塩焼き工程における石灰石中不純物の挙動 Behavior of Impurities in Limestones during Calcination with Sodium Chloride

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著者

    • 梅津 芳生 UMETSU Yoshio
    • 岩手大学工学部応用分子化学科 Department of Applied Chemistry and Molecular Science, Faculty of Engineering, Iwate University
    • 成田 榮一 NARITA Eiichi
    • 岩手大学工学部応用分子化学科 Department of Applied Chemistry and Molecular Science, Faculty of Engineering, Iwate University

抄録

A behavior of metal impurities in various limestones during the calcination with sodium chloride has been investigated to clarify the chemical effect of sodium chloride additive in the production of calcium oxide. The calcination of the limestones has been carried out at temperature range from 900 to 1200°C under air (oxidation) or carbon monoxide (reduction) atmosphere. Though a small amount of iron (III) oxide was changed to iron chloride under the oxidizing atmosphere, the removal of iron (II) oxide based on vaporization was not observed. However, under the reducing atmosphere, a large amount of iron (III) oxide was removed as FeCl<SUB>2</SUB>.<BR>When the mixture of the limestone (Fe<SUB>2</SUB>O<SUB>3</SUB> : 0.12%) and sodium chloride with the molar ratio of Fe<SUB>2</SUB>0<SUB>3</SUB> : NaCl=1 : 10 was calcined at 1100°C for 1 h, 41.0% of iron was removed. During the calcination process, sodium chloride was found to change partially Na<SUB>2</SUB>CO<SUB>3</SUB> which being fusible as an eutectic mixture with excess sodium chloride. The other metal impurities in the limestone such as zinc, lead, copper, manganese, chromium were removed as chloride or metal state under the reducing atmosphere depending on each intrinsic m. p., b. p. and vapor pressure. On the other hand, alminium and silicon impurities were not removed and remained in the resulting calcium oxide as aluminosilicates. It was concluded that there are many factors affecting diversely the removal of impurities such as crystal grain size, crack, clay mineral content of the limestone as well as the reaction conditions such as calcination temperature and time, amount of sodium chloride additive and calcination atmosphere.

収録刊行物

  • 無機マテリアル : セッコウ・石灰・セメント・地球環境の科学 = Inorganic materials  

    無機マテリアル : セッコウ・石灰・セメント・地球環境の科学 = Inorganic materials 4(266), 13-19, 1997-01 

    The Society of Inorganic Materials, Japan

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各種コード

  • NII論文ID(NAID)
    10002122282
  • NII書誌ID(NCID)
    AN10455831
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    13407899
  • NDL 記事登録ID
    4107241
  • NDL 雑誌分類
    ZP9(科学技術--化学・化学工業--無機化学・無機化学工業--セラミックス・窯業)
  • NDL 請求記号
    Z17-B79
  • データ提供元
    CJP書誌  NDL  J-STAGE 
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