溶融ウスタイトの CO による還元反応速度

概要

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The reduction rate of liquid wustite contained in an iron crucible under Ar-CO, CO-CO_2 or Ar-CO-CO_2 gas mixtures has been measured by using thermobalance at 1400 and 1450℃. The experimental region of partial pressure of CO was P_<CO>=0.02-0.18 atm (Ar-CO) and P_<CO>=0.07-0.84 atm (Ar-CO-CO_2 and CO-CO_2). The apparent reduction rate became constant in the region of gas flow rate above 2.5 l/min. Under this experimental condition, the rate of reduction was controlled by the chemical reaction at the interface, and was expressed by the following equation : r=k_c(k_e-α)P_<CO> (g-oxygen/cm^2・s), where K_e and α are the equilibrium constant of the reaction among gas, liquid wustite and solid iron, and P_<CO_2>/P_<CO> in the gas phase, respectively. The apparent rate constant of the chemical reaction, k_c, was expressed by the following equation : k_c=1.18exp(-24300/RT)(g-oxygen/cm^2・s・atm). The reduction rate of liquid wustite with CO was 6 times larger than that of solid wustite.
社団法人日本鉄鋼協会の論文
1985-02-01