Improvement of Sinter Productivity by Control of Magnetite Ore Segregation in Sintering Bed

• Published in: ISIJ International Vol. 58; no. 12; pp. 2200 - 2209
• Main Authors: Iwami, Yuji, Yamamoto, Tetsuya, Oyama, Nobuyuki, Matsuno, Hidetoshi, Saito, Noritaka, Nakashima, Kunihiko
• Format: Journal Article
• Language: English
• Published: The Iron and Steel Institute of Japan 15.12.2018
• Subjects: interfacial reaction; magnetic force; magnetite; melting; segregation; sinter
• ISSN: 0915-1559; 1347-5460
• DOI: 10.2355/isijinternational.ISIJINT-2017-691

Recently, the quality of sinter feed ore used in sintering process has deteriorated. In particular, T.Fe has decreased and gangue component has increased in the sinter feed ore. Increase of gangue is not only the factor to influence sinter qualities, but also the factor to increase coke ratio in the blast furnace operation as the increase of slag ratio. Therefore, to cope with the deterioration of iron ore qualities, studies on alternative iron ore resources and development of its utilization technology have been required.In that kind of new iron ore resources, authors focus on high grade magnetite fine. In the past, there are some studies about the effect of mixing ratio and size of magnetite fine on productivity and quality, but there are few studies about magnetite fine segregation in charging. In addition, magnetite fine decreases sinter productivity by the decrease of permeability of sintering bed. A new study for using large amount of magnetite fine is required.In this research, the control method of magnetite fine segregation by magnetic force at charging and the improvement of sinter productivity by this method was studied. The effect of upper segregation of magnetite fine was studied through the analysis of melting behavior and interfacial reaction of calcium ferrite melts into hematite substrate and magnetite substrate.