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| Effect of Calcium Content on Vanadium Extraction from Black Shale by Sodium Roasting-Water Leaching |
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Received:March 27, 2014
Revised:April 13, 2014
Accepted:April 14, 2014
Published Online:August 21, 2014
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| DOI：10.3969/j.issn.1007-7545.2014.09.010 |
| KeyWord:vanadium; vanadium-bearing black shale; stone coal; calcium; roasting |
| Author | Institution |
| Hu Yang-jia |
北京矿冶研究总院 矿物加工科学与技术国家重点实验室;武汉科技大学资源与环境工程学院 湖北省页岩钒资源高效清洁利用工程技术研究中心 |
| Zhang Yi-min |
武汉科技大学资源与环境工程学院 湖北省页岩钒资源高效清洁利用工程技术研究中心 |
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| Abstract: |
| The effect of calcium content on water leaching rate of vanadium from typical high calcium mica-type vanadium-bearing black shale stone coal by sodium roasting and water leaching was investigated. The results show that calcium content in ore exerts significant influence on water leaching rate of vanadium. The roasting products are Ca3V2O8 and Ca2V2O7 in 850 ℃ with molar ratio of CaCO3 to V2O5 of 2∶1 above, thereby, the water leaching rate of vanadium declines sharply. Products of CaV2O6, Ca2V2O7, Ca3V2O8 are more soluble in acid solutions than those in alkali solutions by calculation of thermodynamics. Therefore, technologies of sodium roasting-water leaching-acid leaching or sodium roasting-acid leaching can improve vanadium recovery for high calcium mica-type vanadium-bearing black shale. The final leaching rate of vanadium by dilute acid is 73% of roasted sample without calcium removal. |
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