Abstract
With the improvement of CO2 emission requirements of steel enterprises, it is significant to explore new technologies to reduce CO2 emission. In this work, the closed recycle method of vent gas from the reduction processes was proposed to research on the utilization of CO2 in vent gas and the reduction of the iron ore with different particle size was investigated in detail in this process. The results suggest that CO2 could be converted into CO completely in the closed recycle system and the reduction degree of the iron ore can reach up to 90%. Considering in average reaction rate and grinding cost, iron ore in diameter of 4–10 mm was the optimal size. This study may provide important perspectives for the application of the closed recycle of vent gas and the reduction of industrial CO2 emission.
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