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Minerals 2018, 8(3), 113; https://doi.org/10.3390/min8030113

Evaluation of Microwave Intensified Vanadium Bearing-High Carbonaceous Shale Acid Extraction Process

1,2
,
1,2,3,* , 1,2
and
1,2
1
Hubei Provincial Collaborative Innovation Center for High Efficient Utilization of Vanadium Resource, Wuhan 430081, China
2
Hubei Provincial Engineering Technology Research Center of High Efficient Cleaning Utilization for Shale Vanadium Resource, Wuhan 430081, China
3
School of Resources and Environmental Engineering, Wuhan University of Technology, 122 Luoshi Road, Wuhan 430070, China
*
Author to whom correspondence should be addressed.
Received: 11 January 2018 / Revised: 2 February 2018 / Accepted: 5 March 2018 / Published: 9 March 2018
(This article belongs to the Special Issue Towards Sustainability in Extractive Metallurgy)
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Abstract

The microwave assisted leaching of the vanadium bearing-high carbonaceous shale process was investigated using surface response methodology (RSM) based on Box–Behnken design (BBD). The effect of important factors such as CaF2 usage, H2SO4 concentration, leaching time and microwave power, as well as the interactive coefficients, the signification of the model and factors were analyzed. With the condition of 9.8 wt % CaF2, 23.0 vol % H2SO4, 170.6 min and 350 W, the actual values of vanadium (V) leaching efficiency in microwave heating (MH) and conventional heating (CH) were 85.43% and 79.64%, which agreed well with the predicted values. Meanwhile, the influence order of the factors in MH and CH was CaF2 dosage > H2SO4 concentration > leaching time. Microwave was an efficacious impetus for V extraction, but the microwave power itself was not a significant factor when the temperature of leaching system was high enough. The further characterization of mineral components before and after leaching confirmed that the prior dissolving of muscovite and pyrite in MH was intensified, while both minerals were in fine grains and filled with black carbon. The selective heating of carbon and pyrite sequenced the large temperature gradient between solids and liquids, which accelerated the dissolving reaction of muscovite with CaF2 present in MH condition. View Full-Text
Keywords: carbonaceous shale; vanadium extraction; microwave heating; response surface methodology analysis carbonaceous shale; vanadium extraction; microwave heating; response surface methodology analysis
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Wang, J.; Zhang, Y.; Liu, T.; Huang, J. Evaluation of Microwave Intensified Vanadium Bearing-High Carbonaceous Shale Acid Extraction Process. Minerals 2018, 8, 113.

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