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Metals 2018, 8(12), 1008; https://doi.org/10.3390/met8121008

The Macroscopic Flow direction and Microscopic Distribution of Mg in Sintered Products and Its Influence

School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijng 100083, China
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Received: 2 November 2018 / Revised: 25 November 2018 / Accepted: 29 November 2018 / Published: 1 December 2018
(This article belongs to the Special Issue Selected Papers from 8th ICSTI 2018)
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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. View Full-Text
Keywords: sinter; magnesium; flow direction; microscopic distribution; SFCA sinter; magnesium; flow direction; microscopic distribution; SFCA
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Wu, S.; Zhang, W.; Kou, M.; Zhou, H. The Macroscopic Flow direction and Microscopic Distribution of Mg in Sintered Products and Its Influence. Metals 2018, 8, 1008.

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