Influence of Salt Quantity on Recovery Yield of Heterogeneous Aluminium Scrap

Abstract:

The influence of the salt quantity on the recovery yield of aluminium scrap was studied considering an heterogeneous charge. The analysed heterogeneous charge was composed by different types of scrap such as turning, shredded materials and dross. The amount of salt was related to the scrap quality using the salt factor, which is defined as the ratio between the non-aluminium content in the scrap and the quantity of salt required. Two levels of salt factor were considered, 1.2 and 1.8. The analysis of variance was then implemented to verify the influence of the salt quantity on the recovery yield. The results were statistically confirmed using the Anderson-Darling test, the Dixon’s outliers test and the coefficient of variance. An increment of the recovery yield from 95% to 97% was revealed by increasing the salt factor from 1.2 to 1.8.

• Periodical: Advanced Materials Research (Volume 1139)
• Pages: 16-19
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.1139.16
• Online since: July 2016
• Authors: Stefano Capuzzi*, Giulio Timelli, Leonardo Capra, Luca Romano
• Keywords: Aluminium Recycling, ANOVA, Heterogeneous Scrap, Salt Factor

References

[1] J. Blomberg, P. Söderholm, The economics of secondary aluminium supply: An econometric analysis based on European data, Resour. Conserv. Recy. 53 (2009) 455-463.

DOI: 10.1016/j.resconrec.2009.03.001

[2] E. Sevigné-Itoiza, C.M. Gasola, J. Rieradevalla, X. Gabarrella, Environmental consequences of recycling aluminum old scrap in a global market, Resources, Conservation and Recycling 89 (2014) 94-103.

DOI: 10.1016/j.resconrec.2014.05.002

[3] T.A. Utigard, K. Friesen, R.R. Roy, J. Lim, A. Silny, C. Dupuis, The Properties and Uses of Fluxes in Molten Aluminum Processing, JOM (1998 November) 38-43.

DOI: 10.1007/s11837-998-0285-7

[4] J.A.S. Tenorio, D.C.R. Espinosa, Effect of salt/oxide interaction on the process of aluminum recycling, Journal of Light Metals 2 (2002) 89-93.

DOI: 10.1016/s1471-5317(02)00027-5

[5] J.A.S. Tenorio, D.C.R. Espinosa, M.C. Carboni, Recycling of aluminum-effect of fluoride additions on the salt viscosity and on the alumina dissolution, Journal of Light Metals 1 (2001) 195-198.

DOI: 10.1016/s1471-5317(01)00013-x

[6] B. Friedrich, M. Gerke, J. Kruger, A. Arnold, Improved aluminium recovery at recycling plants by integrated slag refining, European Metallurgical Conference, Dusseldorf, (2011).

[7] U.M.J. Boin, M. Bertram, Melting Standardized Aluminum Scrap: A Mass Balance Model for Europe, JOM (2005 August) 26-33.

DOI: 10.1007/s11837-005-0164-4

[8] CEN, (2003).