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Open AccessArticle

Vanadium Bioleaching Behavior by Acidithiobacillus ferrooxidans from a Vanadium-Bearing Shale

by Dunpei Wei 1,2,3, Tao Liu 1,2,3,*, Yimin Zhang 1,2,3,4, Zhenlei Cai 1,2,3, Jingtao He 1,2,3 and Chengbao Xu 1,2,3
1
School of Resources and Environment Engineering, Wuhan University of Science and Technology, Wuhan 430081, Hubei, China
2
Hubei Provincial Engineering Technology Research Center of High Efficient Cleaning Utilization for Shale Vanadium Resource, Wuhan 430081, Hubei, China
3
Hubei Collaborative Innovation Center for High Efficient Utilization of Vanadium Resources, Wuhan 430081, Hubei, China
4
School of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan 430070, Hubei, China
*
Author to whom correspondence should be addressed.
Minerals 2018, 8(1), 24; https://doi.org/10.3390/min8010024
Received: 15 November 2017 / Revised: 2 January 2018 / Accepted: 11 January 2018 / Published: 15 January 2018
(This article belongs to the Collection Bioleaching)
This study investigated bioleaching behavior of vanadium from a vanadium-bearing shale using Acidithiobacillus ferrooxidans (A. ferrooxidans). Results showed a maximum recovery of 62% vanadium in 1.2-day bioleaching, which was 22.45% higher than the controls. Then, the vanadium leaching efficiency decreased significantly, only 24% of that was obtained on the tenth day. The vanadium extraction in 1.2 days was mainly attributed to the dissolution of vanadium in free oxides of shale. Fe3+ produced by A. ferrooxidans promoted the dissolution process. X-ray diffraction (XRD) patterns of the leached residues confirmed the generation of jarosite. SEM-EDS analysis of the residues indicated that jarosite adsorbed on the shale and inhibited the further dissolution of vanadium. The relevance of V, Fe, S, O was quite good in the energy disperse X-ray spectrometry (EDS) element mapping of jarosite, and acid-washing of the jarosite resulted in 31.6% of the vanadium in the precipitates desorption, indicating that the decrease of vanadium leaching efficiency in bioleaching process was caused by both adsorption and co-precipitation with jarosite. View Full-Text
Keywords: bioleaching; vanadium-bearing shale; jarosite; Acidithiobacillus ferrooxidans bioleaching; vanadium-bearing shale; jarosite; Acidithiobacillus ferrooxidans
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Wei, D.; Liu, T.; Zhang, Y.; Cai, Z.; He, J.; Xu, C. Vanadium Bioleaching Behavior by Acidithiobacillus ferrooxidans from a Vanadium-Bearing Shale. Minerals 2018, 8, 24.

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