Abstract
Measurements of the rate of dissociation of CO2 have been made by the14CO2-CO isotope exchange technique on calcium ferrite melts with Ca/Fe = 0.30 at 1300 °C. Studies have also been made of the interfacial rates of oxidation of calcium ferrite melts with an average CaO content of 19.45 wt pct (CaJFe ≃0.33) in CO2-CO atmospheres at 1362 °C. It is shown that the rates of oxidation are consistent with the rates of isotope exchange, indicating a common rate determining step. Measurements of the equilibrium Fe3+/Fe2+ ratio as a function of the CO2/CO ratio for 19.3 wt pct CaO melts at 1360 °C and for 28.7 and 18.6 wt pct CaO melts at 1300 °C are found to be in close agreement with the deductions of Takeda, Nakazawa, and Yazawa. Combination of the equilibrium data with the results of the isotope exchange studies indicate that the apparent first order rate constant for the dissociation of CO2 is inversely proportional to the square of the Fe3+JFe2+ ratio of the melt, as has been previously found for liquid iron oxide, lime-saturated calcium ferrites, silicasaturated iron silicates, and an equimolar “FeO”-CaO-SiO2 melt.
Article PDF
Similar content being viewed by others
Explore related subjects
Discover the latest articles, news and stories from top researchers in related subjects.Avoid common mistakes on your manuscript.
References
Y. Sasaki, S. Hara, D. R. Gaskell, and G. R. Beiton:Metall. Trans. B, 1984, vol. 15B, pp. 563–71.
S.K. El-Rahaiby, Y. Sasaki, D.R. Gaskell, and G. R. Belton:Metall. Trans. B, 1986, vol. 17B, pp. 307–16.
L. S. Darken and R.W. Gurry:J. Am. Chem. Soc, 1946, vol. 68, pp. 798–816.
H. Larson and J. Chipman:Trans. AIME, 1953, vol. 197, pp. 1089–96.
Y. Takeda, S. Nakazawa, and A. Yazawa:Can. Met. Quart., 1980, vol. 19, pp. 297–305.
E. J. Michal and R. Schuhmann, Jr:Trans. AIME, 1952, vol. 194, pp. 723–29.
M. Timucin and A. E. Morris:Metall. Trans., 1970, vol. 1, pp. 2193–201.
S. Ban-ya, A. Chiba, and A. Hikosaka:Tetsu-to-Hagané, 1980, vol. 66, pp. 1484–93.
S. Hara, T. Araki, and K. Ogino:Proc. Int. Symp. on Metallurgical Slags and Fluxes, H. A. Fine and D. R. Gaskell, eds., TMS-AIME, Warrendale, PA, 1984, pp. 441–51.
S. Ban-ya, Y. Iguchi, and T. Nagasaka:Tetsu-to-Hagané, 1983, vol. 69, p. S761 and 1984, vol. 70, pp. A21-24; also, T. Nagasaka, Y. Igushi, and S. Ban-ya: Proc. 5th Int. Iron and Steel Congress, vol. 3, pp. 669–78, Iron and Steel Soc, AIME, Warrendale, PA, 1986.
F. Tsukihashi, K. Kato, K. Otsuka, and T. Soma:Trans. Iron and Steel Inst. Jpn., 1982, vol. 22, pp. 688–95.
H.A. Fine, D. Meyer, D. Janke, and H-J. Engel:Ironmaking Steel-making, 1985, vol. 12, pp. 157–62.
G. R. Belton:Proc. Int. Symp. on Metallurgical Slags and Fluxes, H.A. Fine and D.R. Gaskell, eds., TMS-AIME, Warrendale, PA, 1984, pp. 63–85.
A. M. Strachan and P. Grieveson:Metal-Slag-Gas Reactions and Processes, Z.A. Foroulis and W. W. Smeltzer, eds., The Electro-chemical Society, Princeton, NJ, 1975, pp. 38–49.
A.W. Cramb, W. R. Graham, and G. R. Belton:Metall. Trans. B, 1978, vol. 9B, pp. 623–29.
H. W. Melville and B. G. Gowenlock:Experimental Methods in Gas Reactions, MacMillan and Co., London, 1964.
F.D. Richardson:Physical Chemistry of Melts in Metallurgy, Aca-demic Press Inc., London, 1974, vol. 2, p. 331.
J.A. Imlach and F. P. Glasser:Trans. Brit. Ceram. Soc, 1973, vol. 72, pp. 221–28.
M.T. Simmnad, G. Derge, and I. George:Trans. AIME, 1954, vol. 200, pp. 1386–90.
W. R. Dickson and E. B. Dismukes:Trans. TMS-AIME, 1962, vol. 224, pp. 505–11.
E.A. Dancy and G. Derge:Trans. TMS-AIME, 1966, vol. 236, pp. 1642–48.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Sun, S., Sasaki, Y. & Belton, G.R. On the interfacial rate of reaction of CO2 with a calcium ferrite melt. Metall Trans B 19, 959–965 (1988). https://doi.org/10.1007/BF02651419
Received:
Issue Date:
DOI: https://doi.org/10.1007/BF02651419