Abstract
S>Uranium has been separated and concentrated from sodium carbonate solutions of monazite sand residues using strong base ion-exchange resins, particularly amberlite IRA-400. The uranyl tricarbonate anion, (UO/sub 2/(CO/sub 3/)/sub 3/!/sup -4/, is believed to be the active species in t his exchange. The interference of anions present in monazite bonate complex was evaluated, and exchange data were obtained on a solution prepared from a typical sample of concentrates of Brazilian sand. The use of strong base exchangers in carbonate systems as a means of exhaustive removal of uranium from thorium is indicated. (auth)
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