The Synergistic Extraction of Sm(NO3)3and Gd(NO3)3by a Mixture of Tributyl Phosphate and Aliquat 336 in AMSCO and Ammonium Nitrate Medium

Huang, Chun-Hui; Bautista, Renato G.

doi:10.1080/01496398308056120

Cited by 10 publications

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“…According to most of the research cited above on the extraction of REE nitrates by mixtures of quaternary ammonium nitrates and neutral organophosphorus compounds (NOPC) [16][17][18][19][20][21][22][23], the general formula of the resulting compounds can be written as follows: (R 4 N) n [Ln(NO 3 ) 3+n •mS], where S is the NOPC molecule, n = 1-3, m = 1-4. Various studies have shown that the nitrate groups of TOMANO 3 and phosphoryl groups of NOPC are included in the internal coordination sphere of the mixed complex.…”

Section: Introductionmentioning

confidence: 99%

“…Various studies have shown that the nitrate groups of TOMANO 3 and phosphoryl groups of NOPC are included in the internal coordination sphere of the mixed complex. The main postulated mechanism of formation of such mixed complexes is the substitution of NOPC molecules in Ln(NO 3 ) 3 •3S trisolvates with R 4 NNO 3 nitrate ligands [8,15,16,18]. The main differences in the compositions of the extractable mixed REE compounds determined in the various studies are in the number of nitrate and phosphoryl groups that are simultaneously part of the complex.…”

Section: Introductionmentioning

confidence: 99%

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Separation of Rare-Earth Elements from Nitrate Solutions by Solvent Extraction Using Mixtures of Methyltri-n-octylammonium Nitrate and Tri-n-butyl Phosphate

et al. 2022

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The article presents data on the solvent extraction separation of rare-earth elements (REEs), such as La(III), Ce(III), Pr(III), and Nd(III), using synergic mixtures of methyltrioctylammonium nitrate (TOMANO3) with tri-n-butyl phosphate (TBP) from weakly acidic nitrate solutions. Specifically, experimental results on separation of REEs, for the pair Ce(III)/Pr(III) for quaternary mixtures of REEs (La(III), Ce(III), Pr(III), Nd(III)) and for the pair La(III)/Pr(III) for solutions containing La(III), Pr(III), and Nd(III), are presented. It was shown that effective separation for the pair Ce(III)/Pr(III) from a solution containing 219 g Ce(III)/L, 106 g La(III)/L, 20 g Pr(III)/L, 55 g Nd(III)/L, and 0.1 mol/L HNO3, was achieved using 56 steps of a multistage, counter-current solvent extraction cascade with scrubbing, at an organic-to-aqueous phase volume ratio (O/A) equal to 2/1 on the extraction section and O/A equal to 4/1 on the scrubbing section, using 3.3 mol/L solutions of the mixture TOMANO3-TBP with molar ratio 0.15:0.85 in dodecane. Separation for the pair La(III)/Pr(III) could be achieved using a solvent extraction cascade with scrubbing in 32 steps at O/A equal to 2/1 on the extraction section and O/A equal to 2.8/1 on the scrubbing section of the solvent extraction cascade from a solution containing 258 g La(III)/L, 58 g Pr(III)/L, 141 g Nd(III)/L, and 0.1 mol/L HNO3 with 3.0 mol/L solution of the mixture TOMANO3-TBP with molar ratio 0.2:0.8 in dodecane.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%