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Effects of gangue compositions on reduction process of carbonbearing iron ore pellets

Journal of Iron and Steel Research International 2018年第11期25卷 1105-1112页

作者： Qing-min Meng Jia-xin Li Ru-fei Wei Hong-ming Long Tie-jun Chun Ping Wang Zhan-xia Di Luana Dessbeseli Chunbao Xu School of Metallurgical Engineering Anhui University of TechnologyMa'anshan 243002AnhuiChina Key Laboratory of Metallurgical Emission Reduction and Resources Recycling (Anhui University of Technology) Ministry of EducationMa'anshan 243002AnhuiChina Department of Chemical and Biochemical Engineering Western UniversityLondonON N6A 3K7Canada

The influence of gangue compositions (mainly composed of SiO2,CaO,MgO and Al2O3)on the reduction kinetics of carbon-bearing iron ore pellets was estimated at 1373-1473 K in N2 *** results showed that gangue content and each component distribution affected the pellets reduction *** reduction rate was found to follow a linear correlation with quaternary basicity R4 [mass ratio of (CaO +MgO)to (SIO2 +Al2O3)]of the carbon-beating iron ore pellets;also,the content of SiO2 solid solution in iron oxide had a significant impact on the reduction *** the same reduction temperature,a higher R4 resulted in a lower SiO2 free content,weakening its inhibitory effect on the Boudouard *** reduction temperature of Fe2SiO4 could be reduced by increasing the contents of CaO and MgO,improving the iron oxide reduction as well as the precipitation and growth of the iron *** g'angue content and .component distribution showed no effect on the rate-controlling step of the reduction;however,the apparent activation energy of reaction decreased with increasing quaternary *** R4 increased from 0.15 to 0.67,the apparent activation energy decreased from 228.51 to 193.66 kJ/mol.

关键词： carbon-bearing iron ore pellet Gangue composition Quaternary basicity Reduction kinetics Apparent activation energy

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