Influence of initial iron ore particle size on CO2 gasification behavior and strength of ferro-coke  

作　　者：Run-sheng Xu Shu-liang Deng Heng Zheng Wei Wang Ming-ming Song Wei Xu Fang-fang Wang 

机构地区：[1]State Key Laboratory of Refractories and Metallurgy,Wuhan University of Science and Technology,Wuhan 430081,Hubei,China [2]Chair of Metallurgy,Montanuniversitat Leoben,Leoben A-8700,Austria [3]Wuhan Iron and Steel Co.,Ltd.,Wuhan 430081,Hubei,China [4]School of Energy and Power Engineering,Beihang University,Beijing 100191,China [5]Ningbo Institute of Technology,Beihang University,Ningbo 315800,Zhejiang,China

出　　处：《Journal of Iron and Steel Research International》2020年第8期875-886,共12页

基　　金：The authors acknowledge financial support from the National Natural Science Foundation of China(51704216 and U1760101);National Postdoctoral Program for Innovative Talents Funded Project(BX20180023);China Postdoctoral Science Foundation Funded Project(2019M650424).

摘　　要：Highly reactive ferro-coke has been widely studied due to its contribution to the energy saving and emission reduction in blast furnace ironmaking. To optimize the coking process of ferro-coke and improve its metallurgical properties, it is necessary to clarify the influence of initial iron ore on the strength, micro-morphology and CO2 gasification reaction behavior of formed ferro-coke. The effects of initial iron ore particle size (0.50–1.00, 0.25–0.50 and 0.074–0.125 mm) on the CO2 gasification reaction of ferro-coke were analyzed using thermo-analysis technique. In addition, the effects of initial iron ore particle size on the strength and morphology of ferro-coke were investigated by drum test, digital microscopy and scanning electron micro-scopy. The results show that iron reduced from iron ore has a great promotion effect on the CO2 gasification reaction of ferro-coke. The smaller the particle size of initial iron ore, the more intense the gasification reaction, and the lower the starting temperature for gasification reaction of ferro-coke. The results of kinetic calculation show that the apparent activation energy of ferro-coke decreases with the decreasing particle size of blended iron ore. The particle size of initial iron ore has a great impact on the strength of ferro-coke. The ferro-coke prepared by 0.25–0.50 mm iron ore presents the best strength in this experiment.

关 键 词：Ferro-coke Iron ore Particle size STRENGTH Gasification reaction 

分 类 号：TF534[冶金工程—钢铁冶金]