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The Formation and Dissolution of Crust Upon Alumina Addition into Cryolite Electrolyte

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Abstract

The properties of the alumina agglomerate/crust formed upon smelting grade alumina feeding and the corresponding dissolution rates in cryolite electrolyte were studied using a suspended weighing device. A series of experiments was designed to investigate the dissolution rate of the crust at various temperatures and the effects of initial alumina concentration in the electrolyte on the formation process and properties of the crust. Initial results showed that under experimental non-stirring conditions, a large proportion as high as 54–64% of the fed alumina participated in the formation of the crust upon feeding at 1233–1238 K (960–965°C). The dissolution rate of the crust decreased greatly with the increase of initial alumina concentration and the decrease of operating temperature. The mass of the crust increased significantly at high initial alumina concentrations and decreased temperature, while the alumina content of the crust showed a slight decreasing trend. Other parameters of the crust such as volume density and gas-filling fraction were also measured. The influence of physical stirring on alumina dissolution rate was also discussed.

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Acknowledgements

The authors would like to express their gratitude for the financial support provided by the National Key Technology Research and Development Program of the Ministry of Science and Technology of China (Grant No. 2012BAE08B01), the National Natural Science Foundation of China (Grant Nos. 51074045, 51074046, 51228401, 51322406, 51434005, 51474060), the NEU foundation (No. N130402011).

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Authors and Affiliations

  1. School of Materials and Metallurgy, Northeastern University, Mail Box 117, Shenyang, China

    Youjian Yang, Bingliang Gao, Zhaowen Wang, Zhongning Shi & Xianwei Hu

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  1. Youjian Yang
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  2. Bingliang Gao
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  3. Zhaowen Wang
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  4. Zhongning Shi
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  5. Xianwei Hu
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Correspondence to Bingliang Gao.

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Yang, Y., Gao, B., Wang, Z. et al. The Formation and Dissolution of Crust Upon Alumina Addition into Cryolite Electrolyte. JOM 67, 2170–2180 (2015). https://doi.org/10.1007/s11837-015-1525-2

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  • DOI: https://doi.org/10.1007/s11837-015-1525-2

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