Reduction Behaviors of Pellets Under Different Reducing Potentials  

作　　者：ZUO Xiao-jian WANG Jing-song AN Xiu-wei SHE Xue-feng XUE Qing-guo 

机构地区：[1]State Key Laboratory of Advanced Metallurgy,University of Science and Technology Beijing

出　　处：《Journal of Iron and Steel Research International》2013年第12期12-18,共7页

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

摘　　要：Owing to the change of gas composition in top gas recycling-oxygen blast furnaces compared with tradi- tional blast furnace, many attentions are attracted to the research on iron oxide reduction again. In order to study the influence of H2 and CO on the reduction behavior of pellets, experiments were conducted with H2-N2, CO N2 or H2-CO gas mixtures at 1 173 K by measuring the mass loss, respectively. It was found that the reduction degree in creased with increasing the ratio of H2 or CO in the gas mixture, but the reduction with hydrogen was faster than that with carbon monoxide. The reduction degree could reach 96. 720/00 after 65 rain for the reduction with 50~ H2 ＋ 50% N2, while it is only 53.37~ for the reduction with 50~ COq-50~ N2. The addition of hydrogen to carbon monoxide will accelerate the reduction because the hydrogen molecules are more easily chemisorbed and reacted with iron oxide than carbon monoxide. A scanning electron microscope was used to characterize the structures of reduced samples. Dense structure of iron was obtained in the reduction with hydrogen while the structure of iron showed many small fragments for the reduction with carbon monoxide. At the later stage of reduction with the gas mixtures containing carbon monoxide, the reduction curves showed a descending trend because the rate of carbon deposition caused by the thermal decomposition of carbon monoxide was faster than the rate of oxygen loss. Compared with the reduction with CO-N2 and H2 CO gas mixtures, H2 gas could enhance the carbon deposition while N2 gas would re- duce this phenomenon. The results of X-ray diffraction and chemical analysis demonstrated that the carbons are mainly in the form of cementite （FeaC） and graphite in reduced sample.Owing to the change of gas composition in top gas recycling-oxygen blast furnaces compared with tradi- tional blast furnace, many attentions are attracted to the research on iron oxide reduction again. In order to study the influence of H2 and CO on the reduction behavior of pellets, experiments were conducted with H2-N2, CO N2 or H2-CO gas mixtures at 1 173 K by measuring the mass loss, respectively. It was found that the reduction degree in creased with increasing the ratio of H2 or CO in the gas mixture, but the reduction with hydrogen was faster than that with carbon monoxide. The reduction degree could reach 96. 720/00 after 65 rain for the reduction with 50~ H2 ＋ 50% N2, while it is only 53.37~ for the reduction with 50~ COq-50~ N2. The addition of hydrogen to carbon monoxide will accelerate the reduction because the hydrogen molecules are more easily chemisorbed and reacted with iron oxide than carbon monoxide. A scanning electron microscope was used to characterize the structures of reduced samples. Dense structure of iron was obtained in the reduction with hydrogen while the structure of iron showed many small fragments for the reduction with carbon monoxide. At the later stage of reduction with the gas mixtures containing carbon monoxide, the reduction curves showed a descending trend because the rate of carbon deposition caused by the thermal decomposition of carbon monoxide was faster than the rate of oxygen loss. Compared with the reduction with CO-N2 and H2 CO gas mixtures, H2 gas could enhance the carbon deposition while N2 gas would re- duce this phenomenon. The results of X-ray diffraction and chemical analysis demonstrated that the carbons are mainly in the form of cementite （FeaC） and graphite in reduced sample.

关 键 词：REDUCTION PELLET HYDROGEN carbon monoxide carbon deposition 

分 类 号：TF511[冶金工程—钢铁冶金]