Methodological Review of Methods and Technology for Utilization of Spent Carbon Cathode in Aluminum Electrolysis

Liuzhou Zhou, Zhen Yao, Ke Sun, Zhongliang Tian, Jie Li () and Qifan Zhong ()
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Liuzhou Zhou: School of Metallurgy and Environment, Central South University, Changsha 410083, China
Zhen Yao: School of Materials and Architectural Engineering, Guizhou Normal University, Guiyang 550025, China
Ke Sun: School of Metallurgy and Environment, Central South University, Changsha 410083, China
Zhongliang Tian: School of Metallurgy and Environment, Central South University, Changsha 410083, China
Jie Li: School of Metallurgy and Environment, Central South University, Changsha 410083, China
Qifan Zhong: School of Metallurgy and Environment, Central South University, Changsha 410083, China

Energies, 2024, vol. 17, issue 19, 1-26

Abstract: Spent carbon cathode (SCC) is one of the major hazardous solid wastes generated during the overhaul of electrolysis cells in the aluminum production process. SCC is not only rich in carbon resources but also contains soluble fluoride and cyanide, which gives it both recycling value and significant leaching toxicity. In this study, we explore the properties, emissions, and disposal strategies for SCC. Pyrometallurgy involves processes such as vacuum distillation, molten salt roasting, and high-temperature roasting. Hydrometallurgy describes various methods used to separate valuable components from leachate and prepare products. Collaborative disposal plays a positive role in treating SCC alongside other solid wastes. High-value utilization provides an approach to make full use of high-purity carbon-based materials. Finally, we analyze and summarize future prospects for the disposal of SCC. This study aims to contribute to the large-scale treatment and resource utilization of SCC while promoting circular economy principles and green development initiatives.

Keywords: aluminum electrolysis; spent carbon cathode; detoxification; resource utilization (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
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