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Insights into the Dissolution Behavior of CaO and Mass Transfer of Oxide Ions in Molten CaCl2

  • Topical Collection: 2023 Metallurgical Processes Workshop for Young Scholars
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Abstract

This study focuses on understanding the behavior of oxide ions (O2–) in molten CaCl2, which is important for applications in molten salt electrolysis. The dissolution mechanism of solid CaO and mass transfer characteristics of O2– in molten CaCl2 were investigated through comprehensive chemical analysis. The results revealed that the incongruently melting compound in the CaCl2–CaO system is Ca4OCl6 (CaO·3CaCl2), with a peritectic point observed at 19 mol pct of CaO and 1104 K. The previously reported compounds Ca3OCl4 (CaO·2CaCl2) and Ca5OCl8 (CaO·4CaCl2) were never detected, while only Ca4OCl6 (CaO·3CaCl2) was observed under air-tight conditions. The dissolution behavior of solid CaO in molten CaCl2 is highly temperature dependent, with a critical threshold identified at 1104 K. Below this temperature, CaO reacts with CaCl2 to form Ca4OCl6, which subsequently dissociates into simple ions (Ca2+, Cl–, and O2–). Above 1104 K, CaO directly dissociates to produce O2–. Although temperature influences the formation and dissociation of Ca4OCl6, it has minimal impact on the dissociation of CaO and the mass transfer of O2– in the melt.

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Acknowledgments

The authors appreciate Dr. Zhong Chen, Ms. Yuan Cheng of the Instrumentation and Service Center for Molecular Sciences at Westlake University for the assistance in the Raman measurement, and Dr. Yin Nie of the Instrumentation and Service Center for Physical Sciences at Westlake University for the assistance in the sample characterization. This work was partially supported by Research Centre for Industries of the Future (RCIF) at Westlake University.

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  1. Zhejiang University, Hangzhou, 310058, Zhejiang, P.R. China

    Chenlu Lin

  2. School of Engineering, Westlake University, 600 Dunyu Road, Hangzhou, 310030, Zhejiang, P.R. China

    Chenlu Lin & Xiao Yang

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  1. Chenlu Lin
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Lin, C., Yang, X. Insights into the Dissolution Behavior of CaO and Mass Transfer of Oxide Ions in Molten CaCl2. Metall Mater Trans B (2024). https://doi.org/10.1007/s11663-024-03123-0

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