Carbon dioxide could be utilized as a weak oxidant and a kind of coolant to oxidize elements, meanwhile, helping control the temperature during the converter vanadium extraction process. However, the optimum content of CO₂ and the cooling effect of CO₂ at low content have not been reported. In this study, experimental research based on the influence of different CO₂ contents from 0% to 25% injected to the vanadium-containing hot metal was carried out, as well as contrast experiments of O₂-N₂ mixed blowing. The results indicated that the optimum content of CO₂ was 15%. Under the optimum condition, the oxidation of [C] was the lowest and the oxidation rate of [V] was 96.9%, while the temperature was also lower than the O₂-N₂ mixed blowing. This paper provide a potential property for utilizing CO₂ during the converter vanadium extraction process.