ＱＳＬ法に関連する鉛含有スラグの均一融体組成域について

DOI Web Site 被引用文献1件 参考文献8件
  • 文 南日
    Grraduate Student, Tohoku University, Aoba–ku, Sendai 980–8577
  • 日野 光久
    Institute for Advanced Materials Processing, Tohoku University, Aoba–ku, Sendai 980–8577
  • 李 龍鶴
    College of Engineering, Chonbuk National University, Chonju 560–756, Korea
  • 板垣 乙未生
    Institute for Advanced Materials Processing, Tohoku University, Aoba–ku, Sendai 980–8577

書誌事項

タイトル別名
  • Composition Region fo Homogeneous Liquid Phase in Lead-Containing Slags Related to QSL Process.
  • QSLホウ ニ カンレン スル ナマリ ガンユウ スラグ ノ キンイツユウタイ ソセイイキ ニ ツイテ

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抄録

As a fundamental study to control compositions of the slag in the oxidation zone of a QSL lead smelting furnace, phase equilibrium between the metallic lead and the PbO-FeOx-CaO-SiO2 or PbO-FeOx-CaO-SiO2-ZnO slag was investigated at 1,323∼1,523 K and a composition region of the homogeneous liquid slag phase and the composition and chemical formula of solid phases in the slag coexisting with the liquid phase were determined. The PbO-FeOx-CaO-SiO2 slag with Q (= mass % CaO/(mass % CaO + mass %SiO2)) of 0.4 is completely fusible at 1,423 K when the mole fraction ratio of FeOx , R, defined as R = NFeOx /(NFeOx NCaO + NSiO2 ), is around 0.4, and departure from this value gives rise to a solid-liquid two phase region in the range of the low PbO content. This result indicates that the QSL process, which is operated practically with R of about 0.4, is quite reasonable. Solubility of ZnO in the PbO-FeOx-CaO-SiO2-ZnO slag with Q = 0.4 and R = 0.4 at 1,423 K decreases with increasing PbO content in the composition range between 0 and 18 mol % PbO, then increases in the range between 18 and 33 mol % PbO, and finally becomes stagnant at about 18 mol % ZnO in the composition range above 33 mol % PbO. This result has an important meaning for the QSL operation using a charge with a high content of zinc. Hence, it is considered that precautious control of the PbO content in the slag is required for avoiding formation of a solid phase in the slag.

収録刊行物

  • 資源と素材

    資源と素材 115 (4), 263-268, 1999

    一般社団法人 資源・素材学会

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