Solvent extraction of Ce(Ⅲ) and Pr(Ⅲ) with P507 using SiC foam as a static mixer  

作　　者：Ye Zhang Yong Gao Peng Wang Duo Na Zhenming Yang Jinsong Zhang 

机构地区：[1]School of Materials Science and Engineering,Northeastern University,Shenyang 110819,China [2]Shenyang National Laboratory for Materials Science,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China

出　　处：《Journal of Rare Earths》2022年第4期676-686,I0006,共12页稀土学报（英文版）

基　　金：Project supported by the National Key Research and Development Program of China (2017YFB0310405)。

摘　　要：Extraction reactor is a major research area of interest within the field of rare earths extraction and separation.SiC foam offers excellent material characteristics as well as three-dimensional(3-D) reticulated structure;however,very little research has been carried out on its application in extraction reactor so far.In this work,a static mixer reactor based on SiC foam was designed and demonstrated to extract and separate Ce(Ⅲ) and Pr(Ⅲ) from nitric acid media by using 2-ethylhexyl phosphoric acid mono-2-ethylhexyl ester(P507) as extractant.The structure-performance relationship between SiC foam and extraction performance was studied by experiment combined with computational fluid dynamics(CFD)simulation.The experiment data are in good agreement with the simulation results.Contrast experiment by using a Kenics mixer was carried out,and SiC foam shows better extraction and mass transfer performance.Using the optimal structural SiC foam(pore size D=2.3 mm,open porosity ε=85%,foam length L=80 mm),high extraction efficiency η(Pr(Ⅲ):94.6%,Ce(Ⅲ):88.5%) and separation factor β(2.27) between Ce(Ⅲ) and Pr(Ⅲ) is achieved at a high total throughput of 200 mL/min.Besides,overall volumetric mass transfer coefficient K_(L)a of Pr(Ⅲ) and Ce(Ⅲ) are 0.519 and 0.378 s^(−1) at the residence time τ of 3.6 s,respectively,which reach the high level of microchannel reactors and are better than conventional extractors and other static mixers.SiC foam is found to be applicable as a static mixer for efficient and high-throughput extraction and separation of rare earths.

关 键 词：SiC foam EXTRACTION Static mixer Simulation Rare earths 

分 类 号：TQ133.3[化学工程—无机化工]