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
• 来源期刊: 稀土学报（英文版）
• 年，卷（期）: 2022,（4）
• 所属期刊栏目: CHEMISTRY AND HYDROMETALLURGY
• 页码范围: 676-686
• 页数: 11页
• 语种: 英文

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)reticu-lated 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 per-formance.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 KLa of Pr(Ⅲ)and Ce(Ⅲ)are 0.519 and 0.378 s-1 at the residence timeτ of 3.6 s,respectively,which reach the high level of microchannel reactors and are better than con-ventional 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.