Abstract
In order to clarify the influence of micro pore in sinter on the reducibility and permeability of actual blast furnace, the properties of actual sinter sample above 1000°C were measured by use of the apparatus reported in the past and the micro pore volume distributions under 400 μm were measured by the mercury porosimeter.
The properties of 10 kinds of actual sinter sample with almost the same chemical compositions were measured and the relation between the sinter properties and the operation results of blast furnace at which the sinter was used by 80% in burden was examined concerning the reducibility and permeability.
As a result of these analyses. the mean diameter of micro pore under 400μm (MDMP) was derived as the controlling factor affected on the reducibility and permeability of blast furnace.
As the micro pore under 1 μm is generated abundantly in the sinter with small MDMP during reduction, the reduction is accelerated above 1000°C, especially above 1200°C and the FeO contained melt is also reduced. As the FeO contained melt is difficult to enter into the micro pore under 1 μm, the reduced metal with abundant micro pore under 1 μm is generated and suppresses the metal agglomeration.
The technology to reduce MDMP in sinter is expected to be developed from now on.
