Abstract
The hydrogen reduction of natural magnetite concentrates is studied by thermogravimetry in the temperature range 300–570°C. An improved equation of additive retardation time contributions is used to analyze experimental data on the gas reduction rate of powder oxides. A software package is developed to calculate the time contributions of the stages of gas reduction of concentrates and their fractions. The calculated data adequately describe the experimental kinetic curves of the hydrogen reduction of magnetite powders and pellets. It is shown that the derived equations and the developed software package can be used to study the low-temperature hydrogen reduction kinetics of oxides and natural magnetites and to estimate the corresponding technological schemes without using experimental investigations. Calculated curves are presented for the hydrogen reduction of nanosize magnetites.
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References
C. Jia, L. Sun, Z. Yan, Y. Pang, L. You, and C. Yan, “Iron Oxide Tube-in-Tube Nanostructures,” J. Phys. Chem. C 111, 13022–13027 (2007).
B. K. Pradhan, T. Toba, T. Kyotani, and A. Tomita, “Inclusion of Crystalline Iron Oxide Nanoparticles in Uniform Carbon Nanotubes Prepared by a Template Carbonization Method,” Chem. Mater., No. 10, 2510–2615 (1998).
S. T. Rostovtsev, “Physical and Mathematical Modeling of Reduction Processes,” in Intensification of Reduction Processes (Nauka, Moscow, 1980), pp. 6–26.
H. Y. Sohn, “The Law of Additive Reaction Times in Fluid-Solid Reactions,” Met. Trans. 9(3), 89–96 (1978).
O. A. Teplov, “Kinetics of the Low-Temperature Hydrogen Reduction of Single-Crystal Magnetite,” Russian Metallurgy (Metally), No. 6, 498–509 (2010).
A. F. Bogdandi and G. O. Engel’, Reduction of Iron Ores (Metallurgiya, Moscow, 1971).
E. N. Eremin, Foundations of Chemical Kinetics (Vysshaya Shkola, Moscow, 1976).
M. M. Al-Kahtany and Y. K. Rao, “Reduction of Magnetite with Hydrogen. Pt. 1: Intrinsic kinetics,” Ironmaking Steelmaking 7, 49–58 (1980).
T. Ya. Malysheva and O. A. Dolitskaya, Petrography and Mineralogy of Iron-Ore Raw Materials (MISiS, Moscow, 2004).
S. Taneda, “Visualization of Separating Stokes Flows,” J. Phys. Soc. Jap. 46(6), 1935–1942 (1979).
E. N. Fuller, P. D. Schettler, and J. C. Giddings, “A New Method for Prediction of Binary Gas Phase Diffusion Coefficients,” Ind. Eng. Chem. 58(5), 18–27 (1966).
B. Delmon, Introduction a la Cinétuque Hétérogéné (Technip, Paris, 1969).
Y. K. Rao and M. Moinpour, “Kinetics of Reduction of Hematite with Hydrogen Gas at Modest Temperatures,” Met. Trans. B 14(4), 711–723 (1983).
T. Ya. Malysheva, Iron-Ore Raw Materials: Hardening during Heat Treatment (Nauka, Moscow, 1988).
O. Kubaschewski, The Thermodynamic Properties of Double Oxides (NFL, Teddington, 1970).
V. P. Barzakovskii, V. V. Lapin, N. N. Kurtseva, and A. I. Boikova, Phase Diagrams of Silicate Systems: A Handbook (Nauka, Leningrad, 1974).
C. Oprea and V. Ionescu, “TEM and XRD Investigation of Fe2O3-Al2O3 System,” Ovid. Univer. Ann. Chemistry 20(2), 222–226 (2009).
Ya. B. Zel’dovich, “On the Theory of a Reaction on a Porous or Powder Material,” Zh. Fiz. Khim., No. 2, 163–172 (1939).
A. Pineau, N. Kanari, and I. Gaballah, “Kinetics of Reduction of Iron Oxides by H2. Pt. II: Low Temperature Reduction of Magnetite,” Thermochim. Acta 456, 75–88 (2007).
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Original Russian Text © O.A. Teplov, 2012, published in Metally, 2012, No. 1, pp. 14–30.
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Teplov, O.A. Kinetics of the low-temperature hydrogen reduction of magnetite concentrates. Russ. Metall. 2012, 8–21 (2012). https://doi.org/10.1134/S0036029512010132
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DOI: https://doi.org/10.1134/S0036029512010132