Abstract:Softening and melting tests under load of sinter with varying Al2O3 content were carried out. In addition, microstructure and mineral composition of sinter at different temperatures were also analyzed and the mechanism that the effect of Al2O3 content on sinter softening and melting property was elucidated. Results showed that the increase of Al2O3 content in sinter favored the formation of Al2O3-rich slag phase with lower melting point, such as gehlenite (2CaO·Al2O3·SiO2) and the eutectic (2CaO·SiO2-2CaO·Al2O3·SiO2-FeO), resulting in the blockage of open pore. During melting-dripping process, slag phase of high Al2O3 sinter had a relative higher Al2O3 content. With the increase of Al2O3 content, the liquidus temperature and viscosity of slag phase existing between metallic iron particles was deteriorated. It decreased the concentration of metallic iron and then increased the dripping temperature. Meanwhile, high Al2O3 content sinter was associated with a thicker melting-dripping zone, leading to the deterioration of sinter bed permeability.
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