Sulfur dioxide (SO2) is a type of the main air pollutants in sintering flue gas. SO2 has received extensive attentions because it is a precursor of environmental acidification. According to the influential parameters of the sintering process and the material composition of sintering mixture, the formation process of SO2 during the rise of sinter temperature from 25 °C to 1000 °C has been studied in this paper. And the results show that 66.67 sulfur in the sintering mixture is released in the form of SO2 into the sintering flue gas under different sinter temperatures. Producing reactions of SO2 tend to be drastic when the sinter temperature rises up to 700 °C. The mass of SO2 produced during the temperature rises from 700 °C to 1000 °C occupies 91.66 of the total SO2 in the sintering process. Analysis on material balance suggests that concentration of SO2 released from the sintering is related not only with the sinter temperature, but also with the content of S in the coke and the alkalinity of sintering mixture. The rising coke content promotes the release of SO2, and the peak concentration of SO2 reaches 229 mg/m3 when the coke content is 7. CaCO3 in sintering mixture has a suppression effect on SO2, and the peak concentration of SO2 is only 112 mg/m3 when the alkalinity of sintering mixture is 2.0.
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