Chemical Interactions of Dross with Water and Water Vapor in Aluminum Scrap Remelting

  • Narayanan Ramesh
    Department of Materials Science and Engineering, The Ohio State University
  • Sahai Yogeshwar
    Department of Materials Science and Engineering, The Ohio State University

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  • Chemical Interactions of Dross with Wat

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Remelting of Aluminum alloys such as Used Beverage Container (UBC) is done under a cover of molten salt flux based on NaCl–KCl. After the remelting process is over, the used flux (called dross) reacts with water vapor to produce gaseous emissions. Dross is also leached by dissolving in water and subsequently crystallized to regenerate the salt flux for reuse. This leaching process also generates emissions. The calculations indicate that the trace components, such as AlN and Al4C3 present in the dross react with water (or water vapor) to produce NH3 (g) and CH4 (g) in quantities greater than HCl (g) or HF (g) generated from reactions of NaCl, KCl, and NaF with water or water vapor.

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