<研究論文>ピソライト鉱石を原料とした焼結鉱に存在する粗大気孔の生成に対する融液性状の影響

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Sintering experiments were conducted in order to suppress the formation of large poresexisted in the assimilated parts of sinter produced using pisolitic limonite ores. Modeledpseudo-particles, which consisted of coarse iron ore particle as cores and fine mixture of hematiteore and limestone as shell layer, were used in the present experiments. CaO concentrationof shell fine was varied in three levels, i.e. 10, 20 and 30 mass% and ratio of shell fine wasvaried in two levels, i.e. 30 and 50 mass%. CaO concentration and ratio of shell fine wereregarded as indices of apparent viscosity and volume of melt formed during heating. The influenceof CaO concentration and the ratio of shell fine on the behavior of large pore formationduring heating were examined by a microscopic observation. The mean diameter and areafraction of pores existed in the assimilated part of specimen were also measured. The resultsobtained were as follows:1) With increasing CaO concentration and the ratio of shell fine, the area fraction and numberof pore were decreased; the suppression of the large pore formation was achieved.2) The decrease in both of the area fraction and num ber of pore depend on the lowering apparentviscosity and increasing volume of melt formed during heating.3) The lowering apparent viscosity of melt is more effective to suppress the formation oflarge pore than increasing volume of melt.4) It is clear that the suppressive effect is resulted from the promotion of coalescence of bubblesdue to the lowering apparent viscosity of melt formed during heating.
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<研究論文>ピソライト鉱石を原料とした焼結鉱に存在する粗大気孔の生成に対する融液性状の影響

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