南方离子型稀土中铀和钍的放射性调查及萃取分离

发布时间：2018-04-03 04:38

  本文选题：南方离子型稀土　切入点：放射性　出处：《中国有色金属学报》2017年10期

【摘要】：针对南方离子型稀土中铀、钍的放射性水平开展了调查,并根据南方离子型稀土生产过程中放射性元素铀、钍的分布、走向规律特点,首次提出采用环烷酸萃取剂预先萃取分离浸矿原液中的铀、钍。考察料液酸度、萃取相比、萃取时间、萃取剂皂化度及萃取级数对萃取的影响规律,并对反萃实验进行研究。实验表明:REO=1.75mol/L的稀土料液,采用15%环烷酸+15%异辛醇+70%磺化煤油(体积分数)萃取剂体系,在最佳萃取条件下:料液酸度pH为1.0~3.5,萃取时间10 min,萃取相比O/A=2:1,采用边萃取边皂化方式,按6 mL/min速度加入0.6 mol/L NaOH溶液(V_(NaOH):V_(extractant)=1:100)单级铀萃取率达98.6%,钍萃取率达33.3%,负载有机相采用5 mol/L盐酸按相比(O/A)20:1三级逆流反萃,铀、钍反萃取率均达100%。
[Abstract]:The radioactive level of uranium and thorium in ionized rare earths in southern China was investigated. According to the distribution and trend characteristics of uranium and thorium in the production process of ionic rare earths in southern China,It is the first time to use naphthenic acid extractant to separate uranium and thorium from leaching solution.The effects of acidity, extraction time, saponification degree and extraction order on the extraction were investigated.The experimental results show that the rare earth feed solution of 1. 75 mol / L of 1. 75 mol / L of 1: Reo is extracted by 15% naphthenic acid 15% isooctanol 70% sulfonated kerosene (volume fraction).Under the optimum extraction conditions, the pH value of the feed solution was 1.0 ~ 3. 5, the extraction time was 10 min, and the extraction time was 10 min. Compared with O / A 2: 1, the solution was saponified while extracting.鎸，

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