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Roles of Electrolyte Characterization on Bauxite Electrolysis Desulfurization with Regeneration and Recycling

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Abstract

The recycling of NaCl used as supporting electrolyte for bauxite electrolysis was carried out in this study. The electrolyte was regenerated by adding anhydrous CaCl2 into the solution after filtration, and effects of electrolyte characterization on bauxite electrolysis were examined by observing the change in desulfurization ratio and cell voltage. The results indicated that the desulfurization ratio increased with increasing recycling times of electrolyte. In the meantime, the increase in recycling times has led to the decrease in pH value as well as the increase in Fe ion concentration in the electrolyte, which were the main reasons for the increase in the desulfurization ratio with increasing recycling of electrolyte. The pH value of electrolyte after second electrolysis was lower than 1.5, and the desulfurization ratio increased obviously due to the increase in Fe3+ concentration and suppression of jarosite formation. The increase in Ca2+ concentration did not apparently change desulfurization ratio and anode surface activity. However, with Ca2+ addition, the cathode surface was covered by CaSO4·nH2O, thus resulting in the increase of cell voltage.

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Acknowledgment

This work is financially supported by the Natural Science Foundation of China under a Grant 51004090, 51474198, and Youth Innovation Promotion Association, CAS (2015036).

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Authors and Affiliations

  1. National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, 100190, P.R. China

    Xuzhong Gong (Associate Professor), Zhi Wang (Professor), Siyuan Zhuang (Engineer), Dong Wang (Assistant Professor), Yuhua Wang (Engineer) & Mingyong Wang (Doctor, Associate Professor)

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  1. Xuzhong Gong
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  2. Zhi Wang
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  3. Siyuan Zhuang
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  4. Dong Wang
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Correspondence to Xuzhong Gong or Mingyong Wang.

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Manuscript submitted January 8, 2016.

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Gong, X., Wang, Z., Zhuang, S. et al. Roles of Electrolyte Characterization on Bauxite Electrolysis Desulfurization with Regeneration and Recycling. Metall Mater Trans B 48, 726–732 (2017). https://doi.org/10.1007/s11663-016-0841-4

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