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Minerals 2016, 6(2), 26; https://doi.org/10.3390/min6020026

Mechanisms of Vanadium Recovery from Stone Coal by Novel BaCO3/CaO Composite Additive Roasting and Acid Leaching Technology

1,2,3,* , 1,2,3,* , 1,2,3
and
1,2,3
1
School of Resource and Environmental Engineering, Wuhan University of Science and Technology, Wuhan 430081, China
2
Hubei Provincial Engineering Technology Research Center of High Efficient Cleaning Utilization for Shale Vanadium Resource, 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.
Academic Editor: William Skinner
Received: 14 December 2015 / Revised: 22 March 2016 / Accepted: 22 March 2016 / Published: 29 March 2016
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Abstract

In this report, the vanadium recovery mechanisms by novel BaCO3/CaO composite additive roasting and acid leaching technology, including the phase transformations and the vanadium leaching kinetics, were studied. The purpose of this manuscript is to realize and improve the vanadium recovery from stone coal using BaCO3/CaO as the composite additive. The results indicated that during the composite additive BaCO3/CaO roasting process, the monoclinic crystalline structure of muscovite (K(Al,V)2[Si3AlO10](OH)2) was converted into the hexagonal crystalline structure of BaSi4O9 and the tetragonal crystalline structure of Gehlenite (Ca2Al2SiO7), which could, therefore, facilitate the release and extraction of vanadium. Vanadium in leaching residue was probably in the form of vanadate or pyrovanadate of barium and calcium, which were hardly extracted during the sulfuric acid leaching process. The vanadium leaching kinetic analysis indicated that the leaching process was controlled by the diffusion through a product layer. The apparent activation energy could be achieved as 46.51 kJ/mol. The reaction order with respect to the sulfuric acid concentration was 1.1059. The kinetic model of vanadium recovery from stone coal using novel composite additive BaCO3/CaO could be finally established. View Full-Text
Keywords: vanadium recovery; stone coal; novel composite additive; BaCO3/CaO; phase transformations; kinetics vanadium recovery; stone coal; novel composite additive; BaCO3/CaO; phase transformations; kinetics
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Cai, Z.; Zhang, Y.; Liu, T.; Huang, J. Mechanisms of Vanadium Recovery from Stone Coal by Novel BaCO3/CaO Composite Additive Roasting and Acid Leaching Technology. Minerals 2016, 6, 26.

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