U_(3)O_(8)的硝酸连续溶解试验研究  

Continuous Dissolution of U_(3)O_(8)in Nitric Acid

作　　者：康绍辉[1] 牛玉清[1] 李大炳[1] 周志全[1] 张永明[1] 曹令华[1] 任燕[1] 王皓[1] 曹笑豪 叶开凯 张佳宇 KANG Shaohui;NIU Yuqing;LI Dabing;ZHOU Zhiquan;ZHANG Yongming;CAO Linghua;REN Yan;WANG Hao;CAO Xiaohao;YE Kaikai;ZHANG Jiayu(Beijing Research Institute of Chemical Engineering and Metallergy,CNNC,Beijing 101149,China)

机构地区：[1]核工业北京化工冶金研究院,北京101149

出　　处：《湿法冶金》2024年第6期640-645,共6页Hydrometallurgy of China

基　　金：国家自然科学基金资助项目(U2267225);国家重点研发计划项目(2023YFC2907802);中核集团领创科研项目(CNNC-JCYJ202211)。

摘　　要：针对U_(3)O_(8)原料粒级分布呈“两头多”现象,提出了细颗粒U_(3)O_(8)快速溶解、大颗粒U_(3)O_(8)设备底部持续溶解的工艺思路,设计了一种槽式连续溶解装置。通过微型、小型和扩大试验验证了该槽式溶解装置的合理性、U_(3)O_(8)硝酸连续溶解工艺的可行性,以及对不同原料的适用性。结果表明:在硝酸浓度6 mol/L、溶解温度约60℃、停留时间40 min条件下,溶解液中铀平衡质量浓度在350~400 g/L之间,不同来源的U_(3)O_(8)原料均能得到有效溶解。In view of the"bimodal"particle size distribution phenomenon of U_(3)O_(8)raw materials,the process concept of rapid dissolution of fine U_(3)O_(8)and continuous dissolution of large U_(3)O_(8)at the bottom of the equipment was put forward,and a tank-type continuous dissolution device was designed.The rationality of the proposed tank-type dissolution device,the feasibility of the continuous dissolution process of U_(3)O_(8)in nitric acid,and its applicability to different raw materials were verified through micro,small-scale,and pilot tests.The results show that under the conditions of the nitric acid concentration of 6 mol/L,dissolution temperature of approximately 60℃,and residence time of 40 minutes,U_(3)O_(8)from different sources can be effectively dissolved,the uranium mass concentration in the dissolution solution is 350~400 g/L.

关 键 词：八氧化三铀 连续溶解 硝酸 铀酰 

分 类 号：TL212[核科学技术—核燃料循环与材料]