酸素吹精による溶鉄の脱炭速度について : 製鋼反応の速度論的研究 II

概要

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The rate of carbon oxidation is measured by blowing the oxygen gas into liquid iron. The reaction can be written such as C__-+1/2O_2(g)⇾CO(g). The observed rate against the flow rate of the oxygen gas shows that the oxygen gas supplied is completely consumed in the case of all flow rates. Therefore it may be emphasized that the rate of chemical reaction which may occur on the interface between liquid iron and gas phase is sufficiently rapid to be settled by a supply of reacting species. Furthermore, the constant rate of carbon oxidation observed at high oxygen pressures may be due to the fact that the rate-determining factor exists in the transfer of reactants (carbon) towards the surface where a chemical equilibrium occurs. These experimentsl results may be explained by theoretical considerations carried out on the basis of the diffusion film theory. The total amount of carbon taken away from liquid iron at high oxygen pressures is calculated by 〓=ρ_n/1200 D_cSgm(t-t_0)/⊿l {([C]_<1i>+[C]_<ni>)/2-[C]Ω}, where ρ is the density of liquid iron, D_c the diffusion constant of carbon in liquid iron, ⊿l the thickness of diffusion film, and n, the number of bubbles. [C]_<li> and [C]_<ni> are the respective initial weight % of carbon in the first and n-th bubbles. [C]Ω is the surface % of carbon. Calculated results are qualitatively in agreement with the observed data.
社団法人日本鉄鋼協会の論文
1961-02-01