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




Recovery of Vanadium from H2SO4-HF Acidic Leaching Solution of Black Shale by Solvent Extraction and Precipitation - Descarga este documento en PDF. Documentación en PDF para descargar gratis. Disponible también para leer online.

Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China





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Academic Editor: Corby G. Anderson

Abstract 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 di2-ethylhexylphosphoric 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





Autor: Xingbin Li, Chang Wei * , Zhigan Deng, Cunxiong Li, Gang Fan, Minting Li and Hui Huang

Fuente: http://mdpi.com/



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