Effect of basicity on metallurgical properties of magnesium fluxed pellets
Jie Li1, Hai-fei An1, Wei-xing Liu1, Ai-min Yang2, Man-sheng Chu3
1 College of Metallurgy and Energy, North China University of Science and Technology, Tangshan 063000, Hebei, China; 2 Hebei Key Laboratory of Data Science and Applications, North China University of Science and Technology, Tangshan 063000, Hebei, China 3 School of Metallurgy, Northeastern University, Shenyang 110819, Liaoning, China
Effect of basicity on metallurgical properties of magnesium fluxed pellets
Jie Li1, Hai-fei An1, Wei-xing Liu1, Ai-min Yang2, Man-sheng Chu3
1 College of Metallurgy and Energy, North China University of Science and Technology, Tangshan 063000, Hebei, China; 2 Hebei Key Laboratory of Data Science and Applications, North China University of Science and Technology, Tangshan 063000, Hebei, China 3 School of Metallurgy, Northeastern University, Shenyang 110819, Liaoning, China
摘要 Magnesium fluxed pellets are the focus of blast furnace burden research for reducing environmental load. The pelletizing, roasting and metallurgical properties of a Chinese fine magnetite ore with the addition of magnesium flux were experi- mentally tested, and the effects of basicity on the consolidation behavior, compressive strength, and reducibility of magnesium fluxed pellets were systematically clarified. Then, the mechanisms were analyzed by means of thermodynamics calculation and scanning electron microscopy–energy-dispersive spectrometry analysis methods. The results show that the consolidation behavior of magnesium fluxed pellets during roasting process was obviously promoted with increasing the basicity of the magnesium fluxed pellets. The compressive strength increased firstly and then decreased, reaching the maximum value of 2352 N/pellet with the basicity of 1.0. The reduction degree increased gradually with enhancing the basicity owing to the fact that the decomposition of the added CaCO3 could increase the porosity of pellets, thereby increasing the CO diffusion in pellet during reduction. Simultaneously, the reduction swelling index was improved with increasing the basicity because the generated calcium ferrite could effectively suppress the growth of iron whiskers.
Abstract:Magnesium fluxed pellets are the focus of blast furnace burden research for reducing environmental load. The pelletizing, roasting and metallurgical properties of a Chinese fine magnetite ore with the addition of magnesium flux were experi- mentally tested, and the effects of basicity on the consolidation behavior, compressive strength, and reducibility of magnesium fluxed pellets were systematically clarified. Then, the mechanisms were analyzed by means of thermodynamics calculation and scanning electron microscopy–energy-dispersive spectrometry analysis methods. The results show that the consolidation behavior of magnesium fluxed pellets during roasting process was obviously promoted with increasing the basicity of the magnesium fluxed pellets. The compressive strength increased firstly and then decreased, reaching the maximum value of 2352 N/pellet with the basicity of 1.0. The reduction degree increased gradually with enhancing the basicity owing to the fact that the decomposition of the added CaCO3 could increase the porosity of pellets, thereby increasing the CO diffusion in pellet during reduction. Simultaneously, the reduction swelling index was improved with increasing the basicity because the generated calcium ferrite could effectively suppress the growth of iron whiskers.
Jie Li,Hai-fei An,Wei-xing Liu, et al. Effect of basicity on metallurgical properties of magnesium fluxed pellets[J]. Journal of Iron and Steel Research International, 2020, 27(3): 239-247.