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Minerals 2017, 7(10), 182; https://doi.org/10.3390/min7100182

A Novel Eco-Friendly Vanadium Precipitation Method by Hydrothermal Hydrogen Reduction Technology

1
School of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan 430070, China
2
School of Resources and Environmental Engineering, Wuhan University of Science and Technology, Wuhan 430081, China
3
Hubei Collaborative Innovation Center for High Efficient Utilization of Vanadium Resources, Wuhan 430081, China
*
Authors to whom correspondence should be addressed.
Received: 30 August 2017 / Revised: 22 September 2017 / Accepted: 24 September 2017 / Published: 28 September 2017
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Abstract

In view of the serious pollution problems caused by the traditional vanadium precipitation process, the eco-friendly technology of hydrothermal hydrogen reduction was first applied to precipitate phase pure vanadium sesquioxide (V2O3) products from stripped pentavalent vanadium (V (V)) solution extracted from vanadium-bearing shale. Thermodynamic analysis demonstrate the method of hydrothermal hydrogen reduction is feasible for precipitating V2O3 from V (V) solution at a suitable pH range, and the reduction should better be carried out at a lower pH under the pH range in which V2O3 can exist stably. The V2O3 products of 99.92% in purity and a high vanadium precipitation percentage of 99.25% were achieved under a facile reaction condition of initial solution pH of 6, reaction temperature of 523 K, H2 partial pressure of 4 MPa and reaction time of 2 h. Based on the analysis of XRD and FE-SEM with EDS for the precipitation products obtained at serial reaction times, the phase transformation mechanism was summarized to serial reductions with the phase transformation of HxVyOz(2zx−5y)− → NaV2O5 → VO2(H2O)0.5 → VOOH → V2O3. Compared with the two-step traditional method of precipitating vanadium with ammonium salt and roast-reduction (react at above 773 K for more than 3 h) for preparing V2O3, this method only experiences one-step reduction under a green atmosphere of H2 gas with a lower reaction temperature of 523 K and a shorter reaction time of 2h. Therefore, this method for vanadium precipitation is characterized by being eco-friendly, having a short process and being low-energy consumption, which has great significance for the sustainable development of vanadium industry. View Full-Text
Keywords: vanadium precipitation; V2O3; hydrogen reduction; hydrothermal; vanadium-bearing shale vanadium precipitation; V2O3; hydrogen reduction; hydrothermal; vanadium-bearing shale
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Zhang, G.; Zhang, Y.; Bao, S.; Huang, J.; Zhang, L. A Novel Eco-Friendly Vanadium Precipitation Method by Hydrothermal Hydrogen Reduction Technology. Minerals 2017, 7, 182.

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