Article Sidebar

PDF
Published: 2018-03-30
Abstract Views: 118
Views PDF: 218
DOI: https://doi.org/10.53747/jnst.v8i1.83
Issue
Vol. 8 No. 1 (2018)
Section
Articles
How to Cite
Luu, X. D., Nguyen, T. T., Le, B. T., & Le Thi, M. H. (2018). Separation of Th from leachate of monazite sulphation process using amine solvent extraction. Nuclear Science and Technology, 8(1), 44-49. https://doi.org/10.53747/jnst.v8i1.83

Separation of Th from leachate of monazite sulphation process using amine solvent extraction

Luu Xuan Dinh1, Nguyen Thanh Thuy1, Le Ba Thuan1, Le Thi Mai Huong1
1 Institute for Technology of Radioactive and Rare Elements, 48 Lang Ha Str, Dong Da Dist, Hanoi

Main Article Content

Abstract

The solvent extraction is one of the most common method for separating Th from solution. Primary amine has higher selectivity for the extraction of Th(IV) than U(VI) and RE(III) in sulfate media. N1923 (a primary aliphatic amine with amino nitrogen linked to a secondary carbon consisting of branched alkyl groups in C19–23 range) is commonly used to extractTh. At room temperature using 0.1M N1923 amine as solvent in this work, the results showed thatthorium maximum extraction capacity was about 2.5g/L with concentration of sulfuric acid in the aqueous phase was 1M and for 3 minutes shaking. At room temperature for 3 minutes shaking the best conditions for scrubbing process was using the mixture of acids H2SO4 0.2M and HNO3 0.1M, result inover 75%, Th was scrubbed in the aqueous phase only 0.7%. The separation of Th from leachate of monazite sulphation process was carried out on a multistage continuous flow extraction device (12 boxes), the thorium purity was 98%. Therefore, the use of amine solvents can purify thorium from rare-earth solutions in a sulfate medium

Article Details

Keywords

Monazite, Th, solvent extraction, amine solvent

References

[1] Amaral J. C. B. S., Morais C. A., “Thorium and uranium extraction from rare earth elements in monazite sulfuric acid liquor through solvent extraction”, Minerals Engineering, 23, pp. 498-503, 2010.
[2] EskandariNasab. M, “Solvent extraction separation of uranium (VI) and thorium (IV) with neutral organophosphorus and amine ligands”, Fuel, 116, pp 595-600, 2014.
[3] Vijayalakshmi R., Mishra S. L., Singh H., Gupta C.K., “Processing of xenotime concentrate by sulphuric acid digestion and selective thorium precipitation for separation of rare earths”, Hydrometallurgy, 61, pp. 75-80, 2001.
[4] Yong Zuo, Ji Chen and Deqian Li.,”Reversed MicellarSolubilization Extraction And Separation Of Thorium (IV) From Rare Earth(III) By Primary Amine N1923 In Ionic Liquid”, Separation and Purification Technology, 63, pp 684 - 690, 2008.
[5] Zhaowu Zhu, Yoko Pranolo, Chu Yong Cheng,” Separation Of Uranium And Thorium From Rare Earths For Rare Earth Production – A Review”, Minerals Engineering, 77, pp 185-196, 2015.
[6] Phan Thi Hoang Anh, Nguyen Hoang Vu, “Separation of thorium from Thua Thien-Hue monazite by selective precipitation method”, Science Magazine, Ho Chi Minh City University of Pedagogy, 40, pp 58-6, 2012.