期刊
JOM
卷 70, 期 10, 页码 1972-1976出版社
SPRINGER
DOI: 10.1007/s11837-017-2726-7
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类别
资金
- National Science Foundation of China [51474162, 51774215, 51774216]
Fluorides are widely used to improve vanadium extraction from shale in China. Sulfuric acid baking-leaching (SABL) was investigated as a means of recovering vanadium which does not require the use of fluorides and avoids the productions of harmful fluoride-containing wastewater. Various effective factors were systematically studied and the experimental results showed that 90.1% vanadium could be leached from the shale. On the basis of phase transformations and structural changes after baking the shale, a mechanism of vanadium extraction from shale via SABL was proposed. The mechanism can be described as: (1) sulfuric acid diffusion into particles; (2) the formation of concentrated sulfuric acid media in the particles after water evaporation; (3) hydroxyl groups in the muscovite were removed and transient state [SO4 (2-)] was generated; and (4) the metals in the muscovite were sulfated by active [SO4 (2-)] and the vanadium was released. Thermodynamics modeling confirmed this mechanism.
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