Abstract
Magnesium flux is an indispensable part of sintering materials. Its distribution and reaction behavior have an important influence on the quality of the sinter. Studying the macroscopic flow direction and microscopic distribution of MgO in sintered products is important for guiding the matching of ore for sintering and adjusting sintering technical parameters. The macroscopic flow direction situation of MgO in all sintered products was studied using X-Ray diffractometer and X-Ray fluorescence analyzer. In addition, the microscopic distribution characteristics of Mg element in the main sintered products were studied using scanning electron microscope and energy dispersive spectrometer. The results of this research are as follows. The Mg contents of sintered products are in the following increasing order: sinter ore, sinter internal return ore, and blast furnace return ore. The Mg content of the 1 to 2 mm grain size is the highest in the sinter internal return ore and blast furnace return ore, which is related to the granular distribution of magnesium flux. Moreover, the Mg content of sintered minerals are in the following decreasing order: magnetite; silico-ferrites of calcium and aluminium (SFCA); and silicate and hematite, and the Mg dissolving in the SFCA has a tendency to make the SFCA morphology coarse. The diffusion range of Mg in a large dolomite particle is much narrower, and it mainly stays at the position where the dolomite is located. In the actual sintering process, Mg increases the viscosity of the sintering liquid phase and prevents the oxidation of magnetite, which is not conducive to the improvement of the strength of the sinter.
Highlights
Blast furnace ironmaking requires basic slag with excellent metallurgical properties.These properties are necessities for a high-quality, high-yield and low-consumption ironmaking process.Appropriate MgO content in the slag facilitates the improvement of its metallurgical properties [1,2,3,4,5].In general, the magnesium content in iron ore is too low to meet the demand for blast furnace ironmaking [6]
Since adding dolomite to the blast furnace will bring a series of adverse effects [7,8,9], magnesium-containing fluxes are usually added during the sintering process
Time, we examined the Mg contentto inmake silico-ferrites of calcium and aluminium (SFCA)
Summary
Blast furnace ironmaking requires basic slag with excellent metallurgical properties.These properties are necessities for a high-quality, high-yield and low-consumption ironmaking process.Appropriate MgO content in the slag facilitates the improvement of its metallurgical properties [1,2,3,4,5].In general, the magnesium content in iron ore is too low to meet the demand for blast furnace ironmaking [6]. Blast furnace ironmaking requires basic slag with excellent metallurgical properties. These properties are necessities for a high-quality, high-yield and low-consumption ironmaking process. The magnesium content in iron ore is too low to meet the demand for blast furnace ironmaking [6]. Since adding dolomite to the blast furnace will bring a series of adverse effects [7,8,9], magnesium-containing fluxes are usually added during the sintering process. It can be seen that the reaction behavior of MgO is closely related to the quality index of sintering production. The distribution of Mg in sintered products can reflect the reaction behavior of Mg in the sintering process, to some extent.
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
