eng Science and Education Publishing American Journal of Materials Engineering and Technology 2013-05-30 1 1 30 34 10.12691/materials-1-3-1 MATERIALS2013131 article U K Sultana 1 Fahmida Gulshan 1 M A Gafur 2 A S W Kurny aswkurny@mme.buet.ac.bd 2 Department of Materials and Metallurgical Engineering, Bangladesh University of Engineering and Technology, Dhaka, Bangladesh Bangladesh Council for Scientific and Industrial Research, Dhaka, Bangladesh 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 ¨C 750¡ãC 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¡ãC and time 60 minutes. Avrami-Erofeev equation [-ln (1-¦Á) = (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. http://pubs.sciepub.com/materials/1/3/1/materials-1-3-1.pdf alumina recovery aluminum foundry waste sodium hydroxide fusion reaction mechanism kinetics activation energy