-diglycolamic Acid as a Chelator in Aqueous Solutions

et al. 2019

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The complexation and selectivity of N,N-di(2-ethylhexyl)-diglycolamic acid (HDEHDGA/kerosene, HA) toward the light lanthanides, La(III), Ce(III), Pr(III), and Nd(III), are presented for the extraction from chloride media. In the low pH region (pH 1.8–2.8), the obtained data reveal that the extraction of Ln(III) is governed by cation-exchange mechanism and is driven by the negative change in enthalpy. The results from the slope analysis method suggest the formation of LnA3·(HA)1or2 in the extraction process. As major extracted species with a core of LnA3 in the first coordination sphere, LnA3 might connect with one or two additional HA molecules in the second coordination sphere by hydrogen bonding. The LnA3 core might share similar coordination geometry to those of 1:3 Ln(III) complexes (LnA′3) with water-soluble N,N-dimethyl-diglycolamic acid (HDMDGA, HA′) formed in aqueous solutions or in solid-state compounds. The correlation between the extraction with HDEHDGA (HA) as an extractant and the complexation with HDMDGA (HA′) as a chelator has been explored by interpreting the separation factors for HA with the difference in the stability constants for HA′. Consequently, the ratios of the stability constants of the corresponding 1:3 complexes (LnA′3) with HDMDGA could be reasonably translated to the separation factors (SFs) with HDEHDGA, providing a valuable approach for understanding the origin of the extraction/separation mechanism. By comparing the extraction selectivity of HDEHDGA with that of the currently deployed extractants in the industry such as P204, P507, and Cyanex 272, HDEHDGA offers outstanding selectivity with considerable SFs (SFCe/La = 6.68, SFPr/Ce = 2.79, and SFNd/Pr = 2.65) for light Ln(III) pairs under conditions of low acid concentrations.

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“…Up to date, various types of extractants have been developed and applied in hydrometallurgy of REs. [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23] Among these extractants, carboxylic acids are promising and have been applied in REs hydrometallurgy for years. However, the extraction ability of carboxylic acids is not satisfactory, and structure optimization and synergistic extraction systems have been adopted to improve the extraction ability of carboxylic acids.…”

Section: Introductionmentioning

confidence: 99%

Improved Extraction of Rare Earths of La, Ce, Pr, and Nd by Optimizing the Structure of Phenoxyacetic Acid

Zhang

Guo

et al. 2021

ChemistrySelect

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A novel extractant, 2‐(2‐heptanoylphenoxy)acetic acid (HA), was synthesized and applied to extract La, Ce, Pr, and Nd from the hydrochloric acid solution. The extraction parameters including pH, temperature, concentrations of HA and chloride ion were investigated and discussed in detail. The extraction mechanism was studied with Fourier‐transform infrared (FT‐IR) spectroscopy. Compared with the extractant of sec‐octylphenoxy acetic acid (CA12), HA showed excellent performance and different extraction order in extracting La, Ce, Pr, and Nd. All the rare‐earth metals (REs) were extracted by the cation exchange mechanism and loaded as REs(A)3. The stripping test showed that the loaded REs in the organic phase can be effectively stripped with sulfuric acid at medium acidity. This work revealed that HA is an effective extractant for REs.

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Solvent extraction and separation of heavy rare earths from chloride media using nonsymmetric (2,3-dimethylbutyl)(2,4,4′-trimethylpentyl)phosphinic acid

Cited by 34 publications

References 21 publications

Effective removal of calcium and magnesium sulfates from wastewater in the rare earth industry

Effective removal of calcium and magnesium sulfates from wastewater in the rare earth industry

Selective Extraction of Light Lanthanides(III) by N,N-Di(2-ethylhexyl)-diglycolamic Acid: A Comparative Study with N,N-Dimethyl-diglycolamic Acid as a Chelator in Aqueous Solutions

Improved Extraction of Rare Earths of La, Ce, Pr, and Nd by Optimizing the Structure of Phenoxyacetic Acid

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