FeO-SiO<SUB>2</SUB>系スラグ粉末の被還元性に及ぼすCaO添加の影響

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タイトル別名
  • Effect of CaO Addition on the Reducibility of FeO-SiO<SUB>2</SUB> Based Slag Powder
  • 高温プロセス基盤技術 FeO-SiO2系スラグ粉末の被還元性に及ぼすCaO添加の影響
  • コウオン プロセス キバン ギジュツ FeO SiO2ケイ スラグ フンマツ ノ ヒカンゲンセイ ニ オヨボス CaO テンカ ノ エイキョウ

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抄録

Recently, it is strongly desired to lower slag content of iron are sinter. In the sintering of the low slag ratio, one of the problems is the decrease of melt, which is needed to agglomerate the iron ores. As one of the methods to solve the problem, the use of silicate melt mainly composed of FexO-SiO2 is considered. However, the reducibility of the sinter tends to become worse by increasing FexO content. In the present study, the method is examined to improve the reducibility by adding CaO in the silicate melt and by precipitating the mineral phases composed of CaO and SiO2. In the examination, it is important to know the reducibility of FexO in CaO-SiO2-FexO slag. The hydrogen reduction rate of FexO in the formed slag and the precipitated phases by the addition of CaO to FexO-SiO2 melt at 1573K was measured at 1173K; the effect of CaO on the reducibility of FexO in CaO-SiO2-FexO slag has been investigated. From the results, it is found that the composition of the equilibrated slag at 1573K largely affects the reducibility of the slag at 1173K. The reducibility is improved by the precipitation of 2CaO SiO2 after CaO addition. The reducibility of both 2FeO·SiO2 and CaO ·FeO ·SiO2 are very low. Accordingly, it is important to prevent the formation of 2FeO SiO2 and CaO· FeO ·SiO2 to attain the higher final fractional reduction. The reducibility of the slag containing 5 mass% Al2O3 is a little better than that of the Al2O3-free slag, and the dependence of the reducibility on slag composition shows the same tendency as that of the Al2O3-free slag.

収録刊行物

  • 鉄と鋼

    鉄と鋼 89 (5), 559-564, 2003

    一般社団法人 日本鉄鋼協会

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