Review on Oxide Formation and Aluminum Recovery Mechanism during Secondary Smelting

Lawrence Opeyemi Osoba, Oluwasegun Biodun Owolabi, Segun Isaac Talabi, Samson Oluropo Adeosun


The remelting, refining, and casting process of aluminum alloys often generate aluminum dross containing primarily oxides and nitrides of aluminum and entrapped metallic aluminum at the surface of the molten metal as a result of reactions within the furnace atmosphere at elevated temperatures. The handling of dross is an expensive but necessary activity during aluminum smelting. Furthermore, the amorphous Al2O3 oxide film formed on the pure molten aluminum surface due to the liquid metal randomly distributed atoms is impermeable to the diffusion of aluminum metal and oxygen. In amorphous materials, there is a low mobility of the charge carriers and an absence of preferred diffusion paths. This film can transform to crystalline Al2O3 by nucleation and grows with time and opportunity. This review discusses the mechanism of oxide formation and the aluminum metal recovery processes.

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Hong J.-P., Wang J., Chen H.-Y., Sun B.-D., Li J.-J. & Chen Ch. (2010). Process of aluminium dross recycling and life cycle assessment for Al-Si alloys and brown fused alumina. Transactions of Nonferrous Metals Society of China, 20, 2155–2161.

Das B.R., Dash B., Tripathy B.C., Bhattacharya I.N. & Das S.C. (2007). Production of η-alumina from waste aluminium dross. Minerals Engineering, 20, 252–258.

Verdier J.-F., Butruille J.-R., Leroy M. & Valax D. (2009). Process for Recycling Aluminium Alloy Scrap Coming from the Aeronautical Industry. Patent No. 20090285716, US.

Mukhopadhyay J.Y., Ramana V. & Singh U. (2005). Extraction of value added products from aluminium dross material to achieve zero waste. TMS Light Metals, 1209–1212.

Drossel G., Friedrich S., Hupattz W., Kammer C., Lehnert W., Liesenberg O., Paul M. & Schemme K. (2003). Aluminium Handbook: Forming, Casting, Surface Treatment, Recycling and Ecology, Beuth Verlag GMbH, 636-640.

Han Q. (2003). Dross formation during remelting of aluminium 5182 remelt secondary ingot (RSI). Materials Science and Engineering, 363(1–2), 9–14.

Manfredi O., Wuth W. & Bohlinger I. (1997). Characterizing the physical and chemical properties of aluminium dross. Journal of Material, 49(11), 48–51.

Blacha L., Burdzik R., Smalcerz A. & Matuła T. (2013). Effects of pressure on the kinetics of manganese evaporation from the OT4 alloy. Archives of Metallurgy and Materials, 58(1), 197–201.

Taylor M.B. & Gagnon D. (1995). The Inert Gas Cooler (IGDC). In: Light Metals, ed. J. Evans. The Minerals, Metals & Materials Society, Warrendale PA, 819.

Lazzaro G., Eltrudis M. & Pranovi F. (1994). Recycling of aluminium dross in electrolytic pots. Resources, Conservation and Recycling, 10, 153–159.

Kulik G.J. & Daley J.C. (1990). Aluminium Dross Processing in the 90‘s. In: Second International Symposium – Recycling of Metals and Engineered Materials, J.H.L. van Linden, D.L. Stewart Jr & Y. Sahai (eds.), Warrendale PA, TMS, 427.

Shinzato M.C. & Hypolito R. (2005). Solid waste from aluminium recycling process: characterization and reuse of its economically valuable constituents. Waste Management, 25(1), 37–46.

Gil A. (2005). Management of the salt cake from secondary aluminium fusion processes. Industrial & Engineering Chemistry Research, 44(23), 8852–8857.

Alfaro I. & Ballhord R. (1997). The applications of aluminium-oxide obtained from the recycling of aluminium. In: Proceedings of the Third International Conference on Recycling of Metals, ed. I. Alfaro, Barcelona, Spain, 405–419.

Sridhar S. & Sohn H.Y. (2005).The Kinetics of Metallurgical Reactions. In: Fundamentals of Metallurgy, ed. S. Seetharaman, Cambridge, England: Woodhead Publishing, 270–349.

Medved J., Mrvar P. & Voncina P. (2009). Oxidation Resistance of Cast Magnesium Alloys. Oxidation Materials, 71, 257–270.

Antrekowitsch H. (2005). Treatment of Al-dross and recovery of metal. Short Report of Department of Nonferrous Metallurgy. Montan University Leoben.

Freti S., Bornand J.D. & Buxmann K. (1982). Metallurgy of Dross Formation on Aluminium Melts. Light Metals, proceedings of the Metallurgical Society conference, Dallas, 1003-1016.

Thiele W. (1962). Oxidation of Aluminium and Aluminium Alloys. Aluminium, 38, 780–786.

Cochran C.N., Belitskus D.L. & Kinosz D.L. (1976). Oxidation of Aluminium – Magnesium Melts in Air, Oxygen, Flue gas, and Carbon Dioxide. Light Metals, 2, 203–227.

Impey S., Stephenson D.J. & Nicholls J.R. (1990). A Study of the Effect of Magnesium Additions on the Oxide Growth Morphologies on Liquid Aluminium Alloys. In: Proceedings of the International Conference on Microscopy of Oxidation, Institute of Metals, Cambridge, UK, 238–244.

Silva M.P. & Talbot D.E.J. (1988). Oxidation of Liquid Aluminium-Magnesium Alloys. In: Light Metals, ed. P.G. Campbell, TMS.

Stewart A.L., McCubbin J.G. & Sulzer J. (1977). Melting Aluminium and Aluminium Alloys. Light Metal Age, 35(12), 13–15.

Stewart L. & McCubbin J.G. (1977). Melting Aluminium and Aluminium Alloys. In: Proceedings of the first international aluminium extrusion technology, Aluminium Company of Canada Ltd, Ontario, Canada.

Wenz D.A. (1979). Laboratory Investigation of Skim Formation, Cast Shop Technology. Metallurgical Society AIME, 2, 771–780.

Kubaschewski O. & Hopkins B.E. (1953). Oxidation of metals and alloys. London: Butterworths Scientific Publications.

Wilsdorf H.G.F. (1951). Structure of Amorphous Aluminium Oxide Films. Nature, 168(4275), 600–601.

Jeurgens L.P.H., Sloof W.G., Tichelaar F.D. & Mittemeijer E.J. (2002). Structure and morphology of aluminium-oxide films formed by thermal oxidation of aluminium. Thin Solid Films, 418, 89–101.

Wilson S.J. & McConnell J.D.C. (1980). A kinetic study of the system γ-AlOOH/Al2O3. Journal of Solid State Chemistry, 34(3), 315–322.

Impey S., Stephenson D.J. & Nicholls J.R. (1988). Mechanism of Scale Growth on Liquid Aluminium. Journal of Materials Science and Technology, 4, 1126–1132.

Agema K.S. & Fray D.J. (1989). Preliminary Investigations on the Deformation Behaviour of an Oxide Scale on Molten Aluminium. Department of Material Science and Metallurgy, University of Cambridge.

Sleepy W.C. (1961). Oxidation of molten high purity aluminium in dry oxygen. Journal of Electrochemical Society, 108(12), 1097–1102.

Campbell J. (2003). Castings, 2nd ed., Oxford – Boston: Butterworth Heinemann.

Dignam M.J. (1962). Oxide Films on Aluminium Ionic conduction and structure. Journal of the Electrochemical Society, 109(3), 184–191.

Doherty P.E. & Davis R.S. (1963). Direct observation of the oxidation of aluminium single-crystal surfaces. Journal of Applied Physics, 34(3), 619–628.

Scamans G.M. & Butler E.P. (1975). In situ observations of crystalline oxide formation during aluminium and aluminium alloy oxidation. Metallurgical Transactions A, 6(11), 2055–2063.

Dignam M.J., Fawcett W.R. & Böhni H. (1996). The Kinetics and Mechanism of Oxidation of Superpurity Aluminium in Dry Oxygen I. Apparatus Description and the Growth of Amorphous Oxide. Journal of the Electrochemical Society, 113(7), 656–662.

Impey S.A. (1989). The mechanism of dross formation on aluminium and aluminium-magnesium alloys. Cranfield Institute of Technology.

Drouzy M. & Mascré C. (1969). The oxidation of liquid non-ferrous metals in air or oxygen. Metallurgical Reviews, 14, 25–46.

Galindo R., Padilla I., Rodríguez O., Sánchez-Hernández, López-Andrés S. & López-Delgado A. (2015). Characterization of Solid Wastes from Aluminium Tertiary Sector: The Current State of Spanish Industry. Journal of Minerals and Materials Characterization and Engineering, 3, 55–64.

Wang S., Hu H., Chu Y.-I. & Cheng P. (2008). Dross Recovery of Aluminium Alloy 380. In: Proceedings of the Cast Expo 2008. Atlanta, Georgia, USA, 60090, 1–7.

Hwang J.Y., Huang X. & Xu Z. (2006). Recovery of Metals from Aluminium Dross and Saltcake. Journal of Minerals & Materials Characterization & Engineering, 5(1), 47–62.

Lucheva B., Tsonev T. & Petkov R. (2005). Non-Waste Aluminium Dross Recycling. Journal of Chemical Technology and Metallurgy, 40(4), 335–338.

Yoshimura H.N., Abreu A.P., Molisani A.L., de Camargo A.C., Portela J.C.S. & Narita N.E. (2008). Evaluation of Aluminium Dross Waste as Raw Material for Refractories. Ceramics International, 34(3), 581–591.

Kevorkijan V.M. (1999). The Quality of Aluminium Dross Particles and Cost-effective Reinforcement for Structural Aluminium-based Composites. Composites Science and Technology, 59(11), 1745–1751.

Peterson R.D. (2002). Review of aluminium dross processing. In: Light Metals, ed. W. Schneider, TMS, Warrendale, PA, 1029–1037.

Martin B. & Daniel G. (1995). The Inert Gas Cooler (IGDC). In: Light Metals, ed. J. Evans, The Minerals, Metals & Materials Society, Las Vegas, 819–822.

Van Linden J.H.L. (1991). Aluminium Melt Treatment and Casting. 2nd Australian Asian Pacific Course and Conference, University of Melbourne Parkville, Victoria, Australia, 121–129.

Rezac K.H. (1991). Aluminium Melt Treatment and Casting. 2nd Australian Asian Pacific Course and Conference, University of Melbourne, Parkville, Victoria, Australia, 111–117.

Nijhof G.H., van Olst K. & Schokker E.A. (2000). New techniques for separation of non-ferrous metals from waste streams. In: The Minerals, Metals and Materials Society, Warrendale, PA, 865–870.

Soto H. & Toguri J.M. (1986). Aluminum recovery from dross by flotation. Conservation Recycling, 9(1), 45–54.

Bruckard W.J. & Woodcock J.T. (2004). Characterization of metal-containing waste products in relation to retreatment methods for metal recovery and recycling. In: Green Processing 2004. 2nd International Conference on the Sustainable Processing of Minerals, The Australasian Institute of Mining and Metallurgy, Melbourne, 217–224.

Groteke D.E. (1998). An aluminium reclaimer for small foundry applications. The Journal of Minerals, Metals and Materials Society, 50(5), 46–47.

Groteke E. (2000). Reducing melt losses in die casting operations. Die Casting Engineer, 44(4), 40.

Groteke E. (2000). Dross Reclamation at aluminium melting furnace sites. In: Fourth (4th) International Symposium on Recycling of Metals and Engineered Materials: roceedings of a symposium organized by the Recycling Committee of the Extraction & Processing Division and the Light Metals Division of TMS, eds. D.L. Stewart Jr, J.C. Daley & R.L. Stephens, October 22-25, Pittsburgh, Pennsylvania, 1123–1134.

Groteke E. (2000). Dross Reclamation at aluminium melting furnaces. In: Transactions of the American Foundry Society and the proceedings of the one hundred fourth annual meeting, Pittsburgh PA, 108, 579–584.

Ünlü N. & Drouet M.G. (2002). Comparison of salt-free aluminium dross treatment processes. Resources Conservation and Recycling, 36(1), 61–72.

Drouet M.G. (1994). Dross treatment in a rotary arc furnace with graphite electrode. Journal of Metals, 5, 26–27.

Ridderbusch M., Jaroni B., Arnold A. & Friedrich B. (2009). From oxide residues of Al-slag treatment to SiAl-masteralloys via carbothermic reduction. 5th European Metallurgical Conference (EMC), Innsbruck, Austria, 173–188.

Mukhopadhyay J.Y., Ramana V.U. & Singh U. (2005). Extraction of value added products from aluminium dross material to achieve zero waste. In: Light Metals, ed. A.T. Tabereaux, TMS The Minerals, Metals and Materials Society, Warrendale PA, 1209–1212.

Amer A.M. (2002). Extracting aluminium from dross tailings. Journal of Metals, 54, 72–75.

Huckabay D.A. & Skiathas A.D. (1981). Aluminium dross processing. Patent No. WO2014207072A1, US.

Durward A. & Arthur D.S. (1982). Aluminium sulfate manufacture from aluminium dross tailings. Patent No. 4320098A, US.

Dash B., Das B.R., Tripathy B.C., Bhattacharya I.N. & Das S.C. (2008). Acid dissolution of alumina from waste aluminium dross. Hydrometallurgy, 92, 48–53.

Miskufova A., Petranikova M., Kovacs M., Havlik T., Orac D. & Briancin J. (2009). Leaching of aluminium dross in alkaline solution. Emc 2009: European Metallurgical Conference, Innsbruck, Austria, Global Growth of Nonferrous Metals Production: Proceedings, GDMB, Clausthal-Zellerfeld, 1339–1350.

Tsakiridis P.E., Oustadakis P. & Agatzini-Leonardou S. (2003). Aluminium recovery during black dross hydrothermal treatment. Journal of Environmental Chemical Engineering, 1(1–2), 23–32.

Schwarz H.G. (2004). Aluminium Production and Energy. In: Encyclopedia of Energy, ed. C.J. Cleveland, Elsevier, 81–95.

Chemicals Decree 675/1993; amendments up to 555/2001 included, Section 3.

European Waste Catalogue and Hazardous Waste List (2002). Environmental Protection Agency, Ireland.

Xiao Y., Reuter M.A. & Boin U. (2005). Aluminium recycling and environmental issues of salt slag treatment. Journal of Environmental Science and Health, Part A: Toxic/Hazardous Substances and Environmental Engineering, 40, 1861–1875.

Calder G.V. & Stark T.D. (2010). Aluminium reactions and problems in municipal solid waste landfills. Practice Periodical of Hazardous Toxic and Radioactive Waste Management, 14, 258–265.

Lorber K.E. & Antrekowitsch H. (2010). Treatment and disposal of residues from aluminium dross recovery. 2nd International Conference on Hazardous and Industrial Waste Management, Crete.

Lorber K.E. (2002). Disposal of dross on landfill: A case study. In: Proceedings of International Solid Waste Association (ISWA), World Environment Congress, Istanbul, Turkey.

Tsakiridis P.E. (2012). Aluminium salt slag characterization and utilization – A Review. Journal of Hazardous Materials, 217–218, 1–10.

El-Katatny E.A. (2000). Recovery of high surface area alumina from aluminium dross tailings. Journal of Chemical Technology & Biotechnology, 75, 394–402.

Zhang L. (2006). State of the art in aluminium recycling from aluminium dross. Light Metals: Proceedings of Sessions, TMS Annual Meeting, San Antonio, TX, 931–936.



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