高浓度稀土浸出液的协同分步萃取试验研究  

Enrichment of high concentration rare earth leaching solution

作　　者：李洪博 韩东 张津榕 姜雪 葛富彪 胡振光 LI Hongbo;HAN Dong;ZHANG Jinrong;JIANG Xue;GE Fubiao;HU Zhenguang(School of Chemical and Biological Engineering,Guilin University of Technology,Guilin 541004,China)

机构地区：[1]桂林理工大学化学与生物工程学院,广西桂林541004

出　　处：《中国有色冶金》2023年第6期53-59,共7页China Nonferrous Metallurgy

基　　金：广西科技计划项目(RZ2200000063)资助。

摘　　要：P204和P507常用作萃取剂用于稀土浸出液的萃取,采用单一萃取剂萃取难以有效分离、富集稀土,本文利用P507萃取高浓度稀土溶液时对轻稀土萃取能力较弱而P204萃取能力强的特点,创新性提出采用P507与TBP协同萃取中重稀土,然后采用P204与TBP协同萃取轻稀土的工艺,并进行了萃取、反萃取试验,得出以下结论。在试验原料条件下,采用二级萃取工艺,当相比A/O=10/1、pH值4.0、常温、P507体积分数35%、TBP体积分数5%时,P507+TBP对中、重稀土的萃取率较佳,均能达到90%以上;采用二级萃取工艺,在P204体积分数35%、TBP体积分数5%、相比A/O=15/1、常温、萃取时间5 min的条件下,P204+TBP对轻稀土的萃取率达到97%。P507与P204的负载有机相在适当的酸性条件下,P507负载有机相经二级逆流反萃、P204负载有机相经三级逆流反萃后均可得到高浓度的稀土富集液,浓度值达到直接进入萃取分离线的要求。该研究在低能耗、低试刘消耗条件下实现了稀土提取利用及初步分离,所生产的氯化稀土溶液可以直接进入稀土分离厂进行分离提纯,为高浓度稀土回收分离提供了参考。P204 and P507 are commonly used as extractants for the extraction of rare earth leaching solution.It is difficult to effectively separate and enrich rare earths by single extractant.In this paper,the characteristics of weak extraction ability of P507 and strong extraction ability of P204 for light rare earth were used in the extraction of high concentration rare earth solution.P507 and TBP were innovatively used to extract medium and heavy rare earths,and then P204 and TBP were used to extract light rare earths.The extraction and back extraction experiments were carried out,and the following conclusions are drawn.Under the conditions of the test raw materials,the two-stage extraction process was adopted.When the phase ratio A/O=10/1,pH 4.0,room temperature,P507 volume fraction 35%,TBP volume fraction 5%,the extraction rate of P507 for medium and heavy rare earths is better,which can reach more than 90%.The extraction rate of light rare earth by P204 reached 97%under the conditions of P204 volume fraction of 35%,TBP volume fraction of 5%,phase ratio A/O=15/1,room temperature and extraction time of 5 min.Under appropriate acidic conditions,P507 loaded organic phase after two countercurrent stripping,P204 loaded organic phase after three countercurrent stripping can get high concentration of rare earth enrichment solution,and the concentration value can meet the requirements of direct entry into the extraction separation line.This study provides a reference for the recovery and separation of high concentration rare earth.

关 键 词：稀土浸出液 协同萃取 中、重稀土 轻稀土 P507 P204 TBP 反萃 

分 类 号：TF845[冶金工程—有色金属冶金]