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Thermodynamics and Structure of CaO-Al2O3-3 Mass Pct B2O3 Slag at 1773 K (1500 °C)

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Abstract

Activity values of Al2O3 in CaO-Al2O3-B2O3 systems at 1773 K (1500 °C) were determined experimentally using a gas–copper–slag equilibrium technique. The oxygen partial pressure was controlled by C/CO equilibrium. A negative deviation from ideality was found in measured activity of Al2O3. The activity coefficient of Al2O3 decreases with the increase of CaO/Al2O3 ratio. To interpret the variation of Al2O3 activity with composition, structures of CaO-Al2O3-B2O3 glassy slag were investigated by using Raman spectroscopy. It was found that the number of bridging oxygen decreases with increasing CaO/Al2O3 ratio. With increase of CaO content, the aluminate network was gradually depolymerized, which corresponds to the decrease of the activity coefficient of Al2O3.

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Authors and Affiliations

  1. State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing, 100083, China

    Qifeng Shu (Professor), Pengfei Li (Master students), Xiang Zhang (Master students) & Kuochih Chou (Professor)

  2. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing, 100083, China

    Qifeng Shu (Professor), Pengfei Li (Master students), Xiang Zhang (Master students) & Kuochih Chou (Professor)

Authors
  1. Qifeng Shu
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  2. Pengfei Li
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  3. Xiang Zhang
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  4. Kuochih Chou
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Correspondence to Qifeng Shu.

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Manuscript submitted January 25, 2016.

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Shu, Q., Li, P., Zhang, X. et al. Thermodynamics and Structure of CaO-Al2O3-3 Mass Pct B2O3 Slag at 1773 K (1500 °C). Metall Mater Trans B 47, 3527–3532 (2016). https://doi.org/10.1007/s11663-016-0781-z

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  • DOI: https://doi.org/10.1007/s11663-016-0781-z

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