Effect of Heating Temperature and Mixing Rate in Mixing Ladle on Recycling of Aluminum Slag From Melting Furnace

Document Type : Original Research Article

Author

Assistant Professor, Department of Materials Engineering Saveh Branch, Islamic Azad University,Saveh, Iran.‎

10.22034/frj.2020.226706.1117

Abstract

In this research, aluminum slag produced from melting aluminum alloy AA 8011 in melting and ‎holding reverberatory furnace was collected. After the crushing and sorting, and passing the slags ‎from sieves, the slag was heated in gas fired silicon carbide crucible furnace to 750°C, 800°C, ‎‎850°C and 900°C respectively and mixed with one percent coverall flux No. 11,, and then poured in ‎mixing ladle with a 3 Cm hole in bottom of ladle this hole was placed to extract of molten metal and ‎pour in preheated ingot molds. After adding 1% coverall flux No. 11, it was mixing with 100, 200, ‎‎250 and 300 RPM for 15 minutes. The provided molten aluminum, cast continuously in to the ‎preheated ingot molds. The results show maximum efficiency of aluminum recycling in 850°C and ‎‎250 RPM. There is not chemical composition changes between primary and recycled aluminum ‎ingots. Also SEM and EDS microscopy tests, shows different amount of metallic and nonmetallic ‎inclusions content or other impurities in each recycling conditions which was lower in recycled ‎ingot at 850°C and 250 RPM

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