Selective recovery of uranium from Ca-Mg uranates by chlorination

JOURNAL OF NUCLEAR MATERIALS

卷:490

Article

Pomiro, Federico J.¹  Gaviria, Juan P.^1,2  Quinteros, Raul D.¹  Bohe, Ana E.^1,2,3 

[1] Comis Nacl Energia Atom, Ctr Atom Bariloche, Dept Fisicoquim & Control Calidad, Complejo Tecnol Pilcaniyeu,Ave Bustillo 9500, RA-8400 San Carlos De Bariloche, Rio Negro, Argentina

[2] Consejo Nacl Invest Cient & Tecn CONICET, Buenos Aires, DF, Argentina

[3] Univ Nacl Comahue, Ctr Reg Univ Bariloche, Quintral 1250, RA-8400 San Carlos De Bariloche, Rio Negro, Argentina

关键词: Uranium;    Recovery;    Uranate;    U-Ca-Mg;    Chlorination;    U3O8;   

DOI  :  10.1016/j.jnucmat.2017.04.014

来源: Elsevier

【 摘 要 】

A chlorination process is proposed for the uranium extraction and separation using Calcium-Magnesium uranates such as starting reactants which were obtained by precipitation from uranyl nitrate solutions with calcium hydroxide. The study is based on thermodynamic and reaction analysis using chlorine gas as chlorination agent. The results showed that the chlorination reaction of Ca uranate is more feasible to occur than the Mg uranate. The products obtained after chlorination reactions were washed with deionized water to remove the chlorides produced and analyzed. The XRD patterns of the washed products indicated that the chlorination between 400 and 500 degrees C result in a single phase of calcium uranate (CaUO4) as reaction product. The formation of U3O8 and MgU3O10 was observed at temperatures between 600 degrees C and 700 degrees C for 8 hs. The optimal conditions to recover uranium were 31 h(-1) of chlorine and 10 hs of reaction at 700 degrees C being U3O8 the single uranium product obtained. (C) 2017 Elsevier B.V. All rights reserved.

【 授权许可】

Free