Technical Study on Vanadium Extraction from Acid Leachate of Decarbonized Slag of High-Carbon Stone Coal Using N235
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 ex-traction solution pH of 2.3,an organic phase composition of 15％N235+5％sec-octanol+80％sulfon-ated 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 V2O5,and five extraction stages,the vanadium extraction rate reaches 99％.The optimal stripping parameters include a Na2CO3 solution 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 V2 O5 obtained 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 V2O5 in industry standard of YB/T 5304-2017.
high-carbon stone coaldecarbonized slagN235vanadiumextractionstrippingV2O5
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