Journal
INTERNATIONAL JOURNAL OF MINERALS METALLURGY AND MATERIALS
Volume 22, Issue 1, Pages 21-26Publisher
SPRINGER
DOI: 10.1007/s12613-015-1038-6
Keywords
extraction; vanadium; slag; pressure leaching; sulfuric acid; mineralogy
Categories
Funding
- National High Technology Research and Development Program of China [2012AA062303]
- National Natural Science Foundation of China [U1202274, 51004033, 51204040]
- Doctoral Fund Project of China [20120042110011]
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To extract vanadium in an environment friendly manner, this study focuses on the process of leaching vanadium from vanadium slag by high pressure oxidative acid leaching. Characterizations of the raw slag, mineralogy transformation, and the form of leach residues were made by X-ray diffraction, scanning electron microscopy, and energy dispersive X-ray spectroscopy. The result shows that the vanadium slag is composed of major phases of fayalite, titanomagnetite, and spinel. During the high pressure oxidative acid leaching process, the fayalite and spinel phases are gradually decomposed by sulfuric acid, causing the release of vanadium and iron in the solution. Meanwhile, unreacted silicon and titanium are enriched in the leach residues. With the initial concentration of sulfuric acid at 250 g center dot L-1, a leaching temperature of 140A degrees C, a leaching time of 50 min, a liquid-solid ratio of 10:1 mL center dot g(-1), and oxygen pressure at 0.2 MPa, the leaching rate of vanadium reaches 97.69%.
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