8th International Congress on Science and Technology of Ironmaking - ICSTI 2018

The flue gas circulation sintering process can not only realize the comprehensive utilization of resources, but also can realize clean production which by recycling sintering flue gas to conduct iron ore sintering and significantly reducing the flue gas processing in the terminal treatment. The flue gas directly recycling use in sinter production will affect the sinter properties, because the flue gas oxygen content and temperature in the bellows are different. In order to make rational use of the sintering flue gas, it can be divided into high temperature flue gas, high pollution flue gas and comprehensive circulating flue gas according to the characteristics of sintering flue gas. In this paper, sintering cup experiments are used to study the influence law of the flue gas temperature, the oxygen content, the circulating sintering time and the carbon amount on sintering technical indexes and sintered ore metallurgical properties. The experimental results show that the reasonable amount of carbon reduction is 5% to 10% when the flue gas sintering in the circulation temperature is 423K to 523K℃. To guarantee the sinter properties, the oxygen content of flue gas should not be less than 18% and the reasonable time of flue gas circulation sintering about 6 min when the circulation flue gas is 473K and the carbon content is 4.05%.