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Effect of Chlorine on the Viscosities and Structures of CaO-SiO2-CaCl2 Slags

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Abstract

The viscosities of CaO-SiO2-CaCl2 (CaO/SiO2 = 1.12) slags were measured to elucidate the effect of chlorine with CaCl2 content from 0 to 15 mass pct on the slags at high temperatures, and the Raman spectra of the glassy slags were detected to account for the role of chlorine in modifying the structures of the slags. The viscosity was found to increase with decreasing temperature and to decrease with increasing chlorine content at a given temperature. The critical temperature (T CR) decreased from about 1675 K to 1621 K (1402 °C to 1348 °C) with increasing CaCl2 content from 5 to 15 mass pct, and the activation energy decreased from 226 to 152 kJ/mol with CaCl2 content increasing from 0 to 15 mass pct. Meanwhile, the Raman spectra gradually shifted to lower wavenumber, the fractions of Q 0 and Q 2 units increased and the Q 1 and Q 3 units decreased continuously, and the Q 3/Q 2 ratio generally decreased with increasing the chlorine content in the investigated slags; all of these results above demonstrated the role of network modifier of the chlorine in decreasing the degree of polymerization in the silicon-oxygen tetrahedra.

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Acknowledgments

This work was financially supported by the Key Program of the National Natural Science Foundation of China (No. U1260202), the Natural Science Foundation of China and Baosteel (No. 51134008) and the 111 Project (No. B13004).

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Authors and Affiliations

  1. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, No. 30 Xueyuan Rd, Hadian District, Beijing, 100083, P.R. China

    Cui Wang (Ph.D. Candidate), Jianliang Zhang (Professor), Zhengjian Liu (Associate Professor), Kexin Jiao (Lecturer), Guangwei Wang (Lecturer) & Junqiang Yang (Master Candidate)

  2. State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, No. 30 Xueyuan Rd, Hadian District, Beijing, 100083, P.R. China

    Kuochih Chou (Professor)

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  1. Cui Wang
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  2. Jianliang Zhang
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  5. Guangwei Wang
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Correspondence to Zhengjian Liu.

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Manuscript submitted January 10, 2016.

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Wang, C., Zhang, J., Liu, Z. et al. Effect of Chlorine on the Viscosities and Structures of CaO-SiO2-CaCl2 Slags. Metall Mater Trans B 48, 328–334 (2017). https://doi.org/10.1007/s11663-016-0846-z

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  • DOI: https://doi.org/10.1007/s11663-016-0846-z

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