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A large amount of spent pot liningSpent pot lining (SPL) is produced after aluminumAluminum electrolytic cell failure or after the end of its life. SPL is considered to be a hazardous material because it contains significant concentrations of soluble cyanides and fluoridesFluoride. A process of vacuum distillationVacuum distillation for separation and recoveryRecovery of SPL was studied. An industrial-grade vacuum resistance furnaceFurnace with a processingProcessing capacity of six tons and a collection device for collecting distillation products was built. The fluorideFluoride electrolyteElectrolyte, carbonCarbon, alkali metalMetals and refractories in the spent pot liningSpent pot lining were separated and recovered after treatment in the furnaceFurnace that used the spent cathode carbonCarbon block granules as heating material. Subsequently, aluminum fluorideAluminum fluoride, lithium carbonate and potassium sulfate were produced by further processingProcessing of distilled fluorideFluoride salts.

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Separation and Recovery of Fluoride, Carbon, Alkali Metal Oxides and Refractories with Vacuum Distillation Process from Aluminum Electrolytic Cell Spent Pot Lining

  • 会议论文

  • 发表日期：

    2025年

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  • Feng Naixiang,
  • DiYuezhong,
  • Wang Yaowu,
  • Peng Jianping,
  • Dong Wenxiong,
  • Guo Buju,
  • Huang Jianbin,
  • Hu Zhibiao

摘要

A large amount of spent pot liningSpent pot lining (SPL) is produced after aluminumAluminum electrolytic cell failure or after the end of its life. SPL is considered to be a hazardous material because it contains significant concentrations of soluble cyanides and fluoridesFluoride. A process of vacuum distillationVacuum distillation for separation and recoveryRecovery of SPL was studied. An industrial-grade vacuum resistance furnaceFurnace with a processingProcessing capacity of six tons and a collection device for collecting distillation products was built. The fluorideFluoride electrolyteElectrolyte, carbonCarbon, alkali metalMetals and refractories in the spent pot liningSpent pot lining were separated and recovered after treatment in the furnaceFurnace that used the spent cathode carbonCarbon block granules as heating material. Subsequently, aluminum fluorideAluminum fluoride, lithium carbonate and potassium sulfate were produced by further processingProcessing of distilled fluorideFluoride salts.