采用失重法,从动力学角度分析了几种不同粒径印尼海砂球团氢气还原的规律.研究表明:在试验条件下,不同粒径球团在同一温度下的反应机理基本一致;还原温度低于900℃,整个反应由两个不同的限制性环节组成,反应开始阶段由化学反应控制,之后的反应由化学反应和内扩散共同作限制性环节;还原温度在900℃及以上,反应由三个不同的限制性环节组成,反应开始阶段由化学反应控制,中间阶段由化学反应和内扩散共同作限制性环节,反应后期由内扩散作为反应的限制性环节.不论在哪一种还原温度下,粒度小的球团矿在化学反应控速阶段反应最快,在内扩散控速阶段,内扩散阻力最小.
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