关键词: 石煤提钒富液, 高纯五氧化二钒, 富钒液起始硫酸浓度, 氧化剂氯酸钠, 红饼溶解硫酸溶液浓度, 沉钒终点pH

Abstract: In view of drawbacks in traditional process of preparing high purity V₂O₅ with vanadium extraction from stone coal,a new process for directly preparing high purity V₂O₅ is proposed based on the original metallurgical grade Vanadium production process as follows: adjusting the concentration of sulfuric acid in vanadium-rich liquid,oxidizing the liquid to reach potential more than 1 000 mV with sodium chlorate solution,obtaining a red filtered cake (red cake),dissolving the red cake with sulfuric acid solution,adding aqueous ammonia to realize vanadium precipitation under controlled final pH,obtaining high purity V₂O₅ by filtering,drying and roasting,and preparing metallurgical grade vanadium from the oxidized filter according to the original vanadium precipitation process.Taking vanadiumrich liquid from Shaanxi Wuzhou Mining Co.,Ltd-as a case,laboratory tests showed that the key parameters to prepare high purity vanadium includes the initial sulfuric acid concentration in vanadium-rich liquid 1.5 mol/L,the concentration of sulfuric acid solution to dissolve the red cake 1.5 mol/L,and the final pH=0.8 with ammonia adding-Based on laboratory tests results,industrial tests in Wuzhou Mining Co.,Ltd-were performed to obtain high-purity vanadium and metallurgical-grade vanadium of 99.7 and 98 respectively.

Key words: Vanadiumrich liquid extracted from stone coal, High purity V2O5, Initial sulfuric acid concentration in vanadium liquid, Oxidant sodium chlorate, Concentration of sulfuric acid solution to dissolve red cake, Final pH of vanadium precipitation