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Recycling of Aluminum from Fibre Metal Laminates

Journal of Shanghai Jiaotong university(Science) 2012年第3期17卷 263-267页

作者：祝国梁肖艳萍杨永祥王俊孙宝德 BOOM Rob Department of Materials Science and Engineering Delft University of Technology2628 CD DelftThe Netherlands State Key Laboratory of Metal Matrix Composites Shanghai Jiaotong University Department of Metallurgical Engineering Anhui University of Technology Institute of Ferrous Metallurgy Northeastern University

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 a1 alloy under different refining conditions. The NaCI-KC1 salt system was selected as the major components of flux in the a1 alloy recycling. Two different flux compositions were employed at NaC1 to KC1 mass ratios of 44：56 and 70：30 respectively, based on either the euteetic composition, or the European preference. Different additives were introduced into the NaCI-KC1 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 NaCI-KC1 salt system, though the metal yield can reach as high as 98%. However, by adding w（MgF2） = 5% into the NaCI-KC1 salt system （instead of using cryolite） all alloying elements were well controlled to its original composition with a metal yield of almost 98%.

关键词： Al-Cu-Mg alloy 2024 a1 recycling cryolite salt flux

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