Composition Region fo Homogeneous Liquid Phase in Lead-Containing Slags Related to QSL Process.
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- MOON Namil
- Grraduate Student, Tohoku University, Aoba–ku, Sendai 980–8577
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- HINO Mitsuhisa
- Institute for Advanced Materials Processing, Tohoku University, Aoba–ku, Sendai 980–8577
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- LEE Younghack
- College of Engineering, Chonbuk National University, Chonju 560–756, Korea
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- ITAGAKI Kimio
- Institute for Advanced Materials Processing, Tohoku University, Aoba–ku, Sendai 980–8577
Bibliographic Information
- Other Title
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- 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
- 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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Abstract
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.
Journal
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- Shigen-to-Sozai
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Shigen-to-Sozai 115 (4), 263-268, 1999
The Mining and Materials Processing Institute of Japan
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Details 詳細情報について
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- CRID
- 1390001206016431232
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- NII Article ID
- 10002469534
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- NII Book ID
- AN10062646
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- COI
- 1:CAS:528:DyaK1MXjtVOls7c%3D
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- ISSN
- 18806244
- 09161740
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- NDL BIB ID
- 4728218
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- Text Lang
- ja
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed