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Open AccessArticle

Recovery of Vanadium from H2SO4-HF Acidic Leaching Solution of Black Shale by Solvent Extraction and Precipitation

Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China
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Academic Editor: Corby G. Anderson
Metals 2016, 6(3), 63; https://doi.org/10.3390/met6030063
Received: 21 January 2016 / Revised: 28 February 2016 / Accepted: 3 March 2016 / Published: 14 March 2016
(This article belongs to the Special Issue Recycling of Metals)
The recovery of vanadium from sulfuric and hydrofluoric mixed acid solutions generated by the direct leaching of black shale was investigated using solvent extraction and precipitation methods. The process consisted of reduction, solvent extraction, and stripping, followed by precipitation and calcination to yield vanadium pentoxide. The influence of various operating parameters on the extraction and recovery of vanadium was studied. Vanadium (IV) was selectively extracted using a mixture of 10% (v/v) di(2-ethylhexyl)phosphoric acid and 5% (v/v) tri-n-butylphosphate in sulfonated kerosene. Using six extraction and five stripping stages, the extraction efficiency for vanadium was 96.7% and the stripping efficiency was 99.7%. V2O5 with a purity of 99.52% was obtained by oxidation of the loaded strip solution and precipitation of ammonium polyvanadate at pH 1.8 to 2.2, followed by calcination of the dried precipitate at 550 °C for 2 h. It was concluded that the combination of solvent extraction and precipitation is an efficient method for the recovery of vanadium from a multi-element leach solution generated from black shale. View Full-Text
Keywords: solvent extraction; vanadium precipitation; black shale; vanadium solvent extraction; vanadium precipitation; black shale; vanadium
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Li, X.; Wei, C.; Deng, Z.; Li, C.; Fan, G.; Li, M.; Huang, H. Recovery of Vanadium from H2SO4-HF Acidic Leaching Solution of Black Shale by Solvent Extraction and Precipitation. Metals 2016, 6, 63.

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