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对HNO_3介质中的Np(Ⅴ)-Np(Ⅵ)电极行为进行了研究。实验表明,电解过程可逆,Np(Ⅴ)的还原有很高的超电位。在双区单级电解槽中,阴极电位700mV(S.C.E.),电解还原10分钟,可使Np(Ⅵ)定量还原成Np(Ⅴ)。在1.50mol/L HNO_3介质中,电解还原Np(Ⅵ)的半反应时间约1.5分钟。可以预见,在混合澄清槽中的镎将主要处于四价状态。介绍了研制阳阴极共区电解还原混合澄清槽的目的、设计、调试、铀酸冷运转的情况。并利用该槽进行了铀、钚、镎共存的运行试验,着重了解镎在铀、钚分离过程中的行为。实验证明,钚收率99.90—99.99%;钚中去铀分离系数3900～33000;铀、钚、酸物料衡算良好;镎在槽中的积累和内循环严重;镎在槽中主要以四价形态存在;在1B槽铀钚分离条件下,从单一产品液流(IBU或IBP)中定量回收镎是不太可能的。
The behavior of Np (Ⅴ) -Np (Ⅵ) electrode in HNO_3 medium was studied. Experiments show that the electrolysis process reversible, Np (Ⅴ) reduction has a very high potential. In a two-cell single-stage cell, Np (Ⅵ) can be quantitatively reduced to Np (Ⅴ) at a cathodic potential of 700mV (S.C.E.) for 10 minutes. In 1.50mol / L HNO_3 medium, the half-reaction time of electrolytic reduction of Np (Ⅵ) is about 1.5 minutes. It is foreseeable that 镎 in the mixing and settling tank will be mainly in the tetravalent state. The purpose, design, commissioning and uranium acid cooling operation of the anode-cathode common electrolysis reduction mixing clarification tank are introduced. The tank was used to test the coexistence of uranium, plutonium and plutonium. The experiment focused on the behavior of uranium and plutonium during the separation. Experiments show that the plutonium yield of 99.90-99.99%; plutonium uranium separation factor of 3900 ~ 33000; uranium, plutonium, acid materials, accounting for a good balance; 镎 in the tank accumulation and internal circulation is serious; 镎 in the tank mainly tetravalent Morphology is present; it is not possible to quantitatively recover 镎 from single-product streams (IBU or IBP) under the conditions of separation of 1B-U and Pu.