Observations on the separation factors of the rare earths with various ligands

Rowlands, D.L.G.

doi:10.1016/0022-1902(67)80338-5

Cited by 9 publications

(2 citation statements)

References 20 publications

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“…Separation factors for adjacent rare earths extracted by 2-ethylhexylphenylphosphonic acid show regularities (829). Trifluoroacetylacetone gives a higher Zr-Nb separation factor than benzoyltrifluoroacetone (923).…”

Section: Extraction Systemsmentioning

confidence: 99%

Extraction

Freiser¹

1968

Anal. Chem.

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Extraction by various substituted anilides (CH3, N02, -OC2H6, Cl)Mercaptoacetic, -propionic, -succinic acids and their substituted anilides. Catechol and its 3,5-Mo(V, VI)Extraction study. Anionic Mo chelates extract Table I. (Continued) System Metal Ions Special information References DOPA Fe, Mo Extraction equil. 0, AS0, AF°. Extracted species FeA2-HA, Mo02A2 -2HA (459) DOPA Tb, Eu Extraction equil. Role of diluent (506) DOPA Ce Extraction equil. Extracted species CeA4 or at pH 1.7, Ce02A2 (1012) DOPA La, Eu, Lu, Am Extraction and aqueous chloride complex equil. Table I. (Continued) System Metal ions Special information References Valeric to lauric acids Zr Extraction depends on order of addition. Extd. species colloidal (666) Caproic acid Fe Role of pH in extraction (559, 560) Pivalic acid Cu (377) C7-C9 carboxylic acids Alkali metals Extraction equilibria K > Cs > Na > Li (648) C7-C9 carboxylic acids La, Pr, Nd, Gd Extraction decreased with deer. H-bonding of solvent (789) C7-C9 carboxylic acids Mg, Mn, Al, Fe, Th, U (646) C7-C9 carboxylic acids Zr Extraction solvents decrease C6H6N02 > CHCI3 > C6H6 > C,H,6 > Et20 > MIBK > EtOAc. Equilibration takes over week Table 1. (Continued) System Metal ions Special information References Dibutyl-Ar,Ar-diethyl carbamoylmethylene phosphonate Ce, Pm, Am Nitrate system. Extractions are about 100 X that with TBP

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Section: Extraction Systemsmentioning

confidence: 99%

Extraction

Freiser¹

1968

Anal. Chem.

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“…Lanthanide recovery from ion-adsorption ores is generally performed either as batch, in-situ, or heap leaching, following similar concepts of toxic metals removal during soil remediation procedures. Although the preferential chelation of lanthanides with various specific ligands is a well-known chemistry fact, the applications were initially limited to laboratory-scale techniques ( [37][38][39][40][41]). Various applications of chelating agents to REE extraction, especially from ion-adsorption clays, have been developed lately.…”

Section: Introduction 1backgroundmentioning

confidence: 99%

Chelation-Assisted Ion-Exchange Leaching of Rare Earths from Clay Minerals

Moldoveanu

Papangelakis

2021

Metals

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The effect of biodegradable chelating agents on the recovery of rare earth elements (REE) from clay minerals via ion-exchange leaching was investigated, with the aim of proposing a cost-effective, enhanced procedure that is environmentally benign and allows high REE recovery while reducing/eliminating ammonium sulfate usage. A processing route employing a lixiviant system consisting of simulated sea water (equivalent to about 0.5 mol/L NaCl) in conjunction with chelating agents was also explored, in order to offer a process alternative for situations with restricted access to fresh water (either due to remote location or to lower the operating costs). Screening criteria for the selection of chelating agents were established and experiments were conducted to assess the efficiency of selected reagents in terms of REE recovery. The results were compared to extraction levels obtained during conventional ion-exchange leaching procedures with ammonium sulfate and simulated sea water only. It was found that stoichiometric addition of N,N′-ethylenediaminedisuccinic acid (EDDS) and nitrilotriacetic acid-trisodium form (NTA-Na3) resulted in 10–20% increased REE extraction when compared to lixiviant only, while achieving moderate Al co-desorption and maintaining neutral pH values in the final solution.

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A systematic correlation of the properties of the f-transition metal ions

Sinha¹

1991

Structure and Bonding

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Observations on the separation factors of the rare earths with various ligands

Cited by 9 publications

References 20 publications

Extraction

Extraction

Chelation-Assisted Ion-Exchange Leaching of Rare Earths from Clay Minerals

A systematic correlation of the properties of the f-transition metal ions

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