机械活化铁氧化物的碳热还原热力学

为了从理论上揭示机械活化对铁氧化物碳热还原的影响规律，分析了机械活化铁氧化物的储能构成，并建立了铁氧化物机械力储能与碳热还原热力学之间的联系。研究结果表明：对铁氧化物碳热还原热力学产生显著影响的机械力储能形式是位错吉布斯自由能和无定形化吉布斯自由能；铁氧化物的碳热还原温度随机械力储能的增加而降低（其中Fe₂O₃的碳热还原温度降低不显著）；另外，Fe₃O₄从按照1/4Fe₃O₄+CO=3/4Fe+CO₂发生还原转为按照Fe₃O₄+CO=3FeO+CO₂发生还原的转折温度随Fe₃O₄机械力储能的增加而线性下降。

Carbothermic Reduction Thermodynamics of Mechanically Activated Iron Oxide

For the purpose of revealing the thermodynamic impact of mechanical activation on the carbothermic reduction of iron oxides, the constituent of stored energy in mechanically activated iron oxides was analyzed, and a functional link between stored energy and carbothermic reduction thermodynamics was founded.The research result showed that the forms of stored energy responsible for remarkably impacting the reduction thermodynamics are dislocation Gibbs free energy and amorphism Gibbs free energy.Carbothermic reduction temperature decreases with the increase of the stored energy for iron oxides (the decrease is not remarkable for the carbothermic reduction of Fe₂O₃).For the reduction of Fe₃O₄, the temperature for the transition of 1/4Fe₃O₄+CO=3/4Fe+CO₂ into Fe₃O₄+CO=3FeO+CO₂decreases linearly with the increase of stored energy for Fe₃O₄.