Technical Study on Vanadium Extraction from Acid Leachate of Decarbonized Slag of High-Carbon Stone Coal Using N235 AITranslate

7Shuilin Wu,Yibing Yang,Mingzi Sun,Tian Zhang,Shaozhuan Huang,Daohong Zhang,Bolong Huang,Pengfei Wang,Wenjun Zhang.Dilute Aqueous-Aprotic Electrolyte Towards Robust Zn-Ion Hybrid Supercapacitor with High Operation Voltage and Long Lifespan[J].Nano-Micro Letters,2024,16(9):1-12.

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Chinese Library Classification Number:TF841.3[冶金工程—有色金属冶金]

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Using the leachate of the decarbonized slag of high-carbon stone coal after blank roasting and acid leaching as raw material,the vanadium extraction and stripping processes were studied using extractant N235 and stripping agent Na₂CO₃.The results show that under the optimal extraction conditions of an extraction solution pH of 2.3,an organic phase composition of 15%N235+5%sec-octanol+80%sulfonated kerosene,a phase ratio(O/A)of 1∶4,an extraction time of 4 mintues,an oxidant sodium chlorate dosage being 0.05 times the mass of V₂O_5,and five extraction stages,the vanadium extraction rate reaches 99%.The optimal stripping parameters include a Na₂CO₃solution concentration of 8%,a stripping phase ratio(O/A)of 4∶1,a stripping time of 10 minutes,and three stripping stages,allowing the stripping rate of vanadium to reach 99.50%.Under these optimal extraction and stripping conditions,the concentration of vanadium is enriched from 4.25 g/L to 68.50 g/L,with a pH value of 8.5 without neutralization.The final product V₂O₅obtained by further precipitation and calcination of vanadium-rich liquid has a grade of 98.95%and low impurity content,meeting the requirements of 98-level V₂O_5inindustry standard of YB/T 5304—2017.