Abstract
The oxidation of ilmenite (FeTiO3) in air and dry oxygen was investigated over the temperature interval 600 to 970°C. Dense platelets of ilmenite crystals as well as powder samples of ilmenite were oxidized. The weight data were recorded employing a thermobalance. The oxidation kinetics of ilmenite platelets were parabolic except for the initial stages during which logarithmic kinetics were observed. For powder samples the logarithmic rate law was followed primarily. The logarithmic rate law was attributed to free penetration of oxygen through cracks and short-circuit paths. The activation energies associated with the logarithmic rate law were nearly one-half of those obtained from parabolic oxidation. The growth morphology of the products of oxidation of ilmenite was observed with a scanning electron microscope. The effect of growth morphology on the kinetics is discussed, and a probable reaction mechanism is suggested for the oxidation of ilmenite.
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References
G. Teufer and A. K. Temple,Nature 211, 179 (1966).
A. K. Temple,Econ. Geol. 61, 695 (1966).
R. Guimond,Titanium and QIT., Mining in Canada 11 (Nov. 1964).
W. Volk and H. H. Stotler,Hydrogen Reduction of Ilmenite Ores in a Fluid Bed, paper presented at the Canadian Institute of Metallurgists (CIM) Conference, Windsor, Canada, August 25–27, 1969.
V. B. Fetisov, L. I. Leont'yev, B. Z. Kudinov, and S. V. Ivanova,Izv. Akad. Nauk SSSR, Metal 2, 47 (1968) (Russ.);Russian Metallurgy (Metally) 2, 35 (i968) (Engl. transl.).
D. Bhogeswara Rao and M. Rigaud,High Temp. Sci. (in press).
O. Kubaschewski and B. E. Hopkins,Oxidation of Metals and Alloys (Academic Press, Inc., New York, 1953).
P. Kofstad,High Temperature Oxidation of Metals (John Wiley & Sons, Inc., New York, 1966).
S. F. Hulbert,J. British Ceram. Soc. 6, 11 (1969).
F. Habashi,Principles of Extractive Metallurgy (Gordon and Breach Science Publishers, New York, 1969), Vol. 1.
C. Wagner,Atom Movements (Am. Soc. Metals, Cleveland, Ohio, 1951).
D. E. Davies, U. R. Evans, and J. N. Agar,Proc. Roy. Soc. (London) A225, 443 (1954).
W. H. Vernon, E. I. Akeroyd, and E. G. Stroud,J. Inst. Metals 65, 301 (1939).
F. A. Champion and M. Whyte,J. Inst. Metals 75, 737 (1949).
J. P. Roberts and C. Wheeler,Trans. Faraday Soc. 56, 570 (1960).
S. M. Klotsman, A. N. Timofeyev, and I. Sh. Trakktenberg,Fiz. Metal. Metalloved. 16, 86 (1963) (Russ.);Phys. Metals Metallog. (USSR)16, 86 (1963) (Engl. transl.).
W. Jander,Z. Anorg. Allgem. Chem. 163, 1 (1927).
G. Velensi,Compt. Rend. 202, 309 (1936).
R. E. Carter,J. Chem. Phys. 35, 1137 (1962).
E. A. Geiss,J. Am. Ceram. Soc. 46, 374 (1963).
E. A. Gulbransen and K. F. Andrew,J. Metals 1, 515 (1949).
W. A. Alexander and L. M. Pidgeon,Can. J. Res. B28, 60 (1950).
D. Bhogeswara Rao and J. R. Wynnyckyj,High Temp. Sci. (to be submitted).
H. F. Fischmeister, inReactivity of Solids, J. H. De Boeret al, Eds. (Eisevier, Amsterdam, 1960), p. 195.
E. A. Gulbransen and T. P. Copan,Nature 186, 959 (1960).
E. A. Gulbransen and T. P. Copan,Proc. European Conf. Electron Microscopy, Delft 1, 225 (1961).
F. C. Frank,Ada Cryst. 4, 497 (1951).
J. Markali,Research 10, 367 (1957).
K. Hauffe,Oxidation von Metallen und Metallegierungen (Springer, Berlin, 1956).
L. B. Pfeil,J. Iron Steel Inst. 119, 501 (1929).
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Bhogeswara Rao, D., Rigaud, M. Kinetics of the oxidation of ilmenite. Oxid Met 9, 99–116 (1975). https://doi.org/10.1007/BF00613496
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DOI: https://doi.org/10.1007/BF00613496