{"title":"Rational Technology for Separation of Rare Earth Elements Isolated from Monazite","authors":"A. V. Val’kov, E. A. Anan’eva, V. I. Petrov","doi":"10.1134/S0040579524700702","DOIUrl":null,"url":null,"abstract":"<div><p>The behavior of actinium-227 and actinium-228 in the life cycle of monazite processing is considered. The recommended system for separation of actinium-227 and actinium-228 is 90–100% TBP–300–350 g/dm<sup>3</sup> of Ln(NO<sub>3</sub>)<sub>3</sub>–0.1–0.5 mol/dm<sup>3</sup> of HNO<sub>3</sub>. The process is combined: actinium-227 and actinium-228 are removed simultaneously with purification from rare earth impurities, iron, aluminum, calcium, and phosphate ions occurs. If monazite does not contain uranium, it is recommended to hold the rare earth concentrate (solution or carbonates) after separation of thorium for 1–2 days. A process flow chart for separation of the sum of REEs isolated from monazite is proposed, with production of didymium, lanthanum–cerium concentrate, and yttrium REE concentrate.</p></div>","PeriodicalId":798,"journal":{"name":"Theoretical Foundations of Chemical Engineering","volume":"58 2","pages":"425 - 431"},"PeriodicalIF":0.7000,"publicationDate":"2024-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Theoretical Foundations of Chemical Engineering","FirstCategoryId":"5","ListUrlMain":"https://link.springer.com/article/10.1134/S0040579524700702","RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"ENGINEERING, CHEMICAL","Score":null,"Total":0}
引用次数: 0
Abstract
The behavior of actinium-227 and actinium-228 in the life cycle of monazite processing is considered. The recommended system for separation of actinium-227 and actinium-228 is 90–100% TBP–300–350 g/dm3 of Ln(NO3)3–0.1–0.5 mol/dm3 of HNO3. The process is combined: actinium-227 and actinium-228 are removed simultaneously with purification from rare earth impurities, iron, aluminum, calcium, and phosphate ions occurs. If monazite does not contain uranium, it is recommended to hold the rare earth concentrate (solution or carbonates) after separation of thorium for 1–2 days. A process flow chart for separation of the sum of REEs isolated from monazite is proposed, with production of didymium, lanthanum–cerium concentrate, and yttrium REE concentrate.
期刊介绍：
Theoretical Foundations of Chemical Engineering is a comprehensive journal covering all aspects of theoretical and applied research in chemical engineering, including transport phenomena; surface phenomena; processes of mixture separation; theory and methods of chemical reactor design; combined processes and multifunctional reactors; hydromechanic, thermal, diffusion, and chemical processes and apparatus, membrane processes and reactors; biotechnology; dispersed systems; nanotechnologies; process intensification; information modeling and analysis; energy- and resource-saving processes; environmentally clean processes and technologies.
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