Co-extraction of Vanadium and Aluminum from Ferrovanadium Slag by Sulfuric Acid Roasting

Ferrovanadium slag generated from ferrovanadium production via electro-aluminothermic method contains high content of aluminum as well as vanadium with high utilization value.Based on the characters of the ferrovanadium slag,sulfuric acid roasting process was selected to extract vanadium and aluminum from the ferrovanadium slag.The effects of sulfuric acid to slag ratio,roasting temperature and time on extraction rates of vanadium and aluminum were investigated.Meanwhile,the sulfuric acid roasting mechanisms were also discussed.The results show that 72.5% of V and 68.3% of Al can be extracted from the slag at sulfuric acid to slag ratio of 1.4 mL/g,roasting temperature of 240 ℃ and roasting time of 90 min.With the advantages of high extraction efficiency and low roasting temperature,the proposed process provides a new utilization method for the ferrovanadium slag.