石灰石粗粒化による焼結鉱の生産性および還元粉化性の改善

概要

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Sintering tests were carried out by using high Al_2O_3 ores to clarify the influence of limestone particle size on the production and the quality of sinter. Delayed decomposition of limestone and melt formation by increased size of limestone particles increases the permeability of the sintering bed and makes the heat pattern sharp, which leads to an increase in productivity and better quality sinter on the degradation characteristic during reduction. The measurements of fracture toughness of calcium ferrite and glassy silicate by Vickers indentation show little difference between their values. On the other hand calcium ferrite has the lowest value of critical fracture toughness, indicating that crack initiation characteristics, among minerals in sinter, affect the degradation of sintered ore during reduction. Formation mechanism of the skeletal hematite was tested experimentally and it was found that magnetite coexisted with liquid slag melt is oxidized as the temperature decreases during last half stage of sintering.
社団法人日本鉄鋼協会の論文
1985-12-01