Synthesis of Hercynite from Aluminium Dross at 1550°C: Implication for Industrial Waste Recycling

Abstract:

Aluminium dross is a waste from aluminium melting process, containing approximately 70 wt% of Al₂O₃. Disposal of dross in landfill causes soil and ground water pollutions, leading to the difficulty of waste management. This work aims to utilize aluminium dross as a source of Al₂O₃ for the synthesis of hercynite (FeAl₂O₄). Aluminium dross was heated at 1200°C for 1 hour in air and then compacted into a substrate using a hydraulic press. The substrate was brought into contact with two different types of iron chip at 1550°C in air for 6 hours. Pure iron chip and iron chips containing 0.8 wt% carbon were employed in this experiment in order to investigate the effect of carbon content in the iron chip on the formation of hercynite. The samples after reactions were characterized using XRD, SEM and EDS techniques. It was found that the final product is hercynite having a dark grey solid phase. The formation of hercynite was due to the interaction of Al₂O₃ in the dross with Fe and/or FeO in the system. FeO came from the oxidization of iron chip due to the excess of oxygen in the system. Carbon content in the iron was found to effect the formation of FeO in the system, which in turn effect the formation of hercynite. This research is one of the possible way to recycling aluminium dross instead of bury in a landfill.

• Periodical: Materials Science Forum (Volume 977)
• Pages: 223-228
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.977.223
• Online since: February 2020
• Authors: Chirakit Chobtham, Somyote Kongkarat*
• Keywords: Aluminium Dross, Hercynite, Recycling, Waste

References

[1] M. Satish Reddy and D. Neeraja, Aluminium residue waste for possible utilisation as a meterial: a review, Indian Academy of Science. Sadhana (2015) 43:124.

[2] B.R. Das, B. Dash, B.C. Tripathy, I.N. Bhattacharya and S.C. Das, Production of ŋ-alumina from waste aluminium dross, Minerals Engineering. 20 (2006) 252-258.

DOI: 10.1016/j.mineng.2006.09.002

[3] M.A.A. Daghetta, M. Dapiaggi, L. Pellegrino, B. Pastore, L. Pagliari and C.V. Mazzocchia, Synthesis of hercynite at very mild condition, Chemical Engineering Transactions. 43 (2015) 1741.

[4] J. Chen, J. Su, M. Yan and S. Yang, Two methods of synthesizing hercynite, Applied Mechanics and Materials. 543-547 (2014) 3380-3383.

DOI: 10.4028/www.scientific.net/amm.543-547.3830

[5] J. Chen, L. Yu, J. Sun, Y. Li and W. Xue, Synthesis of hercynite by reaction sintering, The European Ceramic Society. 31 (2011) 259-263.

DOI: 10.1016/j.jeurceramsoc.2010.09.017

[6] J. Chen, M. Yan, J. Su, B. Li, W. Mi and J. Sun, Thermogravimetric analysis of hercynite synthesized by reaction sintering, International Power Electronics and Materials Engineering Conference. (2015).

DOI: 10.2991/ipemec-15.2015.224

[7] S. Otroj, Synthesis of hercynite under air atmosphere using MgAl2O4 spinel, Materials Science (Medziagotyra). 21 (2015) 1392-1320.

DOI: 10.5755/j01.ms.21.2.5866

[8] D.P. Dutta and G. Sharma, Synthesis and magnetic behavior of spinel FeAl2O4 nanoparticles, Materials Science and Engineering B. 176 (2011) 177-180.

DOI: 10.1016/j.mseb.2010.10.018

[9] F. Nestola, B. Periotto, C. Anzolini, G.B. Andreozzi, A.B. Woodland, D. Lenaz, M. Alvaro and F. Princivalle, Equation of state of hercynite, FeAl2O4, and high pressure systematics of Mg-Fe-Cr-Al Spinels, Mineralogical Magazine. 79 (2015) 285-294.

DOI: 10.1180/minmag.2015.079.2.07

[10] I. Jastrzebska, J. Szczerba, A. Blachowski and P. Stoch, Structure and microstructure evolution of hercynite spinel (Fe2+Al2O4) after annealing treatment, Eur. J. Mineral. 29 (2017) 63-72.

DOI: 10.1127/ejm/2017/0029-2579