Fibrous Growth of Iron Precipitates during Reduction of Iron Ores by CO Gas

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  • KOBAYASHI Mutsuhiro
    Institut für Eisenhüttenkunde, Rhein.-Westf. Technische Hochschule, Now Faculty of Engineering, Tokyo Institute of Technology
  • GUDENAU Heinrich W.
    Institut für Eisenhüttenkunde, Rhein.-Westf. Technische Hochschule
  • BURCHARD Willy G.
    Institut für Eisenhüttenkunde, Rhein.-Westf. Technische Hochschule
  • SCHAEFER H. Christian
    Institut für Eisenhüttenkunde, Rhein.-Westf. Technische Hochschule, Now Hoesch Hohenlimburg AG

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Other Title
  • 鉄鉱石のCOガス還元時における繊維状金属鉄の成長
  • テッコウセキ ノ CO ガス カンゲンジ ニ オケル センイジョウ キンゾク

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Abstract

Some iron ores were reduced by CO gas in a modified scanning electron microscope equipped with a temperature and gas control; iron precipitates during the reduction were directly observed. Growing mechanism of such precipitates was discussed on their growth in vertical and horizontal directions: the vertical growth is caused by precipitation of supersaturated iron ions under an iron nucleus, which is consequently pushed out toward a free space; while the horizontal one by precipitation of iron ions at a three-phase boundary of precipitated iron, wustite and gas where they were produced. The typical fibrous iron was represented as the result of predominant vertical growth. Very long, fine and dense fibrous iron which appeared in a sulfur-bearing atmosphere was speculated to be attributed to inhibition of the sulfur from the three-phase boundary reaction.

Journal

  • Tetsu-to-Hagane

    Tetsu-to-Hagane 71 (9), 1102-1109, 1985

    The Iron and Steel Institute of Japan

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