通过热重分析实验、XRD和金相分析等实验手段,对铁矿石球团在600～1 000℃ 温度范围内的H2还原过程进行了探讨,并采用未反应核模型对铁矿石球团的H2还原动力学进行分析.结果表明:H2还原铁矿石球团的过程具有明显的阶段性特征,还原速率整体上随着温度的升高而增大,然而在700 ～900℃温度范围内出现了还原速率的迟滞现象.在本实验条件下,整个还原过程的速率由外扩散、内扩散和化学反应混合控制,反应的表观活化能为39.49 kJ/mol.
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