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Metals 2017, 7(9), 360; doi:10.3390/met7090360

Preparation of Vanadium Nitride Using a Thermally Processed Precursor with Coating Structure

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1,2,3,4,* , 1,2,3
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1
College of Resource and Environment Engineering, Wuhan University of Science and Technology, Wuhan 430081, China
2
Hubei Collaborative Innovation Center of High Efficient Utilization for Vanadium Resources, Wuhan 430081, China
3
Hubei Provincial Engineering Technology Research Center of High Efficient Cleaning Utilization for Shale Vanadium Resource, Wuhan 430081, China
4
College of Resource and Environment Engineering, Wuhan University of Technology, Wuhan 430070, China
*
Author to whom correspondence should be addressed.
Received: 30 July 2017 / Revised: 22 August 2017 / Accepted: 5 September 2017 / Published: 11 September 2017
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Abstract

A new effective method is proposed to prepare vanadium nitride (VN) via carbothermal reduction–nitridation (CRN) of the precursor, obtained by adding carbon black (C) to the stripping solution during the vanadium recovery from black shale. VN was successfully prepared at a low temperature of 1150 °C for only 1 h with a C/V2O5 mass ratio of 0.30 in N2 atmosphere, but a temperature of 1300–1500 °C is required for several hours in the traditional CRN method. The low synthesis temperature and short period for the preparation of VN was due to the vanadium-coated carbon structure of the precursor, which enlarged the contact area between reactants significantly and provided more homogeneous chemical composition. In addition, the simultaneous direct reduction and indirect reduction of the interphase caused by the coating structure obviously accelerated the reaction. The phase evolution of the precursor was as follows: (NH4)2V6O16·1.5H2O → V2O5 → V6O13 → VO2 → V4O7 → V2O3 → VC → VN. The precursor converted to V6O13 and VO2 completely after being calcined at 550 °C, indicating that the pre-reduction of V2O5 in the traditional CRN method can be omitted. This method combined the synthesis of VN with the vanadium extraction creatively, having the advantages of simple reaction conditions, low cost and short processing time. View Full-Text
Keywords: vanadium nitride; precursor; phase evolution; nitrogen content; black shale vanadium nitride; precursor; phase evolution; nitrogen content; black shale
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MDPI and ACS Style

Han, J.; Zhang, Y.; Liu, T.; Huang, J.; Xue, N.; Hu, P. Preparation of Vanadium Nitride Using a Thermally Processed Precursor with Coating Structure. Metals 2017, 7, 360.

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