HNO_3氧化去除Np-Pu反萃液中的H_2C_2O_4

Removal of H_2C_2O_4 Using HNO_3 Oxidation Method

摘要: 研究了用HNO3 氧化去除TRPO流程反萃Np Pu的H2 C2 O4反萃液中H2 C2 O4的条件。 7 5mol·L-1HNO3 0. 3mol·L-1H2 C2 O4混合液于 90℃下蒸发 1 3 0h和 1 0 0℃下蒸馏回流 6h, H2 C2 O4可完全分解去除混合液中添加适量催化剂MnCO3, 于 1 0 0℃下蒸发或蒸馏回流, H2 C2 O4分解加速, 1～ 1 5h内H2 C2 O4完全分解。蒸发或蒸馏回流过程中产生的HNO2 把Np(Ⅳ )氧化为Np(Ⅴ )和Np(Ⅵ ), 95 %以上的Pu保持Pu(Ⅳ )。

Abstract: HNO 3 oxidation method for removal of H 2C 2O 4 from H 2C 2O 4 stripping solution in TRPO process is studied. 5.5～7.5 mol·L -1 HNO 3 0.30 mol·L -1 H 2C 2O 4 mixed solution is evaporated at 90 ℃ and H 2C 2O 4 can be decomposed and removed completely. After adding catalyst MnCO 3, the mixed solution is evaporated and distillated at 100 ℃,H 2C 2O 4 can be decomposed quickly. HNO 2 resulting from HNO 3 can oxidized Np(Ⅳ)to Np(Ⅴ)and Np(Ⅵ) while 95 % of Pu in the solution is as Pu(Ⅳ).