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Relationship Between Sulfide Capacity and Structure of MnO-SiO2-Al2O3-Ce2O3 System

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Abstract

Sulfide capacity of the MnO-SiO2-Al2O3-Ce2O3 system was measured at 1873 K (1600 °C), and the structural analysis was carried out using micro-Raman spectroscopy to understand the role of Ce2O3 in the sulfur dissolution behavior. Sulfide capacity of the basic melts (MnO/SiO2 = 2.2(±0.14)) decreased with increasing content of Ce2O3 to approx. 4 mol pct, beyond which it increased. Sulfide capacity continuously decreased in the less basic system (MnO/SiO2 = 1.0(±0.15)), whereas it was hardly affected by Ce2O3 in the relatively acidic composition (MnO/SiO2 = 0.3(±0.05)). There was a significant increase in the intensity of Raman band at 600 cm−1 by Ce2O3 addition in high MnO/SiO2 (=2.2) system, which originated from the transition from [(Al,Mn0.5)O4]-tetrahedron to [(Al,Ce)O6]-octahedron due to strong attraction between Al2O3 and Ce2O3. Combining thermodynamic and structural information, the effect of Ce2O3 on the sulfide capacity of Mn-aluminosilicate melts can be explained by the following factors: (1) Activity of MnO in the melts decreased by addition of Ce2O3; (2) Free oxygen was consumed in the structure modification from [(Al,Mn0.5)O4] to [(Al,Ce)O6] unit by addition of Ce2O3; and 3) When the Ce3+ content was greater than critical value (approx. 4 mol pct) in high MnO/SiO2 (=2.54) melts, excess Ce3+ and Mn2+ ions competitively reacted with S2− ions, resulting in an increase of sulfide capacity.

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Acknowledgments

This research was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (Grant Number NRF-2012R1A1A2041774). Furthermore, the authors express the appreciation to Professor KAZUKI MORITA, The University of Tokyo, Japan, for a fruitful discussion in regard of the interaction between Ce2O3 and Al2O3 in oxide melts.

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Authors and Affiliations

  1. Technical Research Center, SeAH Changwon Integrated Specialty Steel (SeAH CSS), Changwon, Korea

    Se Ji Jeong (Graduate Student, Researcher)

  2. Department of Materials Engineering, Hanyang University, Ansan, 426-791, Korea

    Se Ji Jeong (Graduate Student, Researcher), Tae Sung Kim (Graduate Student) & Joo Hyun Park (Professor)

Authors
  1. Se Ji Jeong
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  2. Tae Sung Kim
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  3. Joo Hyun Park
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Correspondence to Joo Hyun Park.

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Manuscript submitted July 28, 2016.

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Jeong, S.J., Kim, T.S. & Park, J.H. Relationship Between Sulfide Capacity and Structure of MnO-SiO2-Al2O3-Ce2O3 System. Metall Mater Trans B 48, 545–553 (2017). https://doi.org/10.1007/s11663-016-0828-1

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