石灰焼結鉱における MgO と Al_2O_3 分の役割りについて

概要

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The formation of MgO- and Al_2O_3-containing phases in sinter and their changes during reduction were investigated. The results obtained are summarized as follows : (1) MgO either remained in the thermally decomposed material of dolomite or serpentine, or was concentrated in magnetite phase. In this connection, the general idea that MgO is slag component seems to be incorrect. (2) In a reducibility test, a difference in reduction degree was not observed in magnetite containing less than 5% of MgO. (3) During reduction the hemicalcium ferrite in sinter did not form ternary calcium ferrite as an intermediate substance but changed directly to magnetite. (4) Al_2O_3-containing hematite grains were considered to be formed from the multi-component magnetite. The results of optical microscopic observation indicated that fine precipitates were included in the grains. It seemed that the minor component such as Al_2O_3, TiO_2 or MnO was concentrated in these precipitates. In the early reduction stage of sinter microcracks were formed preferentially in the Al_2O_3-containing grains.
社団法人日本鉄鋼協会の論文
1973-08-01