CaO-SiO_2-Fe_tO系スラグを含有する酸化鉄の被還元性に及ぼすスラグ組成ならびに含有量の影響(製銑)

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In the sintering with lower slag ratio, the melt quantity decreases, and the agglomeration do not progress sufficiently. It is necessary to secure the melt quantity by silicate melt mainly composed of Fe_xO-SiO_2 system and to control ideally the composition and the generation place of the melt. In the present study, iron ore sinter is simulated by an iron oxide pellet added with (CaO-)SiO_2-Fe_tO slag particles, and the effects of the slag content, the composition, the holding time at 1573K and the slag particle size on the hydrogen reduction behavior of the iron oxide pellet including (CaO-)SiO_2-Fe_tO slag particles have been investigated at 1173K. In the initial stage of reduction, the fractional reduction is higher when the slag content is higher. With proceeding the reduction, the fractional reduction of the sample with the higher slag content becomes lower than the sample with the lower slag content. The reduction rate decreases with the increase of the slag content. The ratio of the pore area with over 100μm pore size increases with the increase of slag content. On the other hand, the final fractional reduction decreases with the increase of the slag content. From this fact, it is considered that the microporosity under lOOμm is related to the reducibility and becomes an influential factor. On the slag composition, the final fractional reduction of the pellet including Fe_tO-SiO_2 slag is better. This is because that the silicate slag is difficult to permeate nor block up the pore.
社団法人日本鉄鋼協会の論文
2006-09-01

CaO-SiO_2-Fe_tO系スラグを含有する酸化鉄の被還元性に及ぼすスラグ組成ならびに含有量の影響(製銑)

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