Extraction of vanadium from vanadium slag by high pressure oxidative acid leaching
来源期刊：International Journal of Minerals Metallurgy and Materials2015年第1期
论文作者：Guo-quan Zhang Ting-an Zhang Guo-zhi Lü Ying Zhang Yan Liu Zhuo-lin Liu
文章页码：21 - 26
摘 要：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·L-1,a leaching temperature 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 vanadium reaches 97.69%.
Guo-quan Zhang，Ting-an Zhang，Guo-zhi Lü，Ying Zhang，Yan Liu，Zhuo-lin Liu
Key Laboratory of Ecological Utilization of Multi-Metal Intergrown Ores of the Ministry of Education,School of Materials and Metallurgy,Northeastern University
摘 要：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·L-1,a leaching temperature 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 vanadium reaches 97.69%.
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