鉄鉱石焼結層内における鉄系凝結材の酸化反応に及ぼす酸素分圧の影響

研究成果: Article査読

抄録

In the sintering process of iron ores, coke breeze is utilized as a main agglomeration agent. Its replacement with iron-bearing materials such as metallic iron scraps and magnetite ore seem to be a promising way to reduce CO2 emissions. When using iron-bearing materials together with coke breeze, however, their oxidation reaction appears to be suppressed, since coke combustion tends to decrease in oxygen partial pressure. Therefore, it is necessary to understand the effect of oxygen pressure on the oxidation behavior of the iron-bearing materials. In this study, the oxidation experiments of metallic iron were carried out under the different oxygen partial pressure. A thin plate sample of metallic iron was heated up to the holding temperature, 1200°C, under N2 atmosphere. Then, the atmosphere was changed to the oxygen partial pressure of 0.001 - 0.21 atm, which was controlled by using N2 or CO2 gas mixture. Oxidation ratio and the thickness of wustite layer formed through the oxidation of metallic iron follows a parabolic manner under PO2 = 0.21 atm. The thickness of wustite layer decreases after 300 s under PO2 = 0.21 atm, while the thicknesses of magnetite and hematite layers increase. It appears that the rate-controlling step changes when all metallic iron is oxidized to wustite. Under the condition of PO2 = 0.01 atm, only wustite layer is observed and the oxidation proceeds faster in CO2 base than in N2. It implies that O2 consumed by oxidation reaction is quickly supplied by the decomposition reaction of CO2 gas.

寄稿の翻訳タイトルInfluence of Oxygen Partial Pressure on Oxidation Reaction of Iron-bearing Materials in Iron Ore Sintering Bed
本文言語Japanese
ページ(範囲)431-438
ページ数8
ジャーナルTetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan
107
6
DOI
出版ステータスPublished - 2021 6 1

Keywords

  • CO gas
  • High temperature oxidation
  • Metallic iron
  • Oxygen partial pressure
  • Wustite

ASJC Scopus subject areas

  • 凝縮系物理学
  • 物理化学および理論化学
  • 金属および合金
  • 材料化学

フィンガープリント

「鉄鉱石焼結層内における鉄系凝結材の酸化反応に及ぼす酸素分圧の影響」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

引用スタイル