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.