Study of the mechanism of reaction during magnesium refining from molten aluminium alloys using SiO2 particles
Keywords:Aluminium alloys, Magnesium removal, Heterogeneous chemical reactions, Aluminium scrap recycling, Mechanism of reactio
An analysis of the results regarding the permanent contact reaction that occurs between the Mg dissolved in molten aluminum and SiO2 particles is presented. The experiments were carried out at constant temperature and molten metal stirring velocity. In the Scanning Electron Microscope, the crystallographic characteristics of the reaction products were determined using the Electron Backscattered Diffraction Technique, thus allowing to establish the stoichiometry and the mechanism of reaction. The results indicate that the mechanism of reaction is governed by Al, Mg, and Si ions diffusion through the layers of reaction products composed of MgAl2O4 and Al2O3 phases. It was found that during the process the composition of the reaction products changed as the concentration of Mg in the boundary layer diminished.
 H.A.Oye, N. Mason Y R.D. Peterson, JOM 40 (1999) 29-42. doi:10.1007/s11837-999-0207-3
 L. Wang And M. Makhlouf, Int. Mater. Rev. 40 (1995) 221-238.
 C. Martínez, Tesis de Maestría, CINVESTAV, México, 1998.
 J.C. Escobedo, J.F. Hernández, S. Escobedo Y A. Flores, Rev. Metal. Madrid, 9 (2003) 171-182.
 A. Ghosh, Ritwik Sarkar, B. Mukherjee Y S.K. Das, J. Eur. Ceram. Soc. 1 (2003) 1-7.
 W.M. Zhong, G.L. Esperance Y M. Suery, Metall. Mater. Trans. A 26 (1995) 2.625-2.635.
 M. Fishkis, J. Mater. Sci. 26 (1991) 2.651- 2.661.
 B.C. Pai And S. Ray, Mater. Sci. Eng. 24 (1976) 31-45. doi:10.1016/0025-5416(76)90092-6
 M. Pfeifer, J.M. Rigsbee Y K.K. Chawla, J. Mater. Sci. 25 (1990) 1.563-1.567.
 J. Campbell, Castings, Butterwoth-Heinemann Linacre House, 2nd Ed., Jordan Hill, Oxford, UK, 2001, pp. 4-5.
 D.J. Lloyd, I. Jin Y G.C. Weatherly, Scr. Metall., 31(1994) 393–396. doi:10.1016/0956-716X(94)90006-X
 B. Hallstedt, Z.K. Liu Y J.Agren, Mater. Sci. Eng. A 129 (1990) 135–145. doi:10.1016/0921-5093(90)90352-4
 R. Molins, J.D. Bartout E Y. Bienbenu, Mater. Sci. Eng. A 135 (1991) 111-117. doi:10.1016/0921-5093(91)90546-Y
 A.D. Mcleod Y C.M.Gabryel, Metall. Trans. A. 23 (1992) 1.279-1.283.
 R.I. Sheldon, T. Hartmann, K.E. Sickafus Y A. Ibarra, J. Am. Ceram. Soc. 82 (1999) 3.293-3.391.
 O. Levenspiel, Ingeniería de las Reacciones Químicas, Editorial Reverté, 2a. Edición, Barcelona, España, 2002, pp. 406-415.
 W.M. Zhong, G.L. Esperance Y M. Suery, Mater. Charact. 49 (2003) 113-119. doi:10.1016/S1044-5803(02)00359-5
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