通过高温实验与理论分析研究了铁粉矿颗粒在高温下的热分解和熔化行为,以及熔化后气体与熔融粉矿液滴之间的还原动力学.当温度高于FeO熔点且产物层中有FeO生成时,铁粉矿颗粒会出现熔化现象.还原反应前210ms伴随着剧烈的热分解反应,主要是Fe2O3分解成Fe3O4.熔化后的铁粉矿颗粒产物层是液态的FeO,颗粒中心是未反应的固态Fe3O4,还原反应发生在颗粒表面.Fe3+在产物层中的扩散是还原反应的限制性环节,通过计算得到气体与熔融铁粉矿颗粒还原反应的表观活化能约为141kJ/mol.
The melting behaviour, thermal decomposition behaviour and the reduction kinetics between the gas and the molten particle were investigated with the experiments and the theoretical analysis.It was found that melting of the iron ore particles happens when the temperature is higher than that of the melting point of FeO and when FeO is formed on the product layer of the iron ore particle.The accompanied by the thermal decomposition of Fe2O3 prior to 210ms, the reduction begins.The product layer of the molten particle is liquid FeO, while the unreacted core is solid Fe3O4.The reduction takes place on the surface of the iron ore particles.The mass transfer of Fe3+in the product layer is the reaction rate controlling step.The apparent activation energy of the gas-molten particle reduction was calculated to be 141kJ/mol.
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