Application of P507 and isooctanol extraction system in recovery of scandium from simulated red mud leach solution

The current recovery technique of Sc was complicated and the chemical consumption was high. This was due to the low content of Sc in resources and the difficulty of stripping. In this research, the isooctanol was added into the 2-ethylhexyl phosphonic acid mono-2-ethylhexyl ester (P507) extraction s...

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Bibliographic Details
Published in:Journal of rare earths 2019-09, Vol.37 (9), p.1002-1008
Main Authors: Liu, Chuanying, Chen, Li, Chen, Ji, Zou, Dan, Deng, Yuefeng, Li, Deqian
Format: Article
Language:English
Subjects:
Isooctanol
Rare earths
Red mud
Scandium recovery
Solvent extraction
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Summary:The current recovery technique of Sc was complicated and the chemical consumption was high. This was due to the low content of Sc in resources and the difficulty of stripping. In this research, the isooctanol was added into the 2-ethylhexyl phosphonic acid mono-2-ethylhexyl ester (P507) extraction system to reduce the extraction and improve the stripping of Sc. The maximum stripping ratio of Sc from loaded organic phase by sulfuric acid can increase from 10% (without isooctanol) to 99% (with 15 vol% isooctanol). In the extraction test of the simulated red mud leaching liquor, the separation factors between Sc and Zr, Sc and Ti are 36 and 350, separately. At the same time, other metals are almost not extracted. The high selectivity and stripping of Sc suggest that the P507 with isooctanol extraction system can be applied in the practical Sc recovery process. The stripping of Sc from P507 by sulfuric acid is improved by the addition of isooctanol. The P507 with isooctanol extraction system also has high selectivity to Sc from other elements in the red mud. [Display omitted]
ISSN:1002-0721
2509-4963
DOI:10.1016/j.jre.2018.12.004