Influence of Alumina Component on Melt Formation in Sintering Process and Sinter Quality Improving Technology
Yohzoh HOSOTANI, Norimitsu KONNO, Shigehisa KABUTO, Mitsuaki KITAMURA, Tetsuya ABE
The bad influence of the Al2O3 component in sinter on the product yield and the sinter quality has already been verified through the experience acquired in the actual operation. It is also reported that much research has been conducted on a technology for minimizing this bad influence of the Al2O3 component in sinter.
A method to suppress the bad influence of the Al2O3 component on the product yield and the sinter quality was examined. The purpose of this method was to form a crystal embedding Al2O3 component in a silicate slag phase, while preventing a rise in the melting point due to the Al2O3 component.
The adoption of a method which mixes FeO raw material at a high rate in combination with the use of limestone coarser than that previously used has raised the product yield and improved the sinter quality as well. Further, with this method, a eutectic microstructure made up of "Magnetite + Fine calcium ferrite + Silicate slag" has been increased in sinter. The Al2O3 content in the eutectic microstructure is more than twice the average content of Al2O3 of the entire sinter. This condition is such that the Al2O3 component has been embedded in this eutectic microstructure. The increase in this eutectic microstructure of sinter has resulted in the improvement in the product yield and low-temperature reduction degradation index (RDI) of sinter.
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