Study of the Cooling Effect of CO₂ on the Temperature of Vanadium in a Converter

The influence of bottom blowing a CO₂–O₂ mixture on the bath temperature of a vanadium extraction converter was studied by using the characteristics of CO₂ with weak oxidizing. It was studied in two aspects: oxygen content and temperature. The experiments showed, when the ratio of the mixture of CO₂–O₂ was 2:8 at 1300 °C, the bottom blowing of the converter inhibited the heating up of the hot metal, thus keeping the temperature below the carbon vanadium transition temperature. At 1360 °C, the sensible heat absorption by CO₂ was 1.44 times that absorbed by O₂ per mole. Meanwhile, at 1300 °C, 20% CO₂ released the chemical heat of 13.58 kJ. So with the increase of the CO₂ ratio, the bath temperature was reduced. The research showed that the bottom blowing of a CO₂–O₂ mixture had an advantageous effect by decreasing the temperature of the vanadium extraction converter.