Flue gas recirculation has been introduced into iron ore sintering process to reduce pollutant emissions. Compared with the conventional process, the sintering indices reduce gradually with decreasing O2 content in the recirculating gas. With sufficient O2, the principle on the use of flue gas recirculation is proposed. The heat loss caused by the decrease in O2 content is compensated by 250°C gas and 0.5%CO. The flame and heat transfer fronts of the sintering bed coincide using mixed gases of no more than 6%CO2 and 8%H2O (g). A novel technology of 35.5% flue gas recirculation ratio is proposed with qualified sintering indices.
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