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High Temperature Materials and Processes

Editor-in-Chief: Fukuyama, Hiroyuki

Editorial Board: Waseda, Yoshio / Fecht, Hans-Jörg / Reddy, Ramana G. / Manna, Indranil / Nakajima, Hideo / Nakamura, Takashi / Okabe, Toru / Ostrovski, Oleg / Pericleous, Koulis / Seetharaman, Seshadri / Straumal, Boris / Suzuki, Shigeru / Tanaka, Toshihiro / Terzieff, Peter / Uda, Satoshi / Urban, Knut / Baron, Michel / Besterci, Michael / Byakova, Alexandra V. / Gao, Wei / Glaeser, Andreas / Gzesik, Z. / Hosson, Jeff / Masanori, Iwase / Jacob, Kallarackel Thomas / Kipouros, Georges / Kuznezov, Fedor


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Open Access
Online
ISSN
2191-0324
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Volume 32, Issue 3

Issues

A Thermodynamic Model for Evaluation of Mass Action Concentrations of Ce2O3-contained Slag Systems Based on the Ion and Molecule Coexistence Theory

Chengchuan Wu
  • Corresponding author
  • State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China
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/ Guoguang Cheng
  • State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China
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/ Hu Long
  • State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China
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/ Xiaohong Yang
  • State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China
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Published Online: 2013-06-15 | DOI: https://doi.org/10.1515/htmp-2012-0119

Abstract

According to the ion and molecule coexistence theory (IMCT) for molten slags and corresponding phase diagrams, a thermodynamic model for the evaluation of mass action concentrations (designated by Ni for structure unit i) for Ce2O3-Al2O3, CaO-Al2O3-Ce2O3 and CaO-Al2O3-SiO2-Ce2O3 slag systems has been formulated. The results show that when the mole fraction of Ce2O3 is at 0.49 in the binary slag, the mass action concentration of Ce2O3·Al2O3 achieves its maximum value 0.90. In a composition area of CaO/Al2O3 (mass fraction ratio) from 0.7 to 1.5 and Ce2O3 content (mass fraction) from 0 to 45% of the ternary slag at 1773 K, the results show that trends of calculated NAl2O3 are in good agreement with reported measured trends of aAl2O3. The iso-curves of NCe2O3 and NCaO are also drawn from the calculated results. A thermodynamic model of the equilibrium between 55.83%CaO-23%Al2O3-11.17%SiO2-10%Ce2O3 quaternary slag and molten steel containing aluminum has been further discussed. Results indicate that certain content of Ce would be dissolved in steel, which increases with the increasing of temperature and aluminum content, and when the aluminum content is 0.02%, the corresponding cerium content is in the range of 1.87 to 13.30 ppm at 1873 K. In summary, using Ce2O3 to replace Al2O3 can effectively reduce NAl2O3, certain content of Ce can dissolved in steel.

Keywords: CaO-Al2O3-Ce2O3; CaO-Al2O3-SiO2-Ce2O3; coexistence theory; mass action concentration; thermodynamic model

About the article

Received: 2012-08-01

Accepted: 2012-11-02

Published Online: 2013-06-15

Published in Print: 2013-06-14


Citation Information: High Temperature Materials and Processes, Volume 32, Issue 3, Pages 207–214, ISSN (Online) 2191-0324, ISSN (Print) 0334-6455, DOI: https://doi.org/10.1515/htmp-2012-0119.

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