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Resource Recovery of Aluminum Electrolysis Spent Carbon Anode by Phase Transformation Roasting—Water Leaching Process
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Shuang SHENG1, Lutong MA2, 3, Yan LIN2, 3, 4
Hydrometallurgy of China | 2025, 44(6) : 783 - 790
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Hydrometallurgy of China | 2025, 44(6): 783-790
• Experiment Research •
Resource Recovery of Aluminum Electrolysis Spent Carbon Anode by Phase Transformation Roasting—Water Leaching Process
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Shuang SHENG1, Lutong MA2, 3, Yan LIN2, 3, 4
Affiliations
  • 1.Hechi Institute of Science and Technology Information, Hechi　547000, China
  • 2.Faculty of Metallurgy and Energy Engineering, Kunming University of Science and Technology, Kunming　650093, China
  • 3.Yunnan Sino-Laos International Joint R&D Center of Analysis and Technological Innovation for Energy, Mineral and Metallurgy, Kunming　650093, China
  • 4.State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Kunming　650093, China
Published: 2025-12-20 doi: 10.13355/j.cnki.sfyj.2025.06.010
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Extracting fluorine from aluminium electrolysis spent carbon anode by phase transformation roasting—water leaching process was studied. The effects of various factors during phase transformation roasting and water leaching on fluoride leaching rate were investigated. The results indicate that under the optimal conditions of alkali fusion temperature of 700 ℃, alkali fusion time of 2 h, alkali-to-material mass ratio of 1.25, insoluble cryolite is transformed into soluble sodium fluoride and sodium meta-aluminate phases. Under the optimal conditions of water leaching temperature of 65 ℃, liquid volume to solid mass ratio of 22/1, water leaching time of 2 h, the fluorine leaching rate achieve 95.86%. XRD analysis of the leached residue reveal that the remaining fluoride existed as calcium fluoride. The soluble fluorine mass concentration in the residue is 48 mg/L, which can meet the harmless requirements. The harmless and resourceful recovery of carbon residue can be achieved by converting the fluoride occurrence form through calcination and combining it with a one-step water leaching process. The method offers advantages such as a simple process flow, rapid reaction kinetics, high treatment efficiency, and promising industrial application prospects.

spent carbon anode  /  aluminum electrolysis  /  fluorine  /  extraction  /  phase transformation  /  roasting  /  water leaching  /  harmless
盛双, 马路通, 林艳. 相变转化焙烧—水浸资源化回收铝电解炭渣试验研究. 湿法冶金, 2025 , 44 (6) : 783 -790 . DOI: 10.13355/j.cnki.sfyj.2025.06.010
Shuang SHENG, Lutong MA, Yan LIN. Resource Recovery of Aluminum Electrolysis Spent Carbon Anode by Phase Transformation Roasting—Water Leaching Process[J]. Hydrometallurgy of China, 2025 , 44 (6) : 783 -790 . DOI: 10.13355/j.cnki.sfyj.2025.06.010
Appendix
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Year 2025 volume 44 Issue 6
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Article Info
doi: 10.13355/j.cnki.sfyj.2025.06.010
  • Receive Date：2025-03-11
  • Online Date：2026-09-28
  • Published：2025-12-20
Article Data
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  • Received：2025-03-11
Funding
Affiliations
    1.Hechi Institute of Science and Technology Information, Hechi　547000, China
    2.Faculty of Metallurgy and Energy Engineering, Kunming University of Science and Technology, Kunming　650093, China
    3.Yunnan Sino-Laos International Joint R&D Center of Analysis and Technological Innovation for Energy, Mineral and Metallurgy, Kunming　650093, China
    4.State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Kunming　650093, China
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表12种不同金属材料的力学参数
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Family		 属数
Number of
genus		 种数
Number of
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Percentage of
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鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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