种核燃料Purex后处理流程中同时去除镎、钚的铀纯化方法

• Format: Patent
• Language: Chinese
• Published: 30.11.2018
• Subjects: CHEMISTRY; CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION ORPROCESSING OF GOODS; CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATERTREATMENT OR WASTE MANAGEMENT; DECONTAMINATION ARRANGEMENTS THEREFOR; FERROUS OR NON-FERROUS ALLOYS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; METALLURGY; NUCLEAR ENGINEERING; NUCLEAR PHYSICS; NUCLEAR REACTORS; PHYSICS; PRETREATMENT OF RAW MATERIALS; PRODUCTION AND REFINING OF METALS; PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULARRADIATION OR PARTICLE BOMBARDMENT; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; TREATMENT OF ALLOYS OR NON-FERROUS METALS

本发明属于核燃料后处理技术领域，涉及种核燃料Purex后处理流程中同时去除镎、钚的铀纯化方法。所述的铀纯化方法依次包括如下步骤，(1)蒸发浓缩预处理：将来自Purex后处理流程铀钚共去污分离循环的铀粗产品进行蒸发浓缩预处理，以将其中的Np(IV)调节至Np(V)和Np(VI)；(2)还原剂还原：将步骤(1)所得浓缩液冷却至室温后加入还原剂，以使其中的Pu(IV)和Pu(VI)还原至Pu(III)，Np(VI)还原至Np(V)；(3)有机溶剂萃取：将步骤(2)所得溶液调节酸度，在萃取器中分多级用含磷酸三丁酯的有机溶剂进行萃取，且所述的含磷酸三丁酯的有机溶剂分多股在不同萃取级加入。利用本发明的铀纯化方法，能够通过个铀纯化循环同时去除Np、Pu，获得合格的铀产品。 The invention belongs to the technical field of nuclear fuel post-treatment, and relates to a uranium purification method for simultaneously removing neptunium and plutonium in the nuclear fuel Purex post-treatment process. The uranium purification method sequentially comprises the following steps that firstly, evaporation and concentration pretreatment is conducted, a uranium rough product from the Purex post-treatment procedure uranium plutonium codecontamination separating cycle is subjected to evaporation and concentration pretreatment, accordingly, Np(IV) in the uranium rough product is adjusted to Np (V) and Np (VI); secondly, a reducing agent is adopted for reducing, a conce