Relation between Sticking and Metallic Iron Precipitation on the Surface of Fe_2O_3 Particles Reduced by CO in the Fluidized Bed
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概要
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The Fe2O3 particles (150–224 μm diameter) were reduced in a laboratory fluidized bed with CO–N2 mixture gas at 700–900°C to investigate the relation between sticking and iron precipitation. As a result, the sticking tended to occur with acceleration of the reduction rate, judging from the fluidization time. The sticking depended strongly on the metallization ratio signifying the probability of iron-iron contact that estimated the contact area of precipitated iron when particles collide together, whereas the reduction degree had indirect influence on it. Many tiny iron grains with the diameter of approximately 20–40 nm were found on the surface of particles by SEM and EDS. According to theory of microcrystal melting point, the grains reached Tammann temperature easily, leading to higher surface energy of iron, producing higher adhesion force among the reduced particles.
- 2011-08-15
著者
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Guo Zhancheng
State Key Lab. Of Advanced Metallurgy Univ. Of Sci. And Technol. Beijing
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Gong Xuzhong
National Engineering Laboratory For Hydrometallurgical Cleaner Production Technology Institute Of Process Engineering Chinese Academy Of Sciences
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ZHANG Ben
State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing
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WANG Zhi
National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Institute of Process Engineering, Chinese Academy of Sciences
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Zhang Ben
State Key Laboratory Of Advanced Metallurgy University Of Science And Technology Beijing
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Guo Zhancheng
State Key Laboratory Of Advanced Metallurgy University Of Science And Technology Beijing
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Wang Zhi
National Engineering Lab. For Hydrometallurgical Cleaner Production Technol. Inst. Of Process Engineering Chinese ...
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Wang Zhi
National Engineering Laboratory For Hydrometallurgical Cleaner Production Technology Institute Of Process Engineering Chinese Academy Of Sciences
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