Research on FeO Content of Sinter Used in Shagang's 5800 m³ Blast Furnace

This is an article in the field of metallurgical engineering. To provide a theoretical basis for FeO composition control and quality optimization of sinter, the metallurgical properties of sinter ore used in 5800 m³ blast furnace of Shagang, such as drum strength, low-temperature reduction pulverization, medium-temperature reducibility were investigated. The effect of FeO content on the performance of sinter and the factors affecting FeO content were explored through statistical data analysis. The results show that based on Shagang's current raw material quality, ore blending structure and process operating conditions, the increase of FeO content can improve the drum index and RDI_+3.15 of sinter. When RI is more than 85%, the FeO content becomes the limiting factor of RI, and the appropriate value of FeO content is about 9.5%. The increase of R, SiO₂ content, fine powder and fuel ratio will cause the increase of FeO content, MgO content and negative pressure will cause the decrease of FeO content. Data analysis shows if R is 1.9, the contents of SiO₂ and MgO are about 5.2% and 1.8%, respectively. The ratio of fine powder is less than 11%, the ratio of fuel is between 4.5 and 5%, and the negative pressure is below 16 KPa, the average FeO content of sinter is about 9.5%, the corresponding drum index is about 80%. The average values of RDI_+3.15 and RI are above 75% and 80%, respectively.