Fe content in hematite ore is gradually decreasing. The usage low Fe ore in sintering process increase the volume of a bonding agent as fuel in order to maintain the yield and the strength of sinter ores. However the usage of a bonding agent cause more CO2 emissions. Therefore, a magnetite ore has been focused because it can perform magnetic separation and can produce a large amount of oxidization heat. It is because reduction of gangue quantity by magnetic separation makes it possible to produce low slag sintered ore with good reducibility and utilization of oxidizing heat is expected to reduce use of coagulant. Hence, there are many studies on the oxidation of magnetite. However, despite important reaction as well as oxidation of magnetite, the details of the assimilation of magnetite have not been elucidated. In order to utilize the magnetite ore in the sintering process in the future, it is indispensable to elucidate the mechanism of assimilation of magnetite ore and explore appropriate raw material design. In this report, we introduce the result of fundamental study on assimilation of magnetite ore and limestone. In this study, a cylindrical tablet hat was modelled the adhesive layer of a pseudo particle was prepared and heat treated in the air. As a result of observation of this tablet, it was confirmed that the assimilability of magnetite ore varies depending on the particle size of limestone. Magnetite ore blended with fine grain limestone had higher strength of sinter ores than magnetite ore mixed with coarse grain limestone due to its small pore diameter.
CITATION:Morioka, A, Matsumura, M and Okazaki, J, 2019. Promoting assimilation of magnetite fine ore for CO2 reduction from sintering process, in Proceedings Iron Ore 2019, pp 140144 (The Australasian Institute of Mining and Metallurgy: Melbourne).