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Minerals 2016, 6(3), 75; https://doi.org/10.3390/min6030075

Selective Leaching of Vanadium from Roasted Stone Coal by Dilute Sulfuric Acid Dephosphorization-Two-Stage Pressure Acid Leaching

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College of Resources and Environmental Engineering, Wuhan University of Science and Technology, Wuhan 430081, China
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Hubei Provincial Engineering Technology Research Center of High Efficient Cleaning Utilization for Shale Vanadium Resource, Wuhan 430081, China
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Hubei Provincial Collaborative Innovation Center for High Efficient Utilization of Vanadium Resources, Wuhan 430081, China
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Author to whom correspondence should be addressed.
Academic Editor: William Skinner
Received: 8 May 2016 / Revised: 25 June 2016 / Accepted: 8 July 2016 / Published: 21 July 2016
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Abstract

A novel staged leaching process has been reported in this paper to selectively extract vanadium from roasted stone coal and the mechanisms have been clarified. Results showed that the leaching efficiency of V, Al, P and Fe was 80.46%, 12.24%, 0.67% and 3.12%, respectively, under the optimum dilute sulfuric acid dephosphorization (DSAD)-two-stage pressure acid leaching (PAL) conditions. The efficient separation of V from Fe, Al and P was realized. As apatite could be leached more easily than mica, the apatite could completely react with sulfuric acid, while the mica had almost no change in the DSAD process, which was the key aspect in realizing the effective separation of V from P. Similarly, the hydrolyzation of Fe and Al could be initiated more easily than that of V by decreasing the residual acid of leachate. The alunite and iron-sulphate compound generated in the first-stage PAL process resulted in the effective separation of V from Fe and Al. View Full-Text
Keywords: pressure acid leaching; stone coal; thermodynamics; vanadium; selective leaching pressure acid leaching; stone coal; thermodynamics; vanadium; selective leaching
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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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Huang, J.; Zhang, Y.; Huang, J.; Liu, T.; Cai, Z.; Xue, N. Selective Leaching of Vanadium from Roasted Stone Coal by Dilute Sulfuric Acid Dephosphorization-Two-Stage Pressure Acid Leaching. Minerals 2016, 6, 75.

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