A new process, named NO
x reduction by the modified coke with recycling flue gas, was proposed. The coke samples loaded with K
2CO
3, CaO and CeO
2 were characterized by SEM. The effects of the recycled flue gas and the modified coke on NO
x reduction were investigated with a quartz fixed bed reactor and a sintering pot. The results showed that the extent of the contact between additives and coke was: K
2CO
3>CaO>CeO
2. In the modified coke combustion with recycling flue gas, the concentration of NO
x emission was decreased, furthermore, the NO
x reduction ratio increased with the loading amount of additives. The NO
x reduction ratios were 36.7%, 20.2% and 26.2% respectively when the loading amount of K
2CO
3, CaO and CeO
2 was 2.0%. In sintering pot tests, the coke loaded with 2.0% CeO
2 was used as fuel and the recycled flue gas, simulated by the gas mixture with 50 ppm NO, was introduced to sintering process, the NO
x reduction ratio was 38.0%, which was about 13% higher than that of the base run with recycling flue gas.
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