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Recycling of aluminum alloy scrap obtained from delaminated fibre metal laminates(FMLs) was studied through high temperature refining in the presence of a salt flux.The aluminum alloy scrap contains approximately mass fraction w(Cu) = 4.4%,w(Mg) = 1.1% and w(Mn) = 0.6%(2024 aluminum alloy).The main objective of this research is to obtain a high metal yield,while maintaining its original alloy compositions.The work focuses on the metal yield and quality of recycled Al alloy under different refining conditions.The NaCl-KCl salt system was selected as the major components of flux in the Al alloy recycling.Two different flux compositions were employed at NaCl to KCl mass ratios of 44:56 and 70:30 respectively,based on either the eutectic composition,or the European preference.Different additives were introduced into the NaCl-KCl system to study the effect of flux component on recycling result.Although burning and oxidation loss of the alloying elements during re-melting and refining take place as the drawbacks of conventional refining process,the problems can be solved to a large extent by using an appropriate salt flux.Experimental results indicate that Mg in the alloy gets lost when adding cryolite in the NaCl-KCl salt system,though the metal yield can reach as high as 98%.However,by adding w(MgF 2) = 5% into the NaCl-KCl salt system(instead of using cryolite) all alloying elements were well controlled to its original composition with a metal yield of almost 98%.
Recycling of aluminum alloy scrap obtained from delaminated fiber metal laminates (FMLs) was studied through high temperature refining in the presence of a salt flux. The aluminum alloy scrap containing approximately mass fraction w (Cu) = 4.4%, w (Mg) = 1.1 % and w (Mn) = 0.6% (2024 aluminum alloy). The main objective of this research is to obtain a high metal yield, while maintaining its original alloy compositions. The work focuses on the metal yield and quality of recycled Al alloy under different refining conditions. The NaCl-KCl salt system was selected as the major components of flux in the Al alloy recycling. Two different flux compositions were employed at NaCl to KCI mass ratios of 44:56 and 70:30 respectively, based on either the eutectic composition, or the European preference. Different additives were introduced into the NaCl-KCl system to study the effect of flux component on recycling result. Although burning and oxidation loss of the alloying elements during re-melting and refining take p lace as the drawbacks of conventional refining process, the problems can be solved to a large extent by using an appropriate salt flux. Experimental results indicate that Mg in the alloy gets lost when adding cryolite in the NaCl-KCl salt system, though the metal yield by the addition of w (MgF2) = 5% into the NaCl-KCl salt system (instead of using cryolite) all alloying elements were well controlled to its original composition with a metal yield of almost 98 %.