伯胺N1923从离子吸附型稀土浸出液中萃取分离稀土与铝  

Extraction Separation of Rare Earth and Aluminum from Ion-Adsorbed Rare Earth Leaching Solution by Primary Amine N1923

作　　者：李翠翠 杨丽芬 王悦[1] 李鸿阳 王大山 刘艳珠[1] 周雪珍[1] 王秀峰 刘明彪 李永绣[1] Li Cuicui;Yang Lifen;Wang Yue;Li Hongyang;Wang Dashan;Liu Yanzhu;Zhou Xuezhen;Wang Xiufeng;Liu Mingbiao;Li Yongxiu(Research Center for Rare Earths and Nano/micro Functional Materials, Nanchang University, Ganzhou 330031, China;Ganzhou Qiandortg Rare Earth Ld Company, Ganzhou 344000, China)

机构地区：[1]南昌大学稀土与微纳功能材料研究中心,江西南昌330031 [2]赣州稀土集团股份有限公司,江西赣州344000

出　　处：《中国稀土学报》2019年第3期351-360,I0004,共11页Journal of the Chinese Society of Rare Earths

基　　金：国家自然科学基金项目(51274123,51864033,21261014);科技部973课题项目(2012CBA01204)资助

摘　　要：离子吸附型稀土浸出液中共存杂质铝的含量随矿床产地和浸取条件而变化,其浓度有时与稀土属于同一数量级,而铝对稀土的分离纯化过程影响严重。因此,稀土与铝的分离具有重要意义。本文研究了伯胺N1923萃取分离稀土与铝的性能,结果表明:N1923-煤油-异辛醇有机相可以从离子吸附型稀土浸出液中直接萃取稀土,而铝及其他低价金属离子留在水相;其分离系数可以达到10^5。少量进入有机相的铝继续用(NH4)2SO4溶液反洗(O/A=1∶1),使负载有机相中稀土与铝的比值大大增加,其分离系数随(NH4)2SO4浓度的升高和溶液pH的下降而增大。确定的最佳浓度和pH分别为2%和1。有机相中的稀土经3 mol·L^-1 NH4Cl溶液反萃(O/A=2∶1),可以得到浓度大纯度高的稀土溶液;采用cAl/cRE=8.443的含铝稀土浸出液,经萃取、洗涤和反萃,可以得到浓度为4.3~13.34 g·L^-1的cAl/cRE=0.0023~0.0027的稀土溶液,稀土回收率大于96%。The concentration of aluminum in the ion adsorption rare earth leachate varies with theorigin of the deposit and the leaching conditions, which sometimes is in the same magnitude as that of rare earth, and shows serious effect on the subsequent separation and purification of rare earth. Therefore, it is of great significance to separate rare earth from aluminum. The extraction separation performance of rare earth and aluminum by primary amine N1923 was studied, the results showed that N1923-kerosene-isooctanol organic phase can directly extract rare earths from the leachate of rare earth ions, while keep aluminum and other low valence metal ions remaining in aqueous phase. The separation factor reaches at around 10^5. The aluminum in extracted organic phase is backwashed with 2% ammonium sulfate and pH value of 1(O/A ratio of 1∶1), resulting in a great increase of ratio of rare earth to aluminum in the loaded organic phase. It was demonstrated that the separation factor of RE to Al increases with the increase of ammonium sulfate concentration and with the decrease of solution pH value, the optimum concentration and pH were determined to be 2% and 1, respectively. The rare earth in the organic phase was stripped by 3 mol·L^-1 ammonium chloride solution(O/A=2∶1) to obtain a rare earth solution with high purity and high concentration. Fora leachate with cAl3+/cRE3+=8.443, a rare earth solution with cAl3+/cRE3+=0.0023~0.0027 at the concentration of 4.3~13.34 g·L^-1 can be obtained via extracting with N1923, washing with ammonium sulfate solution and striping with ammonium chloride solution, and the recovery rate of rare earth is over 96%.

关 键 词：稀土 萃取分离 铝 N1923 

分 类 号：O614.33[理学—无机化学] X758[理学—化学]