IMPROVED ION EXCHANGE METHOD FOR SEPARATING RARE EARTHS IN MACRO QUANTITIES¹

Separations of Yttrium and Some Rare Earths by Liquid-Liquid Extraction

“…1. Separation of the yttrium and rare earths obtained from the ion-exchange column tailings (a) Introduction,, In the ion-exchange method employed by Spedding (30)(31)(32) for producing pure rare earth salts, an yttrlum-lanthanlde chloride mixture constitutes the charge for the resin columns. The rare earths and yttrium pass ISC-695 throqgU t^he column as a series of separate bands which are collected individually with some overlapping.…”

“…In the same year Ketelle and Boyd (28) and Tompkins, Khym and Cohn (29) employed ion-exchange resin columns for separation of selected mixtures of rare earth salts. Since then many other papers on rare earth separation by ion-exchange columns have been written (30)(31)(32)(33)(34)(35)» In general this technique entails elutriating the rare earth cnloride mixture through an ion-exchange resin, such as amberlite, with citric acid. The order of lanthanlde elution was found to be that of decreasing atomic number while yttrium ISC-695 appeared in the gadolinium-dysprosium region.…”

Chromatographic Separations

“…The efficiency and convenience of chromatographic separations in relation to those obtainable by other methods vary greatly with the field of investigation. Applied to some substances, such as the inorganic ions (70,112,113,132) and the amino acids from various natural sources (35,36,37,84,90,115,116), chromatographic analysis has often contributed little more than a convenient confirmation of the results obtained by the conventional methods of analysis. In other fields, as with the polyene cornpounds, each new application of the chromatographic technique has revealed many new compounds that had escaped detection or isolation by other methods (124,149,150).…”

The separation of some inorganic compounds by liquid-liquid extraction

“…In the same year Ketelle and Boyd (173) and Tompkins, Kymn and Cohn (17^) employed ion-exchange resin columns for separation of selected mixtures of rare earth salts. Since then many other papers on rare earth separation by ion-exchange columns have been written (175)(176)(177)(178)(179)(180). In general this technique entails elutriating the rare earth chloride mixture through an ion-exchange resin, such as amberlite, with citric acid.…”

“…Separation of the yttrium and rare earths obtained from the ion-exchange column tailings (a) Introduction. In the ion-exchange method employed by Spedding(175)(176)(177) for producing pure rare earth salts an yttrium-lenthanide chloride mixture constitutes the charge for the resin columns. The rare earths and yttrium pass through the column as a series of separate bands which are collected individually with some overlapping.…”