Study on Roasting-Acid Leaching Process for Vanadium Extraction from Low-Grade Stone Coal Vanadium Ore AITranslate

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

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In view of the difficulty in vanadium extraction from stone coal vanadium ores due to their complex structure,this study aims to achieve deep extraction and efficient recovery of vanadium resources.Taking a stone coal vanadium ore from a certain area in Shaanxi Province as the research object,and based on the analysis of the occurrence state of vanadium in the ore and its process transformation,a combined process of barium salt roasting-acid leaching-solvent extraction-ammonium salt vanadium precipitation was employed for vanadium extraction.Through parameter optimization,an optimal vanadium extraction effect was achieved.The research results show that the optimized process parameters are as follows:In the roasting stage,the grinding fineness is 60% passing 0.074 mm,the barium sulfate dosage is 5%,the roasting temperature is 900℃,and the roasting time is 4 h.In the leaching stage,the sulfuric acid dosage is 5%,the liquid-solid ratio is 1.5∶1,the leaching temperature is room temperature,and the leaching time is 2 h.Under these conditions,the V₂O₅leaching rate reaches over 82%.The vanadium-containing leachate is oxidized by sodium chlorate and then extracted using a 7.5%N235+5%sec-octanol+82.5% sulfonated kerosene extraction system,with an vanadium extraction rate of 99.45%.The obtained loaded organic phase is stripped with 10% sodium carbonate solution,and the vanadium stripping rate reaches 99.71%.After impurity removal with calcium chloride,vanadium precipitation with ammonium chloride,and calcination,the stripping solution yields a vanadium pentoxide product with a purity of 99.32%,which meets the requirements of grade 99 in the industry standard(YB/T 5304—2017).This study provides a technical path and data reference for vanadium extraction from similar stone coal vanadium ores.