The study on extraction behavior of [N1888][P507] and TRPO for heavy rare earths

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.

Download Full-text

Solid-liquid extraction behavior of trivalent rare earths by tributyl phosphate at high temperatures

Laboratory Robotics and Automation ◽

10.1002/(sici)1098-2728(1999)11:4<229::aid-lra8>3.0.co;2-# ◽

1999 ◽

Vol 11 (4) ◽

pp. 229-233

Author(s):

Su Zhao ◽

Wu Yang ◽

Jinzhang Gao

Keyword(s):

High Temperatures ◽

Rare Earths ◽

Tributyl Phosphate ◽

Liquid Extraction ◽

Extraction Behavior ◽

Solid Liquid Extraction ◽

Solid Liquid

Download Full-text

New Trident Molecule with Phosphoric Acid Functionality for Trivalent Rare Earth Extraction

Indonesian Journal of Chemistry ◽

10.22146/ijc.26880 ◽

2017 ◽

Vol 17 (3) ◽

pp. 491 ◽

Cited By ~ 3

Author(s):

Keisuke Ohto ◽

Hiromasa Murashima ◽

Hiroshi Murakami ◽

Shintaro Morisada ◽

Hidetaka Kawakita ◽

...

Keyword(s):

Rare Earth ◽

Phosphoric Acid ◽

Rare Earths ◽

Equilibrium Constants ◽

Extraction Equilibrium ◽

Ph Values ◽

Extraction Behavior ◽

Separation Factors ◽

Trivalent Rare Earth ◽

Rare Earth Extraction

Tripodal extraction reagent with three phosphoric acid groups, together with the corresponding monopodal molecule has been prepared to investigate some metals extraction behavior, in particular, trivalent rare earth elements (REEs). The tripodal reagent exhibited extremely high selectivity for metals with high valency such as Zr(IV), In(III), Lu(III), and Fe(III). Tripodal reagent also exhibited exceptionally high extraction ability compared with the corresponding monopodal one in the extraction of trivalent rare earths. The result for the stoichiometry of tripodal reagent to heavy rare earths showed the inflection point between Er (2:1 for a ligand with ion) and Tm (1:1). The extraction reactions were determined for all rare earths with both reagents. The extraction equilibrium constants (Kex), the separation factors (β), half pH values (pH1/2), difference half pH values (ΔpH1/2) for extraction of REEs with both reagents are estimated.

Download Full-text