硫化亜鉛の窒素気流下における金属鉄による還元揮発反応速度 Reduction Kinetics of Zinc Sulfide with Metallic Iron under Nitrogen Stream

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著者

    • 伊藤 聰 ITOH Satoshi
    • 東北大学 大学院工学研究科金属工学 Department of Metallurgy, Graduate School of Engineering, Tohoku University
    • 菊池 淳 KIKUCHI Atsushi
    • 東北大学 大学院工学研究科金属工学 Department of Metallurgy, Graduate School of Engineering, Tohoku University

抄録

Zinc sulfide is directly reduced to zinc gas with metallic iron. In such a reaction the sulfur is fixed as pyrrhotite, and then it would be expected that roasting and/or sintering zinc sulfide would not be required. From this point of view, reaction experiments of zinc sulfide reduction with metallic iron have been conducted under nitrogen stream in the temperature range of 1,180∼1,240 K. A shrinking unreacted-core model has been applied to analyze the reaction data, based on the observation of cross section of partially reacted sample. In the model, the following steps were considered: a chemical reaction, a diffusion of zinc gas away through the product layer, and a diffusion of zinc gas through gas film. Reaction rate constant kc and effective diffusivity De determined were expressed as follows: kc/mol·m-2·s-1 = exp {-124.9 × 103/(RT) + 6.386} De/m2·s-1 = exp (-58.57 × 103/T + 37.41) where R : gas constant (J·mol-1 ·K-1 ), T : temperature (K). The activation energy of the reaction was 125 kJ·mol-1 . The calculated reduction curves using the rate parameters obtained finely reproduced the experimental data. The reaction proceeds faster with increasing temperature. The reaction is controlled by the diffusion of zinc gas away through the product layer at a lower temperature, while at a higher temperature, both the diffusion of zinc gas away through the product layer and the chemical reaction determine the reaction. At temperature of only 60 K higher, the reaction rate of zinc sulfide with metallic iron under nitrogen stream was comparable with that under vacuum.

収録刊行物

  • 資源と素材 : 資源・素材学会誌 : journal of the Mining and Materials Processing Institute of Japan

    資源と素材 : 資源・素材学会誌 : journal of the Mining and Materials Processing Institute of Japan 114(10), 733-738, 1998-09-25

    The Mining and Materials Processing Institute of Japan

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各種コード

  • NII論文ID(NAID)
    10002468160
  • NII書誌ID(NCID)
    AN10062646
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    09161740
  • NDL 記事登録ID
    4574121
  • NDL 雑誌分類
    ZP41(科学技術--金属工学・鉱山工学)
  • NDL 請求記号
    Z17-315
  • データ提供元
    CJP書誌  CJP引用  NDL  J-STAGE 
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