Super-high bed sintering for iron ores:problems ascertainment  

作　　者：Liang-ping Xu Hui-bo Liu Yu-chao Zhao Qiang Zhong Zhong-lin Dong Guang-hui Li Tao Jiang 

机构地区：[1]School of Minerals Processing and Bioengineering,Central South University,Changsha,410083,Hunan,China

出　　处：《Journal of Iron and Steel Research International》2024年第5期1063-1070,共8页

基　　金：supported by the National Natural Science Foundation of China(Grant No.52274290);the Basic Science Center Project for the National Natural Science Foundation of China(No.72088101).

摘　　要：Super-high bed sintering process is an important development direction of iron ore sintering for its lower emission and higher yield.However,there is a lack of deep understanding of the uneven quality of super-high bed sintering products,and the deterioration of reduction disintegration performance,the thickening of hearth layer and the reduction in energy-saving effect are perplexing enterprises and researchers.To ascertain the problems of super-high bed sintering,ten sintering machines with the areas of 265,280,360,550 and 660 m^(2)and bed depth above 900 mm were sampled and analyzed.The results showed that problems were mainly shown in the unevenness of chemical composition,macrostructure,mechanical strength and metallurgical performance.The chemical composition exhibits severe segregation in both horizontal and vertical directions,with basicity segregation reaching as high as 0.81.The uneven macrostructure of sinter is reflected in a 10%difference in porosity and mechanical strength increase in 16%–19%along the vertical direction.The reducibility and reduction disintegration performance gradually deteriorate along the bed depth,with a difference of 10.5%in reducibility and 7.3%in RDI−0.5 mm(reduction disintegration index of sinter with size smaller than 0.5 mm).

关 键 词：Super-high bed sintering Uneven sinter performance Segregation AGGLOMERATION Iron ore 

分 类 号：TF53[冶金工程—钢铁冶金]