焼結鉱融液生成に及ぼすアルミナ成分の影響と品質改善技術

概要

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The bad influence of the Al_2O_3 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 Al_2O_3 component in sinter. A method to suppress the bad influence of the Al_2O_3 component on the product yield and the sinter quality was examined. The purpose of this method was to form a crystal embedding Al_2O_3 component in a silicate slag phase, while preventing a rise in the melting point due to the Al_2O_3 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 Al_2O_3 content in the eutectic microstructure is more than twice the average content of Al_2O_3 of the entire sinter. This condition is such that the Al_2O_3 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.
社団法人日本鉄鋼協会の論文
1997-06-01