Science and Education Publishing American Journal of Materials Engineering and Technology 1 3 2013 11 18 Kinetics of Recovery of Alumina from Coal Fly Ash through Fusion with Sodium Hydroxide 54 58 EN M A Rahaman M A Gafur A S W Kurny Department of Materials and Metallurgical Engineering, Bangladesh University of Engineering and Technology, Dhaka, Bangladesh MATERIALS2013136 10.12691/materials-1-3-6 2013 08 11 2013 11 03 2013 11 18 Coal fly ash containing 35.9 % Al2O3 and 53.0%SiO2 was fused with NaOH for a period of up to 60 minutes in the temperaure range of 300°C-800°C in a stainless steel crucible. The fused mass was dissolved in water. Amount of alumina in the solution was determined by by EDTA compleximetric (masking and demasking) chemical method. The optimum condition for alumina extraction was determined as NaOH to CFA weight ratio = 3.5, temperature = 700°C and time = 30 minutes. Avrami-Erofeev equation i.e. -ln(1-) = (k3t) m (when m=1) seemed to be the most appropriate one to fit the kinetic data of fusion of coal fly ash with NaOH. The activation energy was found to be 13.94 kJ/mol.