摘要
传统的稀土元素分离提取工艺常采用单一的酸性磷酸酯类萃取剂,如使用常见的P507、P204等萃取剂来萃取稀土元素,需要先进行皂化预处理,皂化反应会产生污染性、刺激性严重的浓氨水,并产生氨氮废水及其他废水,采用这种方法会对环境造成严重污染。本实验采用P507-N235双溶剂萃取体系,以稀土铈、镨为主要萃取元素,研究对萃取稀土元素造成影响的因素,如相比、料液浓度、料液pH、震荡时间等。本实验利用两种萃取剂的不同特性进行研究,以P507来萃取稀土元素,以N235来萃取产生的H+。经实验结果表明,P507-N235双溶剂体系协同萃取可以实现无皂化分离稀土元素,避免了实验过程中皂化反应的发生,以此来达到减轻环境污染的目的。
Traditional rare earth element separation and extraction processes often use a single acidic phosphate extractant.For example,common P507,P204 and other extractants are used to extract rare earth elements,which requires saponification pretreatment.The large amount of saponification reaction consumes a lot and causes pollution and irritation.Severe concentrated ammonia water,and produce ammonia nitrogen wastewater and other wastewater,using this method will cause serious pollution to the environment.This experiment uses the P507-N235 dual-solvent extraction system,with rare earth cerium and praseodymium as the main extraction elements,and studies the factors that affect the extraction of rare earth elements,such as comparison,material liquid concentration,material liquid pH,shock time,etc.This experiment uses the characteristics of the two extractants to extract rare earth elements with P507 and H ions with N235.The experimental results show that the P507-N235 two-solvent system synergistic extraction can realize the non-saponification separation of rare earth elements,avoiding the occurrence of saponification reactions during the experiment,so as to achieve the effect of reducing environmental pollution.
作者
马子玉
孙志敏
MA Ziyu;SUN Zhimin(Engineering College of Changchun Normal University,Changchun 130000,Jilin,China)
出处
《四川冶金》
CAS
2021年第1期10-13,共4页
Sichuan Metallurgy
基金
2020年国家级大学生创新创业训练计划项目(G20201020505)。
关键词
稀土
萃取
非皂化
P507
N235
rare earth
extraction
non-saponification
2-ethyihexylphosphoric acid mono-2-ethylhexyl ester
tcioctylamine
