Mechanism of action of improving reduction on low grade hematite pellets by adding nucleating agent
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摘要: 對某低品位赤鐵礦球團直接還原過程中成核劑作用機理進行了研究.結果表明:在直接還原過程中,成核劑能夠使金屬鐵晶粒形核位壘降低50%以上,有效促進了金屬鐵晶粒快速形核.同時,添加成核劑后,球團的還原表觀活化能由18.10kJ·mol-1降低到10.15 kJ·mol-1,降低了43.92%.表觀活化能越低,還原反應越容易進行,即成核劑能夠有效促進鐵礦物還原,從而提高還原球團的金屬化率.Abstract: The mechanism of action of nucleating agent was studied during the direct reduction of low grade hematite pellets in Central South China.The results show that the nucleating barrier is reduced by over 50% by adding a nucleating agent in the hematite pellets,which can effectively improve the nucleating of metal iron grains during the direct reduction.Because of the nucleating agent,the apparent activation energy of the hematite pellets decreases from 18.10 kJ·mol-1 to 10.15 kJ·mol-1,dropping by 43.92%.The lower the apparent activation energy,the easier the reduction reaction takes place.It is concluded that the nucleating agent can efficiently improve the direct reduction and upgrade the metallization degree of the reduced pellets.
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Key words:
- hematite /
- direct reduction process /
- nucleating agent /
- activation energy /
- nucleation /
- metal grains
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