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Utilizing high-reactivity coke is a critical approach for low-carbon iron-making. In this study, we investigated the effect of coke reactivity on reduction behavior and non-isothermal kinetics of sinter. The results show that the mass-loss rate of the burden gradually increased with increasing coke reactivity. At 1173-1373 K, the reduction process complied with the mechanism model  F2  of second-order chemical reaction control. The integral form of  F2  is G(α)=(1–α) -1 –1, and the α is the extent of the conversion. The coke reactivity did not affect the reduction mechanism of the sinter. The apparent activation energy  E  of the reduction process without coke was 93.39 kJ/mol. As the coke CRI was 24.75%, 30.80%, 41.25%, and 45.11%, the E was 89.13 kJ/mol, 88.63 kJ/mol, 85.60 kJ/mol, and 77.27 kJ/mol, respectively. The gasification reaction of coke with high reactivity can enhance the gas-phase reduction ability of the reduction process.

Effect of coke reactivity on reduction behaviours and non-isothermal kinetics of sinter at 1173–1373 K