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Open AccessArticle

Preparation of Highly Pure Vanadyl Sulfate from Sulfate Solutions Containing Impurities of Iron and Aluminum by Solvent Extraction Using EHEHPA

by Dan Li 1,2,3, Desheng Chen 1,2,*, Guozhi Zhang 1,2,3, Hongxin Zhao 1,2, Tao Qi 1,2,*, Weijing Wang 1,2, Lina Wang 1,2 and Yahui Liu 1,2
1
National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
2
Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
3
Chemistry and Chemical Engineering College, University of Chinese Academy of Sciences, Beijing 100049, China
*
Authors to whom correspondence should be addressed.
Academic Editor: Jae-chun Lee
Metals 2017, 7(3), 106; https://doi.org/10.3390/met7030106
Received: 11 February 2017 / Revised: 17 March 2017 / Accepted: 17 March 2017 / Published: 22 March 2017
(This article belongs to the Special Issue Valuable Metal Recycling)
The preparation of highly pure vanadyl sulfate from sulfate solutions containing impurities of iron and aluminumwas investigated by solvent extraction with 2-ethylhexyl phosphoric acid mono-2-ethylhexyl ester (EHEHPA) and tri-n-butyl phosphate (TBP) as the phase modifier. The extraction and stripping conditions of vanadium (IV) and its separation from iron and aluminum were optimized. Under the optimal extraction conditions, the extraction of vanadium (IV) and iron were 68% and 53%, respectively, while only 2% aluminum was extracted in a single contact, suggesting good separation of vanadium (IV) from aluminum. Sulfuric acid solution was used for the stripping. Nearly 100% vanadium (IV) and 95% aluminum were stripped, while only 10% iron was stripped under the optimal stripping conditions in a single contact, suggesting good separation of vanadium (IV) from iron. After five stages of extraction and stripping, highly pure vanadyl sulfate containing 76.5 g/L V (IV) with the impurities of 12 mg/L Fe and 10 mg/L Al was obtained, which is suitable for the electrolyte of a vanadium redox flow battery. Organic solution was well regenerated after stripping by oxalic acid solution to remove the remaining iron. The mechanism of vanadium (IV) extraction using EHEHPA was also discussed based on the Fourier transform infrared spectroscopy (FT-IR) analysis. View Full-Text
Keywords: highly pure vanadyl sulfate; vanadium-bearing titanomagnetite; solvent extraction; EHEHPA; impurities removal highly pure vanadyl sulfate; vanadium-bearing titanomagnetite; solvent extraction; EHEHPA; impurities removal
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Li, D.; Chen, D.; Zhang, G.; Zhao, H.; Qi, T.; Wang, W.; Wang, L.; Liu, Y. Preparation of Highly Pure Vanadyl Sulfate from Sulfate Solutions Containing Impurities of Iron and Aluminum by Solvent Extraction Using EHEHPA. Metals 2017, 7, 106.

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