摘要
为实现从低浓度稀土溶液中高效富集稀土,通过动态吸附-解吸试验,研究了转型TP207树脂吸附稀土的规律。系统考察了离子交换线速度、吸附液体积、初始pH值、铝离子对树脂吸附稀土容量的影响,以及解吸液体积对稀土解吸率的影响。结果表明:在稀土浓度为1.65 g·L^(-1),离子交换线速度为3 cm·min^(-1),吸附液体积为7.50 L,初始pH值为3.46的条件下,TP207树脂对稀土吸附量Q_(n1)=0.18 g·g^(-1);稀土溶液中铝和稀土存在竞争吸附,当Al^(3+)浓度为0.35 g·L^(-1)时,TP207树脂对稀土吸附量Q_(n2)降为0.11 g·g^(-1);采用5%的稀HCl对饱和树脂进行解吸,在解吸液体积为0.525 L时,稀土解吸率可达99.45%;树脂吸附稀土过程属于阳离子交换反应,符合Langmuir等温吸附模型,为单分子层吸附,树脂中C=O的O原子和C-N的N原子均参与配位反应。
In order to realize the high efficiency enrichment of rare earth from low concentration rare earth solu⁃tion,dynamic adsorption and desorption tests were carried out to study the adsorption rules of rare earth by transformed TP207 resin.The effects of linear velocity of ion exchange,absorption liquid volume,initial pH value and aluminum ion on the capacity of rare earth adsorption,and the effects of desorption liquid volume on the desorption rate of rare earth have been systematically investigated.The results showed that under the condi⁃tions of rare earth concentration of 1.65 g·L^(-1)and linear velocity of ion exchange of 3 cm·min^(-1),the absorption liquid volume was 7.5 L,and initial pH value of 3.46,the adsorption capacity of rare earth(Q_(n1))in TP207 res⁃in was 0.18 g·g^(-1).There was a competitive adsorption between aluminum and rare earth in rare earth solution.When the concentration of Al ions in the rare earth solution was 0.35 g·L^(-1),the rare earth adsorption capacity(Q_(n2))of TP207 resin decreased to 0.11 g·g^(-1).The saturated resin was desorbed with 5%hydrochloric acid,and when the desorption liquid volume was 0.525 L,the desorption rate of rare earth could reach 99.45%.The resin adsorption process of rare earth is a cation exchange reaction,accord with the Langmuir isothermal adsorption model,belong to monolayer adsorption,and the oxygen atom of C=O and nitrogen atom of C-N in the resin are involved in the coordination reaction.
作者
胡小洣
周洁英
伍莺
赖兰萍
张积锴
陈冬英
Hu Xiaomi;Zhou Jieying;Wu Ying;Lai Lanping;Zhang Jikai;Chen Dongying(Ganzhou Nonfer-rous Metallurgy Research Institute Co.,Ltd.,Ganzhou 341000,China)
出处
《中国稀土学报》
EI
CAS
CSCD
北大核心
2022年第4期633-640,共8页
Journal of the Chinese Society of Rare Earths
基金
江西省重点研发计划项目(20202BBGL73116)资助。
关键词
TP207树脂
吸附容量
吸附
解吸
稀土
TP207 resin
adsorption capacity
adsorption
desorption
rare earths
