8th International Congress on Science and Technology of Ironmaking - ICSTI 2018

Flow and Occurrence of Magnesium in Sintered Products were studied by XRF and SEM-EDS. The results of this research are as follows. The figure shows magnesium content of sintered products in the following decreasing order: blast furnace return fine, sinter return fines, finished ore. Moreover, magnesium content in the 0.5mm-3.15mm size of blast furnace return fine is especially high. Magnesium content of sintered minerals is in the following decreasing order: magnetite, SFCA, silicate, hematite. Magnesium existing in the magnetite will generate magnesia magnetite, which prevents the oxidation of magnetite and then reduces the SFCA liquid phase. Magnesium existing in the SFCA will increase the viscosity of SFCA to reduce the bonding range of the liquid phase and may affect the crystallization state of SFCA, so it will deteriorate the strength index of sinter. The incompletely assimilated dolomites were found in the sintered products and the diffusion range of magnesium is wider than that of calcium, because the chemical reaction ability of calcium oxide is higher than that of magnesium oxide.