An ionic liquid-based synergistic extraction strategy for rare earths

2015 ◽  
Vol 17 (5) ◽  
pp. 2981-2993 ◽  
Author(s):  
Menghao Zhu ◽  
Junmei Zhao ◽  
Yingbo Li ◽  
Nada Mehio ◽  
Yuruo Qi ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Rare Earth ◽  
Physical Properties ◽  
Rare Earths ◽  
Synergistic Extraction ◽  
Extraction System ◽  
Rare Earth Nitrates ◽  
Extraction Selectivity

A sustainable IL-based synergistic extraction system for rare earth nitrates shows improved extraction selectivity and good physical properties.

Extraction Behavior of Rare Earths in Ion Liquid Extraction System Using 1-Butyl-3-Methyl-Imidazolium Hexafluorophosphate and Benzoyl Acetone

2011 ◽  
Vol 335-336 ◽  
pp. 1428-1432 ◽  
Author(s):  
Zhong Wei Pan ◽  
Chang Ma ◽  
Ying Wu Zhang ◽  
Yu Xia Huang ◽  
Xing Lin Chen ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Rare Earth ◽  
Rare Earths ◽  
Liquid Extraction ◽  
Rare Earth Ions ◽  
Extraction System ◽  
Tetraacetic Acid ◽  
Extraction Percentage ◽  
Extraction Solvent ◽  
Extraction Behavior

The extraction behavior of five rare earth ions (RE3+) was investigated in ionic liquid (IL) extraction system using 1-butyl-3-methyl-imidazolium hexafluorophosphate ionic liquid ([Bmim]PF6) as extraction solvent and benzoyl acetone (HA) as extractant. The extraction percentage of RE3+ using [Bmim]PF6 was less than 8% without HA. When sufficient HA was included in IL phase, the extraction percentage of RE3+ could be higher than 98%. The extracted species in the RE3+-[Bmim]PF6-HA system was neutral REA3 and the recovery of RE3+ extracted into [Bmim]PF6 can be achieved using the mixture of hydrazine hydrate and ethylenediamine tetraacetic acid (EDTA) as stripping agent. [Bmim]PF6 can be recycled in the experiment.

scholarly journals Recycling of rare earths from NdFeB magnets using a combined leaching/extraction system based on the acidity and thermomorphism of the ionic liquid [Hbet][Tf2N]

2015 ◽  
Vol 17 (4) ◽  
pp. 2150-2163 ◽  
Author(s):  
David Dupont ◽  
Koen Binnemans
Keyword(s):  
Ionic Liquid ◽  
Rare Earths ◽  
Extraction System ◽  
Recycling Process ◽  
Acidic Properties ◽  
Ndfeb Magnets ◽  
System P

A new recycling process was developed to recover rare earths from roasted NdFeB magnets using the thermomorphic and acidic properties of the ionic liquid [Hbet][Tf2N] to achieve a combined leaching/extraction system.

scholarly journals Liquid-liquid solvent extraction of rare earths: a crystallographic analysis.

2014 ◽  
Vol 70 (a1) ◽  
pp. C1006-C1006
Author(s):  
Jeroen Jacobs ◽  
Koen Binnemans ◽  
Luc Van Meervelt
Keyword(s):  
Crystal Structure ◽  
Ionic Liquid ◽  
Ionic Liquids ◽  
Rare Earth ◽  
Solvent Extraction ◽  
Aqueous Phase ◽  
Rare Earths ◽  
Structural Information ◽  
Side Chain ◽  
Anionic Complex

Liquid-liquid solvent extraction has become the primary research topic for separating mixtures of rare-earths. [1] Current research on this topic focuses on extraction processes involving ionic liquids as basic extracting agents. In the aqueous phase, the rare-earth is coordinated by the anionic entities of the ionic liquid, forming an anionic complex. The large organic cation of the ionic liquid neutralizes the complex (ion-pair complex) and migrates the entity to an organic phase. The choice of these agents is solely based on the calculation of thermodynamical extraction parameters, whilst structural information about these compounds is rare or even non-existent. Our research focuses on obtaining structural information via crystallography on the above-mentioned molecules and relating the interactions between anion and cation to the stability of the complexes. A difference in stability between the anionic complex and cation can give a different extractability. Different rare-earth chloride salts were dissolved in an aqueous phase, containing ionic liquids with β-diketonate anions and 1-alkyl-3-methylimidazolium cations. After the extraction, crystals of the formed compounds are grown from the organic phase and measured. Current results show us that an intermolecular non-classical C-H ... O hydrogen bond is persistent across the different molecules, whilst small interactions between the cation side chain and halogens on the β-diketonate add extra stability to the crystal structure. Structures formed with 2-thenolytrifluoroactylacetonate anions have no intention to form side chain interactions, leaving the alkyl chain of the 1-alkyl-3-methylimidazolium in a void, whilst structures formed with hexafluoroacetylactonate have strong side chain interactions, which leads to a better packing. The different solubility of both compounds can be related to the different interactions and stability in the crystal structure.

scholarly journals Corrosion Characteristics Of the Rare Earth and Yttrium Metals

CORROSION ◽  
1964 ◽  
Vol 20 (5) ◽  
pp. 145t-149t ◽  
Author(s):  
LINDA LEE ◽  
N. D. GREENE
Keyword(s):  
Weight Loss ◽  
Rare Earth ◽  
Weight Gain ◽  
Aqueous Solutions ◽  
Physical Properties ◽  
Corrosion Behavior ◽  
Rare Earths ◽  
Rare Earth Metals ◽  
Alkaline Solutions ◽  
Different Temperatures

Abstract The corrosion of rare earth metals in air, water, and aqueous solutions at different temperatures has been measured by conventional weight loss and weight gain tests. The metals oxidize slowly in air, corrode slowly in water and alkaline solutions, and are readily soluble in most acids. Correlations of corrosion behavior with the electronic and physical properties of the rare earths are discussed.

Studies on Extraction Equilibrium of Rare Earths in Ion Liquid Extraction System Using 1-Butyl-3-Methyl-Imidazolium Hexafluorophosphate and 1-Phenyl-3-Methyl-4-Benzoyl-Pyrazolone-5

2012 ◽  
Vol 602-604 ◽  
pp. 887-891 ◽  
Author(s):  
Zhong Wei Pan ◽  
Jin Huo Lin ◽  
Wen Jie Li ◽  
Tian Ci Wu ◽  
Jin Ding Pan
Keyword(s):  
Ionic Liquid ◽  
Rare Earths ◽  
Equilibrium Constants ◽  
Complete Recovery ◽  
Liquid Extraction ◽  
Rare Earth Ions ◽  
Extraction System ◽  
Extraction Equilibrium ◽  
Extraction Solvent ◽  
Separation Factors

The extraction equilibrium of four rare earth ions (REn+, n = 3 or 4) was investigated in ionic liquid (IL) extraction system using 1-butyl-3-methyl-imidazolium hexafluorophosphate ([Bmim]PF6) ionic liquid as extraction solvent and 1-phenyl-3-methyl-4-benzoyl-pyrazolone-5 (HPMBP, HP) as extractant. The extraction percentage could be higher than 99%. The extracted species in the REn+-[Bmim]PF6-HP system was neutral REPn (n = 3 or 4) and complete recovery of REn+ extracted into [Bmim]PF6 can be achieved using diluent HCl as stripping agent. [Bmim]PF6 can be recycled in the experiment. The extraction equilibrium constants and the pH1/2 values of four REs and their separation factors between adjacent rare earths were estimated and comparatively studied.

scholarly journals On the molecular heat and volume of the rare earths and their sulphates

1881 ◽  
Vol 31 (206-211) ◽  
pp. 46-51
Keyword(s):  
Rare Earth ◽  
Physical Properties ◽  
Rare Earths ◽  
Royal Academy ◽  
Rare Earth Metals ◽  
Molecular Volume ◽  
Academy Of Sciences ◽  
The Rare Earth

At the request of the Royal Academy of Sciences at Stockholm, we some years ago undertook an extended research into the physical properties of the rare earth-metals and their compounds. Having performed the laborious task of separating and purifying their oxides, we are now able to publish our first series of determinations concerning their principal properties, which chemically are of the greatest im­portance, viz., molecular heat and molecular volume.

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