HNO_3氧化去除铀反萃液中的C_2O_4^(2-)

Removal of C_2O_4^(2-) From U Stripping Solution With HNO_3 Oxidation

研究了用HNO3氧化去除TRPO流程铀的 (NH4 ) 2 CO3反萃液中C2 O4 2 - 的条件。将含铀的(NH4 ) 2 CO3反萃液调节成 0 2～ 0 8mol·L- 1H2 C2 O4 7.5～ 9.5mol·L- 1HNO3溶液 ,在 10 0℃下蒸馏回流 7h ,其中的C2 O4 2 - 被完全分解去除 ,得到UO2 (NO3) 2 NH4 NO3 溶液。蒸馏回流过程中 ,NH4 NO3部分分解 ,在该条件下操作是安全的。

The removal condition of C 2O 4 2- from U stripping solution is studied. In 7.5～9.5 mol·L -1 HNO 3, the solution with ρ (U)=3～22 g·L -1 and c (C 2O 4 2- )=0.2～0.8 mol·L -1 is distillated for 7 h at 100 ℃. The C 2O 4 2- is decomposited and removed completely, and the UO 2(NO 3) 2 NH 4NO 3 solution is resulted. In the distillation condition at 100 ℃, NH 4NO 3 is decomposited slightly and the operation is safe.