Journal ArticleDOI
Extraction behavior and simulation of rare earths in phosphonic acid systems
TLDR
In this article, the authors derived the total and individual effects of rare earth (RE) concentrations on the separation factor in the HEHEHP-isoparaffin system, including the distribution of rare-earth concentrations in both the aqueous and the organic phases.Abstract:
In this work, equilibrium data in the (Sm-Gd)Cl3-HCl-H2O-1 M saponified and nonsaponified HEHEHP–isoparaffin system were determined. The total and individual effects of rare earth (RE) concentrations on the separation factor were obtained. Based on the equilibrium data, five mathematical models describing the extraction of Sm and Gd under equilibrium conditions were developed. The models cover wide ranges of various parameters such as the total RE concentration in equilibrated aqueous phase from 0.045 to 0.6 M; acidity in equilibrated aqueous phase from 0.09 to 0.65 M; and mole fraction of Sm from 0.008 to 0.991 with small average relative errors( <3.5%). These models describe the extraction behavior of Sm and Gd, including the distribution of rare-earth concentrations in both the aqueous and the organic phases, the effects of acidity, RE concentration, and the mole fraction of Sm in aqueous phase and the RE concentration in the organic phase. A solvent extraction simulation and experiment were performed ...read more
Citations
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Journal ArticleDOI
Selection of solvent extraction reagent for the separation of europium(III) and gadolinium(III)
TL;DR: In this paper, the authors identify suitable conditions for the separation of europium/gadolinium mixture, with a high Gd content, into a phase of high-purity Gd and a Eu-enriched mixture.
Journal ArticleDOI
Studies on solvent extraction of Dy(III) and separation possibilities of rare earths using PC-88A from phosphoric acid solutions
Radhika Surampally,Nagaphani Kumar Batchu,Lakshmi Kantam Mannepalli,Ramachandra Reddy Bontha +3 more
TL;DR: In this article, the effect of phase ratio was studied with a mixture of elements; three stages were needed for the separation of Lu++Yb from Dy+Tb at an A/O ratio of 2.5:1 and 1:1 at 0.6 and 1.6
Journal ArticleDOI
Effect of chain length of alkane-1-hydroxy-1, 1′-methyldiphosphonic acids on the iron (iii) liquid–liquid extraction
TL;DR: In this article, a tentative assignment for the shifts of those two ligands and their specific complexes with iron (III) was proposed, and a spectroscopic analysis has showed that coordination of iron(III) takes place via oxygen atoms.
Journal ArticleDOI
Rapid One-Pot Synthesis of Alkane-α,ω-Diylbisphosphonic Acids from Dihalogenoalkanes Under Microwave Irradiation
TL;DR: In this article, a one-pot, two-step synthesis of alkylenebisphosphonic acids from dihalogenoalkanes was performed under microwave irradiation.
Journal ArticleDOI
Equilibrium-Staged Separations: A Bibliography Update (1999)
TL;DR: The authors provided a useful and quick reference source to the 1999 journal literature (from the 50 most important chemical engineering journals) for researchers in this area, including distillation theory and design methods, column design data, absorption reactions, absorber design, and cooling towers.
References
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Journal ArticleDOI
Liquid-liquid extraction of rare-earth elements from aqueous acid solutions by acid organophosphorus compounds
Taichi Sato,Taichi Sato +1 more
TL;DR: In this article, the distribution of rare-earth elements between hydrochloric acid solutions and solutions of di-(2-ethylhexyl)-phosphoric acid (DEHPA) or 2-ethyl-hexyl 2-methylhexylphosphororic acid in kerosene have been investigated under different conditions.
Journal ArticleDOI
The recovery of rare earth oxides from a phosphoric acid by-product. Part 1: Leaching of rare earth values and recovery of a mixed rare earth oxide by solvent extraction
TL;DR: In this article, the development of a process for the recovery of a mixed rare earth oxide from calcium sulphate sludges obtained in the manufacture of phosphoric acid from a South African apatite ore is described.
Journal ArticleDOI
Separation of neodymium from lighter rare earths using alkyl phosphonic acid, PC 88A
TL;DR: In this article, a solvent extraction process for the production of magnet grade Nd 2 O 3 by using 20% saponified alkyl phosphonic acid, PC 88A, as an extractant is presented.
Journal ArticleDOI
The recovery of rare earth oxides from a phosphoric acid by-product. Part 2: The preparation of high-purity cerium dioxide and recovery of a heavy rare earth oxide concentrate
TL;DR: In this article, the development of a solvent-extraction process for the recovery of high-purity cerium dioxide and a heavy rare earth oxide concentrate from a mixed rare earth oxalate is described.
Journal ArticleDOI
The recovery of rare earth oxides from a phosphoric acid by-product. Part 3. The separation of the middle and light rare earth fractions and the preparation of pure europium oxide
TL;DR: In this article, the development and operation of a continuous solvent extraction process for the separation of the middle (Sm, Eu, Gd, Tb) and light rare earth fractions (La, Ce, Pr, Nd) from a nitrate feed liquor is described.