Kinetics of Reducibility of Sinter

In order to produce sinter with high reducibility, a relation between sinter structure and its reducibility has been quantitatively investigated. Typical sinter structures and single mineral phases were synthesized using chemical reagents. An one-interface unreacted core model was applied to obtain the reduction rate parameters on these structures and the phases. (1) The reducibility of the diffusion bonded type sinter was higher than that of the melting one, because of its high diffusivity of reducing gas through the reduced layer. (2) As a result of the reduction tests on the single mineral phase, it was proved that the reducibility of the fine type hematite and calciumferrite were higher than that of the prismatic type calciumferrite in slag melt, because of the same reason as described above. (3) By knowing the reducibility of the single mineral phase and each ratio of the phase in the sinter structure, the reducibility of their complex structures can be nearly estimated.