Abstract Effect of three iron ore types (limonite, hematite and oolitic hematite) on the thermal behaviour and reaction kinetics of coal-iron ore briquettes during coking was investigated using the thermal analysis method. The carbonized briquettes were characterized using the XRD and SEM. The results showed that all three iron ores were completely reduced to Fe at the final coking stage. The addition of iron ore to the coal briquette had little influence on the gas yield, but could significantly affect the reaction rate. A synergistic effect of iron ore and coal occurred in the later reaction stage, and the initial temperature of the synergistic effect varied with the type of iron ore in coal-iron ore briquettes. The type of iron ore hardly affected the devolatilization rate of coal-iron ore briquettes, but could greatly influence the reduction rate of iron ore, subsequently the gasification rate of coal char. In addition, the better reduction ability of iron ore could more easily lead to the cracking of coke. When the iron ore was blended into the coal briquette, the reaction kinetics at the first and third reaction stage changed. The three coal-iron ore briquettes had similar weighted average apparent activation energies of 30.67–35.52 kJ/mol.

中文翻译：

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铁矿石类型对焦化过程中煤铁矿压块热行为和动力学的影响

摘要 采用热分析方法研究了三种铁矿石（褐铁矿、赤铁矿和鲕粒赤铁矿）在焦化过程中对煤铁矿压块热行为和反应动力学的影响。使用 XRD 和 SEM 表征碳化块。结果表明，所有三种铁矿石在最终焦化阶段都完全还原为 Fe。向型煤中加入铁矿石对瓦斯产率影响不大，但对反应速率有显着影响。铁矿石与煤的协同作用发生在反应后期，协同效应的起始温度随煤-铁矿石压块中铁矿石类型的不同而变化。铁矿石的种类几乎不影响煤铁矿型煤的脱挥率，但会极大地影响铁矿石的还原率，进而影响煤焦的气化率。此外，铁矿石较好的还原能力更容易导致焦炭的开裂。当铁矿石混入型煤时，第一和第三反应阶段的反应动力学发生了变化。三种煤铁矿石压块具有相似的加权平均表观活化能，为 30.67-35.52 kJ/mol。