Abstract
The rate of formation of SiO(g) by the reaction of CO and H2 with silica or silicate slags containing SiO2, CaO, and A12O3 has been measured. The rate with hydrogen for both pure silica and silica in slags is controlled by gas phase mass transport. The rate changed with flow conditions, sample size, and gas properties as predicted by the appropriate mass transfer equations. In particular, the rate is faster in H2-He than in H2-Ar gas mixtures with the same hydrogen pressure, which proves conclusively the rate is controlled by gas phase mass transport. The rate of formation of SiO by the reaction of silica with CO did not change with flow conditions or particle size and the rate was the same in CO-He and CO-Ar with the same pressure of CO. In addition, the calculated rate with CO for mass transfer is considerably faster than was observed. These observations strongly indicate the rate is controlled by chemical kinetics on the surface. Similar results were obtained for the rate of reaction of CO with silica in slags and the rate was found to be proportional to the activity of SiO2 and CO pressure. The present results are discussed in relationship to silicon transfer in slag-metal reactions.
Similar content being viewed by others
Reeerences
B. Ozturk and R.J. Fruehan:Metall. Trans, B, 1985, vol. 16B, pp. 121–28.
R.J. Pomfret and P. Grievson:Can. Met. Quart., 1983, vol. 22, p. 287.
E.T. Turkdogan, G.J. W. Kor, and R.J. Fruehan:Ironmaking and Steelmaking, 1980, vol. 7, p. 268.
K. Schwerdtfeger:Trans. Metall. Soc. AIME, 1966, vol. 236, pp. 1152–56.
Y. Mizusaki, K. Hagiwara, C. Yamataga, and E. Kato:Tetsu to Hagané, 1975, vol. 61, p. 10S.
W.E. Ranz and W. R. Marshall, Jr.:Chem. Eng. Progr., 1952, vol. 48, pp. 141–46.
R.J. Fruehan and L.J. Martonik:Metall. Trans., 1973, vol. 4, p. 2789.
R. C. Reid, J. M. Pravsnitz, and T. K. Sherwood:The Properties of Gases and Liquids, 3rd ed., McGraw-Hill, New York, NY, 1977.
R.B. Bird, W.E. Steward, and E. N. Lightfoot:Transport Phenomena, John Wiley and Sons, New York, NY, 1960, pp. 569–71.
A. Muan and E. F. Osborn:Phase Equilibria Among Oxides in Steelmaking, Addison-Wesley, Reading, MA, 1965, p. 95.
R.H. Rein and J. Chipman:Trans. Metal. Soc. AIME, 1965, vol. 233, pp. 415–25.
D.R. Stull and H. Prophet:JANAF Thermochemical Tables, NS RDS-NBS37, U.S. Dept. Commerce, Washington, DC, 1971.
H.F. Ramstad, R. D. Richardson, and P. J. Bowles:Trans. Metall., Soc. AIME, 1961, vol. 221, pp. 1021–28.
G. Grube and H. Spiedel: Z.Electrochem., 1949, vol. 53, pp. 341–43.
E.T. Turkdogan:Physical Chemistry of High Temperature Technology, Academic Press, New York, NY, 1980, pp. 5–24.
Y. Sasaki, S. Hara, D. R. Gaskell, and G. R. Belton:Metall. Trans. B, 1984, vol. 15B, p. 563.
K. Ishii, S. Kishimoto, and C. Yoshii:Proc. Int. Conf. Sci. Tech. Iron Steel, Tokyo, Japan, 1970, p. 506.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Ozturk, B., Fruehan, R.J. The rate of formation of SiO by the reaction of CO or H2 with silica and silicate slags. Metall Trans B 16, 801–806 (1985). https://doi.org/10.1007/BF02667516
Received:
Issue Date:
DOI: https://doi.org/10.1007/BF02667516