钙含量对含钒页岩钠盐焙烧—水浸提钒影响研究-有色金属冶炼部分.DOC

钙含量对含钒页岩钠盐焙烧—水浸提钒的影响 胡杨甲，张一敏2 (1.北京矿冶研究总院 矿物加工科学与技术国家重点验室，北京 10 2.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，武汉 410083） 摘要：研究了钙含量对高钙云母型含钒页岩钠盐焙烧提钒水浸率的影响。结果表明矿石中含量对钒水浸率影响很大。反应物CaCO3V2O5的摩尔比大于21时，850焙烧时主要产物为Ca3V2O8Ca2V2O7，从而导致钒水浸率偏低。热力学计算表明钒酸钙盐在酸性溶液中比碱性溶液中溶解度大，因此对于高钙云母型含钒页岩可以考虑采用钠盐焙烧—水浸—酸浸钠盐焙烧—酸浸的方法提高钒的回收率。除钙焙烧样通过稀酸浸出，最终获得了73%的钒浸出率。 关键词：钒；含钒页岩；石煤；钙；焙烧Effect of Calcium Content on Vanadium Extraction from Black Shale by Sodium Roasting-Water Leaching HU Yang-jia1, ZHANG Yi-min2 (1. State Key Laboratory of Mineral Processing, Beijing General Research Institute of Mining Metallurgy, Beijing 100160, China; 2. Hubei Provincial Engineering Technology Research Center of High Efficient Cleaning Utilization for Shale Vanadium; College of Resource and Environment Engineering, Wuhan University of Science and Technology, Wuhan 410083, China) 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. Key words: vanadium; vanadium-bearing black shale; stone coal; calcium; roasting 含钒页岩（俗称含钒石煤）占我国钒资源总储量的87%（以V2O5计）[1]。因此加强对含钒页岩资源的开发和利用研究非常重要。 国内从含钒页岩中提钒的工艺主要分为两大类，即火法湿法工艺和纯湿法工艺。国外由于受资源限制，研究甚少[-9]。我国含钒页岩大部分属于未风化淋滤的云母型含钒页岩，钒以类质同象形式赋存在云母类矿物晶格中，结构非常稳定。矿石中