The article delves into an in-depth study on the degradation of coke,aiming to analyze the microscopic structural changes of coke inside the blast furnace and their impact on coke quality.Off-line tuyere sampling techniques were employed to obtain coke samples of different particle sizes.Through various detection methods such as industrial analysis,X-ray diffractometry,and scanning e-lectron microscopy,the microscopic structure and mineral characteristics of coke were systematically investigated.The research results indicate that a decrease in the particle size of coke after entering the blast furnace will reduce the permeability and fluidity of the coke bed.As the proportion of coke sam-ples smaller than 10 mm decreases,the slag-iron content in the coke samples also decreases.Com-pared to the coke charged into the furnace,the ash content in SiO2 and Al2O3 of tuyere coke decrea-ses,while the content of CaO and alkali metals increases.To protect the coke,it is recommended to reduce the introduction of CaO and alkali metals into the blast furnace.The presence of iron oxides in-side tuyere coke suggests that the erosion of molten iron in the blast furnace is also one of the factors contributing to the degradation of coke in the blast furnace.
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