C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
53/209
C22B 60/02 (2006.01) C01B 15/047 (2006.01)
Patent
CA 1076365
FMC 1635 ABSTRACT: A process of recovering uranium values as uranium peroxide from an aqueous uranyl solution containing dissolved vana- dium and sodium impurities by treating the uranyl solution with hydrogen peroxide in an amount sufficient to have an excess of at least 0.5 parts H2O2 per part of vanadium (V2O5) above the stoichiometric amount required to form the uranium peroxide, the hydrogen peroxide treatment being car- ried out in three sequential phases consisting of I, a pre- cipitation phase in which the hydrogen peroxide is added to the uranyl solution to precipitate the uranium peroxide and the pH of the reaction medium maintained in the range of 2.5 to 5.5 for a period of from about 1 to 60 minutes after the hydrogen peroxide addition; II, a digestion phase in which the pH of the reaction medium is maintained in the range of 3.0 to 7.0 for a period of about 5 to 180 minutes and III, a final phase in which the pH of the reaction medium is maintained in the range of 4.0 to 7.0 for a period of about 1 to 60 minutes during which time the uranium peroxide is separated from the reaction solution containing the dis- solved vanadium and sodium impurities. The excess hydrogen peroxide is maintained during the entire treatment up until the uranium peroxide is separated from the reaction medium.
250693
Caropreso Frank E.
Kreuz Donald F.
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