Design of Bed Structure Aiming the Control of Void Structure Formed in the Sinter Cake

Abstract

Fig. 12.Comparison of computed temperature profiles at the center, TC C , and the surface, TC O , of the pellets of 5, 10, 15 mm in size during sintering.

Preparation of BF Burden from Titanomagnetite Concentrate by Composite Agglomeration Process (CAP)

“…[18][19][20] Similar process named mosaic embedding iron ore sintering (MEBIOS) displays its predominance on efficiently using low-grade iron ores and limonite, ensuring high productivity and reducibility and enhancing sinter strength. [21][22][23] Our previous study 24) showed that acidic sinter (basicity < 0.5) made from titanomagntite concentrate mainly solidifies in the form of titanohematite and titanomagnetite and very few perovskite was generated in this sinter. Ultra-high basicity (basicity > 2.5) facilitated the formation of SFCA in sinter, which can offset the adverse effect of perovskite to sinter strength due to its excellent bonding strength.…”

Summarized Achievements of the Porous Meso-mosaic Texture Sinter Research Project

“…Accordingly, the reduction degradation properties are increased by promoting the formation of iron oxide minerals by reducing the slag content and by blending in large amounts of limonite-based minerals with favorable sinter reaction properties and dispersing them into the hematite mineral texture. However, it is thought that the reaction participation of FeO components that results from the addition of MgO components and strengthening of the reducing atmosphere promotes the formation of FeO · Fe 2 ing assimilation process, and evaluation of local strains in the resulting iron oxide [Sasaki] Limonite-based ores characteristically contain combined water and large numbers of pores in their original form, and subjecting them to thermal processing results in a highly reactive material with cracks (low strength) and pores (micropores). When an iron ore of this type is blended in large quantities in the sinter production, the assimilation reaction of the iron ore particles with the resulting melt is naturally speeded up, making it more receptive to processes such as the formation of pores and micro-pores, which has a large effect on the cold strength.…”

“…However, there are still many issues requiring further study, including consideration of the reduction and oxidation reactions that occur in the firing cured bed in cases where coke powder is added to the pellets, for example, and methods for generating meshes for suitably expressing contraction of the bed height or changes in the bed structure caused by the flow of 2) melt occurring in the solid phase. From a heat transfer study by Kasai et al 2) and a model study by Otomo,11) it was judged that the diameter of the dense and large spheres should preferably be about 10-15 mm.…”

“…2) bination and growth of micro-pores into pores, and to promote the combination and growth of pores into voids. In sinter processing schemes where fuel is charged inside the particles, voids must be kept in the sinter bed as a prerequisite for maintaining ventilation.…”

<i>In Situ</i> Temperature Measurement of Sinter Beds at High Spatial and Time Resolution

“…Segregation control is one such technology. 11,18,19) The hightemperature hold time tends to be short in the upper layer of the sinter bed, while the peak temperature of the lower layer is prone to be too high. Segregating coke particles into the top surface moderates the temperature at all layers and improves the quality of the sinter.…”