熔鐵中の FeO の水素による還元平衡

概要

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For the purpose of determining the chemico-thermodynamical values of FeO at a high temperature, which plays the most important role in the chemical reaction of the steelmaking process, a predetermined mixture of steam and hydrogen was passed over the surface of the liquid iron, heated by a high-frequency induction furnace at a temperature between 1, 545-1, 700℃, to establish the equilibrium : - FeO(in Fe(l))+H_2⇌Fe(l)+H_2O(g) And the equilibrium constant K=(P_<H_2O>)/(P_<H_2>FeO%) was measured, where the oxygen content was determined by the hydrogen-reduction method. From the results, the relation between the equilibrium constant and temperature is given as follows : logK=6612/T-3.55……(1) Using the equation (1), the equilibrium constants, determined at each temperature, are corrected to the values at the same temperature of 1, 600℃., which depend only on the temperature and are independent of the amount of FeO in liquid iron : i.e., FeO in this case behaves as an ideal solution. From the equation (1), Fe(l)+1/2O_2=FeO (% in Fe) ΔF°=-29930-2.40T Fe(l)+1/2O_2=FeO(l) ΔF°=-61046+14.85T are given. And the equilibrium constants of the following reaction, FeO(in Fe(l))+CO⇌Fe(l)+CO_2……(2) are expressed as follow : log(P_<CO_2>)/(P_<CO>FeO%)=7978/T-4.88 From the above, equilibrium constants at several temperatures were calculated in oder to compare with the experimental values.
社団法人日本鉄鋼協会の論文
1939-03-25