1 College of Materials and Metallurgy, Guizhou University, Guiyang 550025, Guizhou, China; 2 School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, Hunan, China; 3 Sinosteel Equipment & Engineering Co., Ltd., Beijing 100080, China
Influence of basicity on metallurgical performances of fired superhigh-grade magnetite pellets in hydrogen-rich gases
1 College of Materials and Metallurgy, Guizhou University, Guiyang 550025, Guizhou, China; 2 School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, Hunan, China; 3 Sinosteel Equipment & Engineering Co., Ltd., Beijing 100080, China
摘要 The influence of basicity on the metallurgical performances and reduction characteristics of fired super high-grademagnetite pellets under the simulated shaft furnace gas conditions was investigated. The fired pellets in the basicity rangeof 0.09 (natural basicity) to 1.00 show superior reducibility and low-temperature disintegration performance. However, inthe basicity range of 0.20–0.80, the abnormal swelling of the fired pellets occurs. Improving basicity from 0.09 to 0.40promotes the generation of low melting point slag phases and lower porosity of fired pellets, and accelerates the growth anddensification of hematite crystals, impeding the reduction of hematite particles and the formation of metallic iron shell. Inaddition, the slags that distribute between the hematite particles absorb the reduction stresses by increased distancesbetween the particles during the reduction process, which leads to the large reduction swelling of pellets.
Abstract：The influence of basicity on the metallurgical performances and reduction characteristics of fired super high-grademagnetite pellets under the simulated shaft furnace gas conditions was investigated. The fired pellets in the basicity rangeof 0.09 (natural basicity) to 1.00 show superior reducibility and low-temperature disintegration performance. However, inthe basicity range of 0.20–0.80, the abnormal swelling of the fired pellets occurs. Improving basicity from 0.09 to 0.40promotes the generation of low melting point slag phases and lower porosity of fired pellets, and accelerates the growth anddensification of hematite crystals, impeding the reduction of hematite particles and the formation of metallic iron shell. Inaddition, the slags that distribute between the hematite particles absorb the reduction stresses by increased distancesbetween the particles during the reduction process, which leads to the large reduction swelling of pellets.
Feng Zhang,De-qing Zhu,Jian Pan, et al. Influence of basicity on metallurgical performances of fired superhigh-grade magnetite pellets in hydrogen-rich gases[J]. Journal of Iron and Steel Research International, 2021, 28(10): 1212-1222.
2021, Vol. 28 
