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A novel method to extract V3+ from iron vanadate spinel minerals by one leaching step
Hydrometallurgy ( IF 4.7 ) Pub Date : 2020-12-01 , DOI: 10.1016/j.hydromet.2020.105517
Xuexin Chen , Baijun Yan

Abstract To alleviate the energy consumption and the effluent of traditional oxidizing roasting and leaching process of vanadium extraction, a novel method to extract the vanadium from iron vanadate spinel mineral (Fe3-xVxO4) by one leaching step was developed. In this method, the Fe powder was found as a synergist of oxalic acid to leach the vanadium as [V(C2O4)3]3− complex under hydrothermal condition. With the synergy of Fe powder, the leaching efficiency of V3+ ions from iron vanadate spinel concentrate was enhanced significantly, and simultaneously Fe3+ ions present as impurity in the pregnant leachate were eliminated effectively by forming FeC2O4·2H2O precipitate. Using the most suitable conditions, the leaching efficiency of vanadium can reach 95%, reducing Fe3+ to less than 100 mg/L. Furthermore, FeC2H2O4·2H2O with 98% purity could be obtained as a by-product by washing the filtered cake.

中文翻译:

一种一步浸出钒酸铁尖晶石矿物中V3+的新方法

摘要 为降低传统氧化焙烧浸提提钒工艺的能耗和出水问题,开发了一种从钒酸铁尖晶石矿物(Fe3-xVxO4)中一步浸提提钒的新方法。在该方法中,铁粉被发现作为草酸的增效剂,在水热条件下以 [V(C2O4)3]3- 络合物的形式浸出钒。在Fe粉的协同作用下,钒酸铁尖晶石精矿中V3+离子的浸出效率显着提高,同时通过形成FeC2O4·2H2O沉淀有效去除富浸出液中作为杂质存在的Fe3+离子。在最合适的条件下,钒的浸出效率可达95%,将Fe3+降至100mg/L以下。此外,
更新日期:2020-12-01
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