Influence of Fe on film-forming mechanism of (Cu-Ni-Fe)-xNiFe2O4 composite inert anode for aluminum electrolysis in low temperature electrolyte
LIU Ying1,2, ZHANG Yong-an1, WANG Wei2, LI Dong-sheng2, WANG Jun-wei2, LIANG Yu-dong2
1. State Key Laboratory of Nonferrous Metals and Processes, General Research Institute for Nonferrous Metals, Beijing 100088, China;
2. Zhengzhou Non-ferrous Metals Research Institute Co., Ltd. of CHALCO, Zhengzhou 450041, China
Abstract：Several (Cu-Ni-Fe)-xNiFe2O4(x=50,60,70,80,mass fraction/%) composite inert anodes with different contents of alloy phase were prepared using Cu, Ni, Fe and high-temperature synthetic NiFe2O4 by cold-pressing sintering method. The effect of Fe on the composition and microstructure of the (Cu-Ni-Fe)-xNiFe2O4 composite inert anodes during sintering and electrolysis process was studied. It is found that the redox reaction between Ni/Fe and NiFe2O4 phase occurs, leading to the dissociation and regeneration of NiFe2O4. In addition, the film-forming process and corrosion behavior of the (Cu-Ni-Fe)-xNiFe2O4 anodes were studied through low-temperature aluminium electrolysis test. The results indicate that the cell voltage is stable during electrolysis and the impurities in the produced aluminium are less than 0.7% (mass fraction), which indicates that (Cu-Ni-Fe)-xNiFe2O4 composite inert anode is one of the most promising inert anode materials, and the poor thermal stability of the ceramic anode is expected to be solved.
刘英, 张永安, 王卫, 李冬生, 王俊伟, 梁玉冬. Fe对(Cu-Ni-Fe)-xNiFe2O4复合惰性阳极低温铝电解成膜机制的影响[J]. 材料工程, 2019, 47(2): 107-114.
LIU Ying, ZHANG Yong-an, WANG Wei, LI Dong-sheng, WANG Jun-wei, LIANG Yu-dong. Influence of Fe on film-forming mechanism of (Cu-Ni-Fe)-xNiFe2O4 composite inert anode for aluminum electrolysis in low temperature electrolyte. Journal of Materials Engineering, 2019, 47(2): 107-114.
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