Microstructure and electrolysis behavior of self-healing Cu-Ni-Fe composite inert anodes for aluminum electrowinning

Ying Liu; Yong-an Zhang; Wei Wang; Dong-sheng Li; Jun-yi Ma

doi:10.1007/s12613-018-1673-9

Volume 25 Issue 10

Oct. 2018

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文章导航 > 矿物冶金与材料学报（英文） > 2018 > 25(10): 1208-1216

Ying Liu, Yong-an Zhang, Wei Wang, Dong-sheng Li, and Jun-yi Ma, Microstructure and electrolysis behavior of self-healing Cu-Ni-Fe composite inert anodes for aluminum electrowinning, Int. J. Miner. Metall. Mater., 25(2018), No. 10, pp. 1208-1216. https://doi.org/10.1007/s12613-018-1673-9

Cite this article as:

Ying Liu, Yong-an Zhang, Wei Wang, Dong-sheng Li, and Jun-yi Ma, Microstructure and electrolysis behavior of self-healing Cu-Ni-Fe composite inert anodes for aluminum electrowinning, Int. J. Miner. Metall. Mater., 25(2018), No. 10, pp. 1208-1216. https://doi.org/10.1007/s12613-018-1673-9

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研究论文

Microstructure and electrolysis behavior of self-healing Cu-Ni-Fe composite inert anodes for aluminum electrowinning

State Key Laboratory of Non-Ferrous Metals and Processes, General Research Institute for Nonferrous Metals, Beijing 100088, China
Zhengzhou Non-ferrous Metals Research Institute Co. Ltd. of CHALCO, Zhengzhou 450041, China

通讯作者:
Yong-an Zhang E-mail: zhangyongan@grinm.com

中文摘要

The microstructure evolution and electrolysis behavior of (Cu₅₂Ni₃₀Fe₁₈)-xNiFe₂O₄ (x=40wt%, 50wt%, 60wt%, and 70wt%) composite inert anodes for aluminum electrowinning were studied. NiFe₂O₄ was synthesized by solid-state reaction at 950℃. The dense anode blocks were prepared by ball-milling followed by sintering under a N₂ atmosphere. The phase evolution of the anodes after sintering was determined by scanning electron microscopy and energy-dispersive X-ray spectroscopy. The results indicate that a substitution reaction between Fe in the alloy phase and Ni in the oxide phase occurs during the sintering process. The samples were also examined as inert anodes for aluminum electrowinning in the low-temperature KF-NaF-AlF₃ molten electrolyte for 24 h. The cell voltage during electrolysis and the corrosion scale on the anodes were analyzed. The results confirm that the scale has a self-repairing function because of the synergistic reaction between the alloy phase with Fe added and the oxide phase. The estimated wear rate of the (Cu₅₂Ni₃₀Fe₁₈)-50NiFe₂O₄ composite anode is 2.02 cm·a^-1.

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Research Article

Microstructure and electrolysis behavior of self-healing Cu-Ni-Fe composite inert anodes for aluminum electrowinning

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Abstract

Abstract

The microstructure evolution and electrolysis behavior of (Cu₅₂Ni₃₀Fe₁₈)-xNiFe₂O₄ (x=40wt%, 50wt%, 60wt%, and 70wt%) composite inert anodes for aluminum electrowinning were studied. NiFe₂O₄ was synthesized by solid-state reaction at 950℃. The dense anode blocks were prepared by ball-milling followed by sintering under a N₂ atmosphere. The phase evolution of the anodes after sintering was determined by scanning electron microscopy and energy-dispersive X-ray spectroscopy. The results indicate that a substitution reaction between Fe in the alloy phase and Ni in the oxide phase occurs during the sintering process. The samples were also examined as inert anodes for aluminum electrowinning in the low-temperature KF-NaF-AlF₃ molten electrolyte for 24 h. The cell voltage during electrolysis and the corrosion scale on the anodes were analyzed. The results confirm that the scale has a self-repairing function because of the synergistic reaction between the alloy phase with Fe added and the oxide phase. The estimated wear rate of the (Cu₅₂Ni₃₀Fe₁₈)-50NiFe₂O₄ composite anode is 2.02 cm·a^-1.
- aluminum electrolysis;
- inert anode;
- composites;
- aluminum electrowinning;
- corrosion

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References

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Microstructure and electrolysis behavior of self-healing Cu-Ni-Fe composite inert anodes for aluminum electrowinning

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Microstructure and electrolysis behavior of self-healing Cu-Ni-Fe composite inert anodes for aluminum electrowinning

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