摘要
离子型稀土矿提取分离所得萃余液中有机萃取剂的深度去除和回收难度较大,树脂作为一种新型吸附材料,在有机萃取剂的深度去除和回收方面具有较大潜力。本文采用DA201-C型大孔吸附树脂对萃余液中P507萃取剂进行静态吸附,仅需吸附10 min即可达到96%以上的萃取剂吸附率;该树脂对P507萃取剂的饱和吸附量为1.26 g·g^(-1),吸附机制为物理吸附。分别采用NaOH溶液、乙醇溶液对吸附P507萃取剂后的树脂进行静态解吸,乙醇溶液的解吸率可达86.2%,优于NaOH溶液的解吸率(最高为57.6%);乙醇溶液的解吸机制为物理解吸,而NaOH溶液的解吸机制为化学解吸。P507萃取剂吸附、解吸过程不会破坏树脂的骨架结构,验证了树脂的稳定性。以上研究为离子型稀土矿低浓度稀土萃取富集、稀土萃取分离产生的萃余液中P507萃取剂的高效去除和回收提供了指导。
It is difficult to deeply remove and recover the organic extractant in the raffinate obtained by the extraction and separation of ion-adsorption rare earth ore. As a new adsorption material,the resin has great potential in depth removal and recovery of organic extractant from the raffinate. The P507 extractant in the raffinate was statically adsorbed by the DA201-C microporous adsorption resin in this work. The results show that more than 96% of the P507 extractant was adsorbed by resin within 10 min;the saturated adsorption capacity of the resin is 1.26 g·g,and the adsorption mechanism is physical adsorption. NaOH solution and ethanol solution were used for the static desorption of the P507-adsorbed resin,respectively. The desorption rate of the P507 extractant using ethanol solution was 86.2%,which was higher than those using NaOH(the highest 57.6%);The desorption mechanism using ethanol solution is physical desorption,while that using NaOH solution is chemical desorption. The skeleton structure of the resin was not damaged during the adsorption and desorption process of the P507 extractant,which proved a good stability of the resin. The above studies provide guidance for efficient removal and recovery of P507 extractant from raffinate obtained by the extraction and enrichment processes of low-concentration rare earths of ion-adsorption rare earth ore,and the rare earths extraction and separation processes.
作者
刘德鹏
张蕴哲
郑旭东
齐少雷
赵龙胜
冯宗玉
Liu Depeng;Zhang Yunzhe;Zheng Xudong;Qi Shaolei;Zhao Longsheng;Feng Zongyu(National Engineering Research Center for Rare Earth,Grinm Group Co.,Ltd.,Grirem Advanced Materials Co.,Ltd.,Beijing 100088,China;Rare Earth Functional Materials(Xiong'an)Innovation Center Co.,Ltd.,Xiong'an 071700,China)
出处
《中国稀土学报》
EI
CAS
CSCD
北大核心
2022年第6期1090-1097,共8页
Journal of the Chinese Society of Rare Earths
基金
国家自然科学基金项目(91962211,51804273)
国家重点研发计划项目(2021YFC2902200,2018YFC1801803)
福建清源创新实验室项目(00122004)资助。
关键词
中重稀土
萃余液
树脂
P507萃取剂
吸附
mid-heavy rare earths
raffinate
resin
P507 extractant
adsorption
