Extraction of vanadium from vanadium slag by high pressure oxidative acid leaching

• Published in: International journal of minerals, metallurgy and materials Vol. 22; no. 1; pp. 21 - 26
• Main Authors: Zhang, Guo-quan, Zhang, Ting-an, Lü, Guo-zhi, Zhang, Ying, Liu, Yan, Liu, Zhuo-lin
• Format: Journal Article
• Language: English
• Published: Beijing University of Science and Technology Beijing 2015; Springer Nature B.V; Key Laboratory of Ecological Utilization of Multi-Metal Intergrown 0res of the Ministry of Education, School of Materials and Metal urgy, Northeastern University, Shenyang 110819, China
• Subjects: Acid leaching; Ceramics; Characterization and Evaluation of Materials; Chemistry and Materials Science; Composites; Corrosion and Coatings; Extractive metallurgy; Fayalite; Glass; High pressure; Iron and steel making; Leaching; Materials Science; Metallic Materials; Mineralogy; Natural Materials; Phases; Residues; Slag; Slags; Spinel; Sulfuric acid; Surfaces and Interfaces; Thin Films; Tribology; Vanadium; X-ray diffraction; X-ray spectroscopy; X射线光谱法; X射线衍射法; 扫描电子显微镜; 提取; 氧化酸浸; 钒渣; 铁橄榄石; 高压氧化; mineralogy; vanadium; pressure leaching; slag; extraction; sulfuric acid
• ISSN: 1674-4799; 1869-103X
• DOI: 10.1007/s12613-015-1038-6

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 vana-dium 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·L^-1, a leaching tem-perature of 140℃, a leaching time of 50 min, a liquid-solid ratio of 10：1 mL·g^-1, and oxygen pressure at 0.2 MPa, the leaching rate of vana-dium reaches 97.69%.