Study on Catalytic Mechanism of Reducing Hematite by Carbon at Low Temperature
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摘要: 通过碳的气化反应、气体还原氧化铁以及碳粉还原氧化铁试验,探明了氧化铁的催化还原机理。加入催化剂后,碳的气化反应速率和铁矿的还原速率提高,并表现出相似的变化规律,K2O3和Na2CO3的催化效果明显优于CaCO3的催化效果。对于气化反应和氧化铁的还原反应,催化剂的加入等同提高了碳的活性,由于碳活性的提高,加速了碳的气化反应进行,促进了氧化铁还原中的间接还原反应和直接还原反应,最终加速了氧化铁的还原反应。Abstract: The catalytic mechanism of reducing hematite was elucidated by experiments of Boudouard reaction and reducing hematite by CO gas and carbon.The rate of gasification reaction and reduction reaction was increased and showed similar tendency after addition of the catalyst.The catalytic effect of K2CO3 or Na2CO3 is substantially better than that of CaCO3.The adding of catalyst seems to improve reactivity of carbon for hematite reduction,then accelerates the Boudouard reaction and promotes indirect reaction and direct reaction of hematite reduction,finally accelerates the reduction of hematite.
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Key words:
- hematite /
- carbon /
- catalytic mechanism /
- reduction
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