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《Iron & Steel》 2013-01
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Direct Reduction Behavior of Multi-Layer Pellets With Carbon-Containing in Rotary Hearth Furnace

LUN Zhi-gang,HU Tu,Lü Xue-wei(College of Materials Science and Engineering,Chongqing University,Chongqing 400044,China)  
In order to have a clear acknowledge about the reduction discipline of multilayer pellets in rotary hearth furnace,the direct reduction of carbon-containing pellets made of vanadium-titanium iron concentrate was employed.The influences of reduction temperature and reduction time on the metallization of different layers pellets and the reduction order of iron-bearing minerals in vanadium-titanium iron concentrate were discussed.The results show that the reduction reactions do not take place simultaneous in the bed of multilayer pellets,where the top layer pellets was reduced and even then reoxidized while the bottom layer pellets was only reduced to some extent;the average metallization ratio of the pellets increases with the increasing temperature and it exhibits an phenomena of firstly increased and then decreased with the reduction time prolonged.There exists an optimal reduction time,which is 25 min,to get the maximum metallization ratio;the reduction difficulty of iron-bearing minerals in vanadium-titanium iron concentrate increases as following order: Fe2TiO5→Fe3O4→FeO→Fe2TiO4→FeTiO3.
【Fund】: 国家自然科学基金资助项目(51090383)
【CateGory Index】: TF711
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