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Formation and Dissolution of Crust Upon Alumina Addition into Cryolite Electrolyte (II)

  • Primary Aluminum Production Chain: Bauxite-Alumina-Electrode-Reduction
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Abstract

The crusting/agglomerating behavior and heat transfer process upon feeding of smelting-grade alumina into aluminum electrolyte were investigated using a suspended weighing device. The influence of several feeding conditions on agglomerate formation and the heat transfer process, including the operating temperature (1173 K and 1233 K), feeding amount (5 g or 10 g alumina into 500 g electrolyte), and alumina preheating temperature (293 K and 773 K), was also analyzed. The results revealed that the mass of agglomerate was largely dependent on the feeding quantity, while the alumina content in the agglomerate stabilized at approximately 35%. Higher electrolyte temperature benefits the dissolution process in several ways: increasing the proportion of fast dissolution alumina, inhibiting agglomerate formation, and enhancing the agglomerate dissolution rate. The properties of the agglomerate were characterized, and surface microscopy revealed further details about its formation process.

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Acknowledgements

The authors would like to acknowledge financial support from the Fundamental Research Funds for the Northeastern University (Grant No. N172503015) and the National Natural Science Foundation of China (Grant Nos. 51804069, 51529401, 51434005, 51474060).

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Authors and Affiliations

  1. School of Metallurgy, Northeastern University, Mailbox 117, Shenyang, China

    Youjian Yang, Youcai Li, Yipeng Huang, Bingliang Gao, Xianwei Hu, Zhaowen Wang, Wenju Tao, Fengguo Liu, Zhongning Shi & Jiangyu Yu

  2. Key Laboratory for Ecological Metallurgy of Multimetallic Mineral (Northeastern University), Ministry of Education, Shenyang, China

    Youjian Yang, Yipeng Huang, Bingliang Gao, Xianwei Hu, Zhaowen Wang, Wenju Tao, Fengguo Liu, Zhongning Shi & Jiangyu Yu

  3. School of Materials and Engineering, Tianjin University, Tianjin, China

    Youcai Li

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  1. Youjian Yang
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  2. Youcai Li
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  3. Yipeng Huang
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  4. Bingliang Gao
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  5. Xianwei Hu
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  6. Zhaowen Wang
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  7. Wenju Tao
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  8. Fengguo Liu
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  9. Zhongning Shi
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  10. Jiangyu Yu
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Correspondence to Youjian Yang.

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Yang, Y., Li, Y., Huang, Y. et al. Formation and Dissolution of Crust Upon Alumina Addition into Cryolite Electrolyte (II). JOM 71, 485–491 (2019). https://doi.org/10.1007/s11837-018-3251-z

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  • DOI: https://doi.org/10.1007/s11837-018-3251-z

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