摘要
近年来,随着新能源、电子材料及化学工业的快速发展,高纯五氧化二钒(V2O5)的市场需求大幅增长,尤其是在全钒液流电池(VRFB)中的应用.全钒液流电池作为一种新型绿色环保的大规模储能系统,具有能量存储独立、功率与容量可调、安全高效等优点,其核心成分钒电解液的主要原料即为高纯五氧化二钒.综述了从含钒溶液中制备储能用高纯五氧化二钒的研究进展,重点探讨了不同原料(如钒渣、钒钛磁铁矿、废催化剂、石煤等)的提钒工艺及其主要杂质.针对含钒溶液中的杂质(如Fe、Al、Si、P、Cr等),详细介绍了化学沉淀法、溶剂萃取法和离子交换法等净化除杂方法及其优缺点.未来,研发更高效、绿色、低成本的高纯钒制备技术,解决现有技术的瓶颈,如降低化学沉淀法的化学品消耗、优化溶剂萃取法的废水处理和萃取剂回收、提升离子交换法树脂性能及降低再生成本,将对储能用高纯钒的发展至关重要,推动储能领域的进一步进步.未来发展趋势包括:开发低毒、高效、易回收的新型萃取剂;优化离子交换过程以减少洗脱剂消耗;通过精确调控沉淀条件实现高纯钒的直接沉淀;发展连续化、智能化反应与分离集成系统;强化工艺内物料的循环利用,推动钒电池等储能技术的可持续发展.
Abstract
Vanadium,a rare metal known for its unique physical and chemical properties,plays a significant role in industries such as steel,chemicals,and energy.In recent years,the demand for high-purity vanadium pentoxide(V2O5)has surged,driven by advancements in new energy,electronic materials,and the chemical industry,particularly in its application in all-vanadium redox flow batteries(VRFB).VRFB,a novel green and environmentally friendly large-scale energy storage system,offers advantages such as independent energy storage,adjustable power and capacity,and high safety.The core component of VRFB,the vanadium electrolyte,primarily relies on high-purity vanadium pentoxide as its raw material.The research progress in producing high-purity vanadium pentoxide from vanadium-containing solutions for energy storage applications was reviewed.It focuses on the vanadium extraction processes from various raw materials,including vanadium slag,vanadium-titanium magnetite,spent catalysts,and stone coal,as well as the main impurities present in these materials.To address impurities such as Fe,Al,Si,P,and Cr in vanadium-containing solutions,detailed purification methods,including chemical precipitation,solvent extraction,and ion exchange,as well as their advantages and disadvantages,were discussed.Chemical precipitation involves adding specific precipitants to form insoluble precipitates with impurity ions,thereby separating them from vanadium.Solvent extraction utilizes the difference in distribution coefficients between organic and aqueous phases to transfer vanadium from the aqueous phase to the organic phase.Ion exchange employs resin to adsorb vanadium ions,which are then eluted to achieve separation and purification.The studies show that chemical precipitation is effective in removing impurities such as Si,P,and Cr,but it consumes large amounts of chemicals,posing economic and environmental challenges.Solvent extraction is efficient in separating vanadium from elements like Mn and Fe,but the treatment of organic wastewater and the recovery of extractants remain technical difficulties.Ion exchange performs well in separating vanadium from P,Fe,and Cr,but the adsorption capacity of resins is significantly affected by temperature and pH value,and the regeneration cost is high.Future trends include:developing low-toxicity,high-efficiency,and recyclable extractants;optimizing ion exchange process to minimize eluent consumption;achieving direct high-purity vanadium precipitation via precise process control;advancing continuous,intelligent reaction-separation systems;and enhancing material recycling to support sustainable vanadium-based energy storage.These innovations aim to overcome current limitations in chemical consumption,wastewater treatment,and resin regeneration,driving greener and more cost-effective production of high-purity V2O5 for next-generation energy storage applications.
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