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Minerals 2018, 8(1), 24;

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

1,2,3,* , 1,2,3,4
School of Resources and Environment Engineering, Wuhan University of Science and Technology, Wuhan 430081, Hubei, China
Hubei Provincial Engineering Technology Research Center of High Efficient Cleaning Utilization for Shale Vanadium Resource, Wuhan 430081, Hubei, China
Hubei Collaborative Innovation Center for High Efficient Utilization of Vanadium Resources, Wuhan 430081, Hubei, China
School of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan 430070, Hubei, China
Author to whom correspondence should be addressed.
Received: 15 November 2017 / Revised: 2 January 2018 / Accepted: 11 January 2018 / Published: 15 January 2018
(This article belongs to the Collection Bioleaching)
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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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