Research on Directly Smelting Semi-steel by Blowing CO₂ into Blast Furnace Vanadium-bearing Molten Iron

The thermodynamics analysis and experimental investigation had been conduct on the system of decarbonization and vanadium protection by blowing CO₂ to smelt vanadium-bearing hot metal.The results show that it is feasible to remove carbon and keep vanadium by CO₂ blowing.In standard state,the transformation temperature of decarbonization and vanadium protection is 1 630 K.The experimental results show that the optimum conditions are as follows: gas flow rate is 0.6 L/min,ventilation time is 80 min,smelting temperature iss 1 550 ℃,CO₂ concentration is 70%.Under these conditions the decarburization rate can reach 95.6%,and the vanadium content increases slightly..