A group separation and purification of Sm, Eu and Gd from Egyptian beach monazite mineral using solvent extraction

Binary extraction of lanthanides (III) nitrates with carboxylates and dialkylphosphates of secondary and tertiary amines

“…According to the binary extraction mechanism, the extraction of lanthanide salts with amine carboxylates can be described by the heterogeneous reaction equation (2) where R х NH 4 -x B is di-or trioctylammonium carboxylate.…”

“…Precipitating, extraction and ion exchange chromatography methods are used for preparative separation and purification of lanthanides [1]. In various methods, the separation factors of a single stage of separation process for the lanthanide pairs neighboring in the periodic table does not exceed ten and is often close to one [1,2]. Extraction is the most effective and selective process.…”

Solvent Extraction of Light Rare Earths from Acidic Medium by Di-(2-ethylhexyl) Phosphoric Acid in Kerosene

“…However, the family of acidic extractants obtained as by-products of phosphorics (D2EHPA), phosphonic (EHEHPA, HEHEHP, P507, PC88A) and phosphinic acids (Cyanex 272, P229) seems to be more effective in extracting REE from aqueous solutions (Abdeltawab et al 2002;Li et al 2006). D2EHPA (di-2-ethylhexyl phosphoric acid) is among the fi rst and the most widely investigated extractant in separation of REE (Antico et al 1996;Basualto et al 2013;Huang et al 2008;Rabie 2007;Sato 1989;Thakur 2000).…”

Solvent extraction separation of La from chloride solution containing Pr and Nd with Cyanex 272

“…Among the several recent SX approaches, the use of organophosphorous extractants (Huang et al, 2008;Rabie, 2007;Thakur, 2000) and phosphine oxide (Reddy et al, 1998;Shaibu et al, 2006) has been highlighted. D2EHPA, PC 88A (Gupta and Krishnamurthy, 2004), and Cyanex 272 (Komatsu and Freiser, 1989;Li and Freiser, 1986) efficiently extract rare earths from different aqueous medium solutions, but the separation factor between rare earths is not high enough to yield a pure solution of each component.…”