Use of complex-forming agents for extraction separation of cerium group of rare-earth elements in systems with neutral organophosphorus extractants

Selective separation of yttrium by CA-100 in the presence of a complexing agent

“…However, the separation and purification of Y from HRE impurities is known to be difficult because of their similar chemical and physical properties. For the effective separation of rare-earth metals, various modification of the extraction system have been reported, one of the most effective methods for improving the separation is to modify the aqueous phase by adding EDTA, DTPA or HEDTA [3][4][5][6] . In the presence of the water-soluble complexing agent, a * Corresponding author.…”

Selective Extraction of Y from a Ho/Y/Er Mixture by Liquid−Liquid Extraction in the Presence of a Water-Soluble Complexing Agent

“…The separation of the metals should thus be improved when the above conditions can be properly combined in the extraction system. Several reports concern extraction systems for the separation of rare-earth metals in the presence of a water-soluble complexing agent such as ethylenediaminetetraacetic acid (EDTA) and diethylenetriaminepentaacetic acid (DTPA), both at the equilibrium − and at the nonequilibrium states. , Matsuyama et al synthesized new hydrophilic chelating polymers, based on the introduction of EDTA to a water-soluble poly(allylamine), and investigated the effect of the addition of the chelating polymers on the separation for the Y/Er system . Matsuyama et al have also investigated the extraction mechanism for rare-earth metals in the presence of DTPA …”