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| Analysis on the Occurrence Forms of Elements at the Interface of Anode Reactions in Aluminum Electrolysis |
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Received:December 09, 2024
Revised:December 11, 2024
Accepted:December 12, 2024
Published Online:August 05, 2025
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| DOI： |
| KeyWord:Aluminum electrolysis; Anode gases; Interface reactions; Generation mechanism; Chemical bond |
| Author | Institution |
| Sun Kena |
Metallurgical Research and Design Institute of BGRIMM Technology Group |
| RUAN Shufeng |
Metallurgical Research and Design Institute of BGRIMM Technology Group |
| Gao Wei |
Metallurgical Research and Design Institute of BGRIMM Technology Group |
| Zhang Yonglu |
Metallurgical Research and Design Institute of BGRIMM Technology Group |
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| Abstract: |
| Laboratory-scale aluminum electrolytic molten salt experiments were carried out, and XPS was used to analyze the residual substances on the surface of the graphite anode after the reaction to obtain information on elemental composition and chemical bonds, thereby inferring the anode reactions occurring at the graphite anode/electrolyte interface. The research results show that under different electrolysis conditions, different types of F—C bonds will be generated on the surface of the graphite anode. As the potential increases, the semi-ionic F—C bonds will continue to discharge and transform into covalent F—C bonds. Due to the dense structure and low electrochemical activity of covalent F—C bonds, the electrode will be passivated when they reach a certain content. Therefore, it is speculated that the generation of PFC gases is controlled by electrochemical reactions and is directly related to the types and quantities of F—C bonds. In addition, when the content of Al2O3 in the molten salt is high, a relatively large number of C—O—C bridge structures will newly form on the surface of the sample. It is speculated that this structure is closely related to the generation of anode gases such as CO2. |
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