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Dispersion Caused by Carbon Dioxide During Secondary Alumina Dissolution: A Lab-Scale Research

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Abstract

Secondary alumina is the byproduct of dry scrubbing in aluminum smelting. Secondary alumina has superior dissolution characteristics to primary alumina. Secondary alumina dissolves in pieces in molten cryolite, which results in larger contact area and better diffusion kinetics. In this work, the dissolution phenomenon of primary alumina, secondary alumina, and primary alumina doped with sodium carbonate or calcium carbonate (mass ratio = 10:1, 20:1) was observed and compared to estimate carbon-induced dispersion in industrial secondary alumina. Temperature fluctuations during sample dissolution were measured to evaluate the benefits of preheating on alumina dissolution. It was found that carbon mixed in secondary alumina significantly influences the dispersion of alumina particles at the moment of feeding, and thermodynamic analysis also shows that the combustion heat from carbon facilitates dispersion.

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Acknowledgments

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 No. 51074045, 51228401, 51322406), and the China Scholarship Council.

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Authors and Affiliations

  1. Department of Nonferrous Metallurgy, School of Materials and Metallurgy, Northeastern University, Shenyang, 110004, P.R. China

    Youjian Yang (Ph.D. Candidate), Bingliang Gao (Professor), Zhaowen Wang (Professor), Zhongning Shi (Professor), Xianwei Hu (Associate Professor) & Jiangyu Yu (Assistant Engineer)

Authors
  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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  6. Jiangyu Yu
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Corresponding author

Correspondence to Bingliang Gao.

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Manuscript submitted September 25, 2013.

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Yang, Y., Gao, B., Wang, Z. et al. Dispersion Caused by Carbon Dioxide During Secondary Alumina Dissolution: A Lab-Scale Research. Metall Mater Trans B 45, 1150–1156 (2014). https://doi.org/10.1007/s11663-014-0065-4

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