Hydrogen reduction behavior of composite iron ore sinter

The composite iron ore sinter, which is composed of the dense pre-granulated pellet and the porous induction bed, is produced experimentally. Only a single dense pre-granulated pellet is placed at the center of the porous induction bed. In order to examine what kind of mineral composition and pore structure are desirable from the viewpoint of the reducibility of the composite iron ore sinter, the hydrogen reduction experiments are conducted at 1173 K. The reduction rate of the composite iron ore sinter, which is composed of the dense pre-granulated pellet and the porous induction bed, is larger than the uniform pellet, of which the whole composition is identical. Moreover, the reduction becomes faster by considering the compositional design between the porous induction bed and the dense pre-granulated pellet. It is desirable to contain CaO and SiO₂ more in the porous induction bed than in the dense pre-granulated pellet.