Effect mechanism of raw material ratios on metallurgical performance and microstructure of iron coke
Iron coke is one of the main potential technologies for low-carbon ironmaking in blast furnaces.Evolution characteristics of the tensile strength,mechanical strength,and thermal properties of iron coke under different raw material ratios were analyzed.The mechanism of the influence of raw material ratios on the microstructure,pore structure,and carbon crystal structure of iron coke was analyzed using characterization methods such as optical microscope,SEM-EDS,BET,and XRD.The research results indicate that a lower porosity and a more uniform pore structure in iron coke contribute to enhancing its tensile strength.When the iron ore powder content exceeds 10 mass％,there is a significant decrease in the mechanical strength of the iron coke.Taking into account the mechanical strength and thermal performance of iron coke,the mass fraction of iron ore powder added should not exceed 15 mass％.By adjusting the addition of 1/3 coking coal to optimize the metallurgical performance of the iron coke,it is found that when the addition is between 20 mass％-22 mass％,the mechanical strength of the iron coke reaches the level of second-grade coke.The reactivity of iron coke exhibits a trend of initially decreasing and then increasing with the increasing in 1/3 coking coal content,and the underlying reason is the change in carbon structure and micropore structure.
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维普
