PROCESS FOR RECOVERING URANIUM FROM ACID URANIUM-BEARING LEACH SOLUTIONS BY ION EXCHANGE

The invention relates to a process for recovering uranium from acid uranium-bearing leach solutions. According to the invention, the process consists in selectively adsorbing the uranium from acid uranium-bearing leach solution on a highly basic anionic ion exchange resin; after the adsorption, the...

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Hauptverfasser: GEORGESCU PETRE DAN, R EDULESCU ROZALIA, AURELIAN FLORIAN, FILIP GHEORGHE, PAN URU EUGENIA
Format: Patent
Sprache:eng ; rum
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Zusammenfassung:The invention relates to a process for recovering uranium from acid uranium-bearing leach solutions. According to the invention, the process consists in selectively adsorbing the uranium from acid uranium-bearing leach solution on a highly basic anionic ion exchange resin; after the adsorption, the uranium is eluated with a solution of 0.1N HNO3 and 0.9 N NH4 and the resulting uranium-bearing eluate is carbonated with sodium carbonate, at a pH = 8.5, when the impurifying metals precipitate as hydroxides and the uranium from the purified uranium-bearing eluate is precipitated with NaOH as sodium diuranate, which is filtered, washed and dried to a content of H2O lower than 5%. Invenţia se referă la un procedeu de recuperare a uraniului din leşii uranifere acide. Procedeul conform invenţiei constă în aceea că uraniul din leşii uranifere acide este adsorbit selectiv, pe răşini schimbătoare de ioni, anionice, puternic bazice, după adsorbţie este eluat cu o soluţie de HNO3 0,1 N şi NH4NO3 0,9 N, iar eluatul uranifer rezultat este carbonatat cu carbonat de sodiu, la pH 8,5, când are loc precipitarea sub formă de hidroxizi a metalelor impurificatoare şi uraniul din eluatul uranifer purificat este precipitat cu NaOH sub formă de diuranat de sodiu, care este filtrat, spălat şi uscat până la un conţinut de H2O mai mic de 5%.