环烷酸-N235体系萃取分离钇的研究  

Extraction and Separation of Yttrium by Naphthenic Acid-N235 System

作　　者：王增凯 刘葵 林茜颉 黄广铭 蒋卷涛 Wang Zengkai;Liu Kui;Lin Xijie;Huang Guangming;Jiang Juantao(Guangxi Key Labo-ratory of Low Carbon Energy Materials,School of Chemistry and Pharmaceutical Sciences,Guangxi Normal University,Guilin 541004,China;Institute for Advanced Materials,School of Materials Science and Engineering,Jiangsu University,Zhenjiang 212013,China)

机构地区：[1]广西低碳能源材料重点实验室,广西师范大学化学与药学学院,广西桂林541004 [2]江苏大学材料科学与工程学院,新材料研究院,江苏镇江212013

出　　处：《中国稀土学报》2023年第2期305-312,共8页Journal of the Chinese Society of Rare Earths

基　　金：广西自然科学基金项目(2017GXNSFDA198015);广西重点研发计划项目(桂科AB20297036)资助。

摘　　要：环烷酸-N235体系用于Y的萃取分离,可避免氨氮废水的产生。采用组成为20%环烷酸-35%混合醇-40%N235-5%煤油的体系萃取Y时,Y萃取率随相比的增大而增加,相比达到7∶1时,Y的单级萃取率可达95%以上;相比高于3∶1时,分相时间较长。环烷酸-N235体系从含15种稀土元素的料液中分离Y可以通过两步完成,第一步是将Y,La,Ce,Pr,Nd与中重稀土分离,第二步是将Y与La,Ce,Pr,Nd分离。串级萃取模拟计算结果表明,经过5级萃取和5级洗涤,可以实现第一步分离;再经过12级萃取和21级洗涤,可以实现第二步分离,在有机相出口获得高纯度Y(99.99%)。负载Y的环烷酸-N235萃取体系有机相可用2.5 mol·L^(-1) HCl进行反萃。Extraction of yttrium by naphthenic acid-N235 system can prevent the production of waste water containing ammonia-nitrogen.When using system of 20%naphthenic acid-35%alcohols-40%N235-5%kerosene as the extractant,the extraction efficiency of yttrium increases with the increase of the phase ratio and increases to 95%or above at the phase ratio of 7∶1.The phase separation time is quite long when the phase ratio is higher than 3∶1.The separation of yttrium from solutions containing 15 kinds of rare earth elements can be obtained via two steps.Firstly,the solution is subjected to LaCePrNdY/Sm-Lu grouping separation,and secondly,the raffinate obtained from the first step is subjected to LaCePrNd/Y separation.Results from the simulated computation using theory of counter current extraction show that the first step can be realized through five-stage extraction and five-stage scrubbing,and the second step can be realized through twelve-stage extraction and twenty one-stage scrubbing,and the high purity yttrium can be obtained at the exit of the organic phase.The yttriumloaded organic phase can be stripped with 2.5 mol·L^(-1) hydrochloric acid solution.

关 键 词：环烷酸 N235 串级萃取 钇 稀土 

分 类 号：TF845[冶金工程—有色金属冶金]