Effect of Acid Leaching on the Vanadium Leaching Rate in Process of Vanadium Extraction Using Calcium Roasting

doi:10.12068/j.issn.1005-3026.2014.11.013

Abstract

Abstract: Sulfuric acid leaching was used to recover vanadium from calcium roasting vanadium slag. The effects of particle size， pH， leaching temperature， time， ratio of liquid to solid (L/S)， stirring speed on the leaching rate of vanadium and impurities were investigated. The results showed that the vanadium leaching rate increases slowly when the particle size is smaller than 75 μm， and it is improved by less than 3% with increasing L/S from 2∶1 to 7∶1 and the stirring speed from 100 to 500r/min. The pH value has great effect on vanadium recovery. The leaching rate of vanadium reaches over 90%， and the leaching rate of impurities， like Ca， Mn， Mg， Al， Si， P， are 10%~30% in pH range from 2 to 3. Under the optimal conditions of particle size of 9675 μm， pH of 25， temperature of 55 °C， time of 30 min， L/S of 3 and stirring speed of 500 r/min， the vanadium leaching rate is over 91%.

Key words: vanadium, vanadium slag, acid leaching, calcium roasting, vanadium extraction, vanadium leaching rate

CLC Number:

TF11131

ZHANG Juhua， ZHANG Wei， ZHANG Li， GU Songqing. Effect of Acid Leaching on the Vanadium Leaching Rate in Process of Vanadium Extraction Using Calcium Roasting[J]. Journal of Northeastern University Natural Science, 2014, 35(11): 1574-1577.

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