The 1500 m3/year extraction method short process production vanadium electrolyte new technology demonstration line independently developed by the Process Engineering Research Institute of the Chinese Academy of Sciences has landed in Neijiang,Sichuan Province,and has achieved continuous and stable operation for three months.The vanadium electrolyte products produced by the line have been tested by enterprises,and the content of typical impurities such as iron,aluminum,chromium,sodium,etc.is far lower than the national standard first-class product level.Recently,the product has been tested and tested by multiple vanadium battery companies,all of which meet their requirements.
  Under the background of"dual carbon",China's energy supply system will gradually shift towards"new energy+energy storage".With the development of industries such as wind power and photovoltaics,the demand for all vanadium flow batteries is experiencing explosive growth due to their high safety and long cycle life advantages.However,the initial installation cost of all vanadium flow batteries is high,and large-scale commercial applications are limited.Therefore,reducing costs and increasing efficiency have become the key to accelerating the industrialization of all vanadium flow batteries.Vanadium electrolyte,as the core material of all vanadium flow batteries,accounts for over 50%of the total cost of the battery.At present,the common vanadium electrolyte preparation technologies use high-purity vanadium pentoxide(V2O5 with a purity of 99.9%)as the raw material.However,the preparation process is long,costly,and the quality is unstable.Developing short process,low-cost,and high-purity vanadium electrolyte preparation technologies has become an urgent demand in the industry.
  After more than ten years of research and development,the team led by Qi Tao,a researcher at the Institute of Process Engineering,has developed a new technology with independent intellectual property rights for the short process and low-cost preparation of vanadium electrolytes using extraction methods.This technology includes a"pre impurity removal reduction extraction oil removal"process,using vanadium slag sodium roasting leaching solution as raw material,and innovatively proposing a"pre impurity removal"synergistic"extraction"to achieve deep separation of vanadium and impurities.The prepared vanadium electrolyte product has high purity,and after enterprise testing,the impurity content is far lower than the national standard first-class product level,including iron≤20 mg/L,chromium≤5 mg/L,sodium≤10 mg/L,calcium≤5 mg/L,and aluminum≤5 mg/L.The entire process is a liquid-liquid reaction separation system,which eliminates the intermediate preparation step of high-purity V2O5 and eliminates the discharge of ammonia nitrogen wastewater,simplifying the process flow.According to enterprise calculations,the production cost has been reduced by nearly 30%compared to traditional production processes since its operation.
  At the end of 2022,the Process Engineering Institute collaborated with Sichuan Xingxin Vanadium Technology Co.,Ltd.and Hebei Zhongke Tongchuang Vanadium Titanium Technology Co.,Ltd.of Chuanwei Group to promote the validation of new technologies and the construction of a 1500 m3/year short process vanadium electrolyte preparation demonstration line.The demonstration line officially started construction in February 2023,and high-quality products were produced in October,which were tested and tested by vanadium battery enterprises such as Sichuan Weilide,Beijing Lvvanadium,and Dali Electric.We are currently preparing for the construction of a 10000 ton production line.
  The relevant technologies provide technical support for the low-cost preparation of high-purity key materials for all vanadium flow batteries,which will effectively promote the formation of the all vanadium flow battery industry chain and play an important role in building an industrial system of"vanadium raw materials+vanadium new materials+vanadium new energy".