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Minerals 2018, 8(7), 294; https://doi.org/10.3390/min8070294

The Effects of Sodium Ions, Phosphorus, and Silicon on the Eco-Friendly Process of Vanadium Precipitation by Hydrothermal Hydrogen Reduction

1,2,* , 1,2,3,4,* and 1,2
1
School of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan 430070, China
2
Hubei Key laboratory of Mineral Resources Processing and Environment, Wuhan 43007, China
3
State Environmental Protection Key Laboratory of Mineral Metallurgical Resources Utilization and Pollution Control, Wuhan University of Science and Technology, Wuhan 430081, China
4
Hubei Collaborative Innovation Center for High Efficient Utilization of Vanadium Resources, Wuhan 430081, China
*
Authors to whom correspondence should be addressed.
Received: 11 May 2018 / Revised: 29 June 2018 / Accepted: 5 July 2018 / Published: 11 July 2018
(This article belongs to the Special Issue Towards Sustainability in Extractive Metallurgy)
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Abstract

The effects of sodium ions, phosphorus, and silicon on the eco-friendly process of vanadium precipitation by hydrothermal hydrogen reduction were investigated to establish the suitable concentrated solution system for this eco-friendly process. The results showed that sodium ions had no negative effects on the vanadium precipitation process. Phosphorus can reduce vanadate ion activity, and results in the decrease of vanadium precipitation percentage from 99.5% to 61.3%, as the phosphorus concentration in the feed solution increased from 0.05 g/L to 3 g/L. As a result, the aimed products of V2O3 were hard to be obtained, and the purity of the precipitates was lowered. Silicon can absorb in the form of H3Si3O7 on the surface of the precipitates, thus it was difficult for H (activity hydrogen atom) to react with the intermediate vanadium-bearing precipitates. As a result, the vanadium precipitation percentage decreased from 99.5% to 86.2% as the silicon concentration in the feed solution increased from 0.1 g/L to 3 g/L. The aimed products of V2O3 were not easy to be obtained, and only the intermediate vanadium-bearing precipitates containing sodium ions were obtained. The upper limits of the concentrations of phosphorus and silicon in the feed V (V) solution were ascertained as 0.5 g/L and 0.1 g/L, respectively. As the concentrations of phosphorus and silicon in the purified alkaline-concentrated V (V) solution extracted from vanadium-bearing shale are usually below the upper limits of the concentrations, the eco-friendly process of vanadium precipitation by hydrothermal hydrogen reduction has a great application prospect in the field of vanadium extraction from vanadium-bearing shale. View Full-Text
Keywords: vanadium precipitation; V2O3; hydrothermal hydrogen reduction; vanadium-bearing shale vanadium precipitation; V2O3; hydrothermal hydrogen reduction; vanadium-bearing shale
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Zhang, G.; Zhang, Y.; Bao, S. The Effects of Sodium Ions, Phosphorus, and Silicon on the Eco-Friendly Process of Vanadium Precipitation by Hydrothermal Hydrogen Reduction. Minerals 2018, 8, 294.

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