Reduction Behavior of Sinter Based on Top Gas Recycling-Oxygen Blast Furnace  

作　　者：LAN Rong-zong 1 , 2 , WANG Jing-song 1 , HAN Yi-hua 1 , SHE Xue-feng 1 , WANG Lin-tao 1 , XUE Qing-guo 1 ( 1.State Key Laboratory of Advanced Metallurgy , University of Science and Technology Beijing , Beijing 100083 , China  2.China Railway Materials Xiamen Steel Co Ltd , Xiamen 361008 , Fujian , China ) 

出　　处：《Journal of Iron and Steel Research International》2012年第9期13-19,共7页

基　　金：Item Sponsored by National Basic Research Program of China ( 973Program )( 2012CB720401);National Key Technology Research and Development Program in 12th Five-Year Plan of China ( 2011BAC01B02)

摘　　要：In order to explore the behavior laws of sinter reduction in TGR-OBF ( top gas recycling-oxygen blast furnace ), reduction experiments of sinter have been conducted by thermal balance mass loss method with different atmospheres , temperatures and volume flows.The changes of RI ( reduction degree of Fe 2 O 3 ), RI′ ( reduction rate of Fe 2 O 3 ) and r ( reduction degree of FeO ) have been examined.The results show that the reduction of sinter was significantly improved under TGR-OBF atmosphere , and the RIand r were measured up to 98.2%and 97.8%at 900℃ respectively.With increasing of the reduction temperature , the reduction of sinter speeded up greatly , and the reduction time-duration shortened from 117min at 900 ℃ to 63min at 1 100 ℃.Moreover , the reduction of sinter enhanced with increasing of the reductive gas flow.When the flow increased from 10to 15L / min , the initial reduction rate of sinter increased from 2.47% / min to 3.73% / min.While increasing H2and CO contents in the reductive atmosphere , the reduction of sinter was promoted.Besides , H 2 influenced more evidently than CO to the reduction of sinter , especially in the later stage of the reduction process , for instance , the reduction of wustite will be improved enormously when increasing the H2content in the reductive atmosphere.In order to explore the behavior laws of sinter reduction in TGR-OBF ( top gas recycling-oxygen blast furnace ), reduction experiments of sinter have been conducted by thermal balance mass loss method with different atmospheres , temperatures and volume flows.The changes of RI ( reduction degree of Fe 2 O 3 ), RI′ ( reduction rate of Fe 2 O 3 ) and r ( reduction degree of FeO ) have been examined.The results show that the reduction of sinter was significantly improved under TGR-OBF atmosphere , and the RIand r were measured up to 98.2%and 97.8%at 900℃ respectively.With increasing of the reduction temperature , the reduction of sinter speeded up greatly , and the reduction time-duration shortened from 117min at 900 ℃ to 63min at 1 100 ℃.Moreover , the reduction of sinter enhanced with increasing of the reductive gas flow.When the flow increased from 10to 15L / min , the initial reduction rate of sinter increased from 2.47% / min to 3.73% / min.While increasing H2and CO contents in the reductive atmosphere , the reduction of sinter was promoted.Besides , H 2 influenced more evidently than CO to the reduction of sinter , especially in the later stage of the reduction process , for instance , the reduction of wustite will be improved enormously when increasing the H2content in the reductive atmosphere.

关 键 词：oxygen blast furnace SINTER REDUCTION 

分 类 号：TF046.4[冶金工程—冶金物理化学]