Vapor Pressure Measurements of PbO in Liquid PbO-FeO1.5-CaO-SiO2 and PbO-ZnO-FeO1.5-CaO-SiO2 Slags by Transpiration Method.

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  • MOON Namil
    Graduate Student, Tohoku University
  • HINO Mitsuhisa
    Institute for Advanced Materials Processing, Tohoku University, Aoba–ku, Sendai 980–8577
  • LEE Younghack
    College of Engineering, Chonbuk National University, Chonju 560–756, Korea
  • ITAGAKI Kimio
    Institute for Advanced Materials Processing, Tohoku University, Aoba–ku, Sendai 980–8577

Bibliographic Information

Other Title
  • 流動法によるＰｂＯ‐ＦｅＯ１．５‐ＣａＯ‐ＳｉＯ２系およびＰｂＯ‐ＺｎＯ‐ＦｅＯ１．５‐ＣａＯ‐ＳｉＯ２系スラグ融体中のＰｂＯの蒸気圧測定
  • 流動法によるPbO-FeO1.5-CaO-SiO2系およびPbO-ZnO-FeO1.5-CaO-SiO2系スラグ融体中のPbOの蒸気圧測定
  • リュウドウホウ ニ ヨル PbO-FeO1.5-CaO-SiO2ケイ オヨビ PbO-ZnO-FeO1.5-CaO-SiO2ケイ スラグユウタイ チュウ ノ PbO ノ ジョウキアツ ソクテイ

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Abstract

To obtain the vapor pressure data of PbO in the PbO base slags with the high content of PbO, a transpiration method using a vertical volatilization chamber was developed and the vapor pressures were determined at 1, 423 and 1, 473 K for liquid PbO-FeO1.5-CaO-SiO2 and PbO-ZnO-FeO1.5-CaO-SiO2 slags nearly corresponding to those in the oxidation zone of the QSL lead smelting furnace. For any slag investigated, the activity of PbO was found to present a negative deviation from the Raoultian behavior and the activity coefficient of PbO showed a minimum value at the mole fraction of PbO in the slag with about 0.5. It was found that the acitivity coefficient of PbO increased with increasing Q of the slag, defined by Q = mass % CaO/(mass % SiO2 + mass % CaO). It was also clarified that the activity coefficient of PbO in the slag with ZnO was smaller than that in the slag without ZnO. The observed behaviors were explained qualitatively on the basis of the chemical affinity between PbO and other components in the slag. The partial pressures of various lead components in the gas phase were evaluated using the obtained thermodynamic data and it was suggested that the elemental lead species was predominant in the gas phase corresponding to the oxidation zone of the QSL furnace where the metallic lead phase coexists with the slag phase.

Journal

  • Shigen-to-Sozai

    Shigen-to-Sozai 115 (11), 831-836, 1999

    The Mining and Materials Processing Institute of Japan

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