Open Access Peer-reviewed

Kinetics of Recovery of Alumina from Aluminium Casting Waste through Fusion with Sodium Hydroxide

U K Sultana1, Fahmida Gulshan1, M A Gafur2, A S W Kurny1,

1Department of Materials and Metallurgical Engineering, Bangladesh University of Engineering and Technology, Dhaka, Bangladesh

2Bangladesh Council for Scientific and Industrial Research, Dhaka, Bangladesh

American Journal of Materials Engineering and Technology. 2013, 1(3), 30-34. DOI: 10.12691/materials-1-3-1
Published online: August 25, 2017

Abstract

Aluminium dross containing 72% Al2O3 and 14.0% SiO2 was fused with NaOH for a period of up to 60 minutes in the temperature range of 500 – 750°C in a stainless steel crucible. The fused mass was dissolved in water. Amount of alumina in the solution was determined by EDTA compleximetric (masking and demasking) chemical method. The optimum condition for alumina extraction was determined as NaOH to aluminium dross weight ratio = 3.5, temperature = 750°C and time 60 minutes. Avrami-Erofeev equation [-ln (1-α) = (k3t) m, m = 3/2] seemed to be most appropriate one to fit the kinetic data of fusion of aluminium dross with NaOH. The activation energy was found to be 6.452kJ/mol.

Keywords:

alumina recovery, aluminum foundry waste, sodium hydroxide, fusion, reaction mechanism, kinetics, activation energy
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