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RecoveryRecovery of aluminum scrapAluminum scrap has attracted wide attention due to its low energy consumptionLow energy consumption and carbonCarbon emissionEmissions. The current aluminum scrapAluminum scrap recyclingRecycling by remelting process cannot remove alloying elements in the recoveryRecovery process, such that the recycled aluminumAluminum satisfies only the requirements of downgraded use. In order to achieve the purpose of upcycling aluminum scrapAluminum scrap, in this study, typical aluminum scrapAluminum scrap was used as a soluble anodeSoluble anode to purify in NaCl-KCl-Na3AlF6 molten salt system at 710 °C. The liquidus temperature and electrical conductivityElectrical conductivity of the eutectic NaCl-KCl molten salt with different molar concentrations of Na3AlF6 added were determined. The whole electrolytic purificationElectrolytic purification process including the dissolution of anodeAnode and the precipitationPrecipitation of cathode was analyzed. The results show that the liquidus temperature decreased and then rose with the increase of Na3AlF6 concentration, while the trend of electrical conductivityElectrical conductivity was opposite. Most alloying elements in aluminum scrapAluminum scrap could be removed by electrolytic purificationElectrolytic purification with soluble anodeSoluble anode, and the purity of aluminumAluminum obtained on the cathode could reach over 99.8 wt. % under the conditions of electrolysis temperature of 710 °C, cathode current density of 0.5 A/cm2, electrolysis duration of 5 h and Na3AlF6 concentration of 8 mol %.

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Electrolytic Purification of Aluminum Scrap in NaCl-KCl-Na3AlF6 Molten Salt System

  • 会议论文

  • 发表日期：

    2025年

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  • Buju Guo,
  • Yaowu Wang,
  • Wenxiong Dong,
  • Jinbo Qiao

摘要

RecoveryRecovery of aluminum scrapAluminum scrap has attracted wide attention due to its low energy consumptionLow energy consumption and carbonCarbon emissionEmissions. The current aluminum scrapAluminum scrap recyclingRecycling by remelting process cannot remove alloying elements in the recoveryRecovery process, such that the recycled aluminumAluminum satisfies only the requirements of downgraded use. In order to achieve the purpose of upcycling aluminum scrapAluminum scrap, in this study, typical aluminum scrapAluminum scrap was used as a soluble anodeSoluble anode to purify in NaCl-KCl-Na3AlF6 molten salt system at 710 °C. The liquidus temperature and electrical conductivityElectrical conductivity of the eutectic NaCl-KCl molten salt with different molar concentrations of Na3AlF6 added were determined. The whole electrolytic purificationElectrolytic purification process including the dissolution of anodeAnode and the precipitationPrecipitation of cathode was analyzed. The results show that the liquidus temperature decreased and then rose with the increase of Na3AlF6 concentration, while the trend of electrical conductivityElectrical conductivity was opposite. Most alloying elements in aluminum scrapAluminum scrap could be removed by electrolytic purificationElectrolytic purification with soluble anodeSoluble anode, and the purity of aluminumAluminum obtained on the cathode could reach over 99.8 wt. % under the conditions of electrolysis temperature of 710 °C, cathode current density of 0.5 A/cm2, electrolysis duration of 5 h and Na3AlF6 concentration of 8 mol %.