溶融CaO-SiO2-Al2O3中の酸素ガスの透過度, 拡散係数および溶解度
1978 年 64 巻 9 号 p. 1313-1322
詳細
1978 年 64 巻 9 号 p. 1313-1322
An experimental procedure to determine the permeability of dissolved oxygen gas in liquid slag has been developed using an oxygen concentration cell. A small amount of oxygen gas which permeated the liquid oxide from a pure oxygen compartment to a pure argon compartment was determined by the galvanic cell. The permeabilities of oxygen through CaO-SiO2-Al2O3 melts were found to be in the range of 3×10-19 to 6×10-18 moles / cm. sec. In separate experiments, the oxygen pressure change at the bottom of a column of slag was detected by another galvanic cell. By this method, it is not necessary to quench the specimen to determine the concentration profile of dissolved oxygen to obtain its diffusivity. The diffusion coefficients of oxygen in CaO-SiO2-Al2O3 melts were found to be in the range of 7×10-5 to 3×10-4 cm2/sec. The observed permeabilities and diffusion coefficients increased with increasing temperature at a fixed slag composition and with increasing content of network-modifier oxide at a constant temperature. The solubilities of oxygen gas in CaO-SiO2-Al2O3 melts were estimated from the permiabilities and diffusivities to be 2×10-15 to 2×10-14 moles/cm3.
