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Sodium removal from molten aluminumAluminum is critical for maintaining product qualityQuality, yet conventional fluxing methods generate solid waste and harmful emissionsEmissions. The present study evaluates a non-reactive method that combines vacuum-assisted evaporation and electromagnetic stirringElectromagnetic stirring (EMS) to reduce sodium content without flux additives. A laboratory-scale system was designed and built to operate at 750 °C and 40 mbar. Artificial Al–Na alloys with targeted sodium levels of 50, 125, and 200 ppm were produced by alloying pure aluminumAluminum with elemental sodium, and treatment cycles of 2.5 min were applied. Sodium concentrations were determined before and after treatment using microwave plasma atomic emissionEmissions spectroscopy (MP-AESAnode Effect (AE)), with simultaneous monitoring of melt temperature, pressure, and mass. The process achieved sodium removal efficiencies exceeding 85% in several trials, with EMS promoting more uniform sodium transport within the melt. Final sodium concentrations consistently stabilized near 30 ppm, indicating an operational lower limit under the tested conditions. While the detailed mechanism requires further investigation, the results demonstrate that vacuum-assisted evaporation combined with EMS offers a promising physical alternative to conventional flux-based sodium removal from molten aluminumAluminum.

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Preliminary Evaluation of Sodium Removal from Molten Aluminum by Vacuum-Assisted Evaporation and Electromagnetic Stirring

  • 会议论文

  • 发表日期：

    2026年

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  • Mohammad Ibrahim,
  • Erlend Mår Hannås Fjukstad,
  • Shahid Akhtar,
  • Inge Johansen,
  • Ragnhild E. Aune

摘要

Sodium removal from molten aluminumAluminum is critical for maintaining product qualityQuality, yet conventional fluxing methods generate solid waste and harmful emissionsEmissions. The present study evaluates a non-reactive method that combines vacuum-assisted evaporation and electromagnetic stirringElectromagnetic stirring (EMS) to reduce sodium content without flux additives. A laboratory-scale system was designed and built to operate at 750 °C and 40 mbar. Artificial Al–Na alloys with targeted sodium levels of 50, 125, and 200 ppm were produced by alloying pure aluminumAluminum with elemental sodium, and treatment cycles of 2.5 min were applied. Sodium concentrations were determined before and after treatment using microwave plasma atomic emissionEmissions spectroscopy (MP-AESAnode Effect (AE)), with simultaneous monitoring of melt temperature, pressure, and mass. The process achieved sodium removal efficiencies exceeding 85% in several trials, with EMS promoting more uniform sodium transport within the melt. Final sodium concentrations consistently stabilized near 30 ppm, indicating an operational lower limit under the tested conditions. While the detailed mechanism requires further investigation, the results demonstrate that vacuum-assisted evaporation combined with EMS offers a promising physical alternative to conventional flux-based sodium removal from molten aluminumAluminum.